WO2008102785A9 - 無定形微粒子粉末、その製造方法およびそれを用いたペロブスカイト型チタン酸バリウム粉末 - Google Patents
無定形微粒子粉末、その製造方法およびそれを用いたペロブスカイト型チタン酸バリウム粉末 Download PDFInfo
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Definitions
- the present invention relates to amorphous fine particle powders containing Ba atoms and Ti atoms, which are useful as raw materials for functional ceramics such as piezoelectric materials, optoelectronic materials, dielectric materials, semiconductors, and sensors, a method for producing the same, and perovskites using the same.
- functional ceramics such as piezoelectric materials, optoelectronic materials, dielectric materials, semiconductors, and sensors
- Type barium titanate powder is
- Perovskite barium titanate has been conventionally used as a raw material for functional ceramics such as piezoelectric bodies and multilayer ceramic capacitors.
- functional ceramics such as piezoelectric bodies and multilayer ceramic capacitors.
- multilayer ceramic capacitors have been required to have an increased number of layers and a higher dielectric constant in order to increase the capacity. Therefore, the perovskite-type barium titanate, which is a raw material, is required to be fine, have a molar ratio of Ba to Ti (hereinafter also referred to as “Ba / Ti molar ratio”) of about 1, and have high purity and high crystallinity. It has been.
- barium titanate is produced by a wet method such as a solid phase method, a hydrothermal synthesis method, an oxalate method, or an alkoxide method.
- a wet method such as a solid phase method, a hydrothermal synthesis method, an oxalate method, or an alkoxide method.
- an aqueous solution of TiCl 4 and BaCl 2 is dropped into an aqueous solution of oxalic acid (H 2 C 2 O 4 ) at about 70 ° C. with stirring, and barium oxalate having a Ba / Ti molar ratio of 1 is used.
- a general method is to obtain titanyl and calcine the barium titanyl oxalate.
- the characteristics of this oxalate method are that the composition of the obtained barium titanyl oxalate is uniform and that the target product can be obtained in a stable molar ratio with a good yield. In many cases, the molar ratio (Ba / Ti) is about 1. However, there is a problem that it is difficult to stably obtain a fine material by the oxalate method.
- Patent Document 1 a water-soluble barium salt, a water-soluble titanium salt, and an aqueous solution of oxalic acid are mixed at the same time, and the resulting gel is intensively stirred and crushed in a short time.
- a method of calcining the obtained fine barium titanyl oxalate BaTiO (C 2 O 4 ) 2 .4H 2 O
- the intermediate barium titanyl oxalate is pulverized and then calcined to obtain a fine barium titanate powder, which requires an intermediate pulverization step.
- the present invention is an amorphous material capable of obtaining fine perovskite-type barium titanate powder of stable quality without any residual by-products such as barium carbonate without pulverizing treatment prior to calcination as in the prior art.
- the object is to provide a fine particle powder and a method for producing the same.
- the present invention is to provide a perovskite-type barium titanate powder obtained by using the above amorphous fine particle powder.
- the present inventor has conducted extensive research on a method for producing a perovskite-type barium titanate powder using the oxalate method.
- the present inventors By adding lactic acid to the titanium compound, the present inventors have suppressed the hydrolysis reaction of the titanium compound and the like. It has been found that a stable transparent solution in which can be dissolved can be prepared.
- the first invention to be provided by the present invention is a fine particle powder containing titanium, barium, lactic acid and oxalic acid, having an average particle size of 3 ⁇ m or less and a BET specific surface area of 6 m 2 / g or more,
- the molar ratio of Ba atom to Ti atom (Ba / Ti) is 0.98 to 1.02, and is amorphous in the X-ray diffraction method, and absorbs infrared rays at 1120 to 1140 cm ⁇ 1 and 1040 to 1060 cm ⁇ 1 , respectively. It is an amorphous fine particle powder characterized by having a spectral peak.
- the second invention to be provided by the present invention is that a solution containing a titanium component, a barium component and a lactic acid component (A solution) and a solution containing an oxalic acid component (B solution) are contacted in a solvent containing alcohol. It is the manufacturing method of the amorphous fine particle powder characterized by making it react.
- the third invention to be provided by the present invention is a perovskite-type barium titanate powder obtained by calcining the amorphous fine particle powder of the first invention.
- fine perovskite-type barium titanate powder with stable quality can be obtained without any by-products such as barium carbonate without pulverization before calcination as in the prior art.
- An amorphous fine particle powder and a method for producing the same can be provided.
- the present invention can provide a perovskite-type barium titanate powder obtained using the above amorphous fine particle powder.
- the amorphous fine particle powder of the present invention is a fine particle powder containing titanium, barium, lactic acid and oxalic acid. Specifically, a solution containing a titanium component, a barium component and a lactic acid component is contacted with a solution containing the oxalic acid component. Amorphous fine particle powder produced by reaction and amorphous in X-ray diffraction analysis.
- the amorphous fine particle powder has an average particle size determined by a scanning electron microscope (SEM) of 0.3 ⁇ m or less, preferably 0.1 ⁇ m or less, particularly preferably 0.0001 to 0.1 ⁇ m.
- SEM scanning electron microscope
- the amorphous fine particle powder has a BET specific surface area of 6 m 2 / g or more, preferably 10 m 2 / g or more and 200 m 2 / g or less, particularly preferably 20 m 2 / g or more and 200 m 2 / g or less.
- One of the characteristics is that the powder is finer than barium titanyl powder.
- the amorphous fine particle powder contains Ba atoms and Ti atoms, and the molar ratio of Ba atoms to Ti atoms (Ba / Ti) is 0.98 to 1.02, preferably 0.99 to 1.00. It is also one of the characteristics, and can be suitably used as a raw material for producing perovskite-type barium titanate powders as well as barium titanyl oxalate powders.
- inorganic shaped particles powder are respectively 1120 ⁇ 1140 cm -1 and 1040 ⁇ 1060 cm -1 derived from lactic acid source of the raw material is one also feature has a peak of infrared absorption spectrum, lactic acid in its chemical structure Contains roots.
- the chemical composition of the amorphous fine particle powder is not clear, it is considered to be a complex organic acid salt containing Ba and Ti containing Ba and Ti in the above ranges, and further containing succinate and lactic acid roots in an appropriate blending ratio. .
- perovskite-type barium titanate powder can be easily produced from the amorphous fine particle powder by calcining the amorphous fine particle powder and subjecting it to a deorganic acid treatment as will be described later.
- the amorphous fine particle powder of the present invention has the above-mentioned characteristics and has a chlorine content of 70 ppm or less, preferably 20 ppm or less and substantially does not contain chlorine. This is particularly preferable in terms of ensuring the reliability of the body.
- the amorphous fine particle powder of the present invention may further contain a subcomponent element for the purpose of adjusting the dielectric characteristics and temperature characteristics of the perovskite-type barium titanate powder described later.
- Subcomponent elements that can be used include, for example, Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, rare earth elements, At least one selected from the group consisting of Li, Bi, Zn, Mn, Al, Ca, Sr, Co, Ni, Cr, Fe, Mg, Zr, Hf, V, Nb, Ta, Mo, W, Sn, and Si These elements are mentioned.
- the content of the subcomponent element can be arbitrarily set in accordance with the intended dielectric properties, but the content is preferably in the range of 0.001 to 10% by weight in the perovskite-type barium titanate. desirable.
- the amorphous fine particle powder according to the present invention is reacted by bringing a solution (liquid A) containing a titanium component, a barium component and a lactic acid component into contact with a solution (liquid B) containing an oxalic acid component in a solvent containing alcohol. Can be manufactured.
- titanium chloride, titanium sulfate, titanium alkoxide, or a hydrolyzate of these titanium compounds can be used.
- hydrolyzate of the titanium compound for example, an aqueous solution of titanium chloride, titanium sulfate or the like hydrolyzed with an alkaline solution such as ammonia or sodium hydroxide, or a titanium alkoxide solution hydrolyzed with water is used. be able to.
- titanium alkoxide is particularly preferably used because the by-product is only alcohol and contamination of chlorine and other impurities can be avoided.
- titanium alkoxide to be used examples include titanium methoxide, titanium ethoxide, titanium propoxide, titanium isopropoxide, titanium butoxide and the like.
- titanium butoxide is particularly preferably used from the standpoints of various physical properties such as industrially readily available, good stability of the raw material itself, and easy-to-handle butanol itself.
- this titanium alkoxide can also be used as a solution dissolved in a solvent such as alcohol.
- barium hydroxide for example, barium hydroxide, barium chloride, barium nitrate, barium carbonate, barium acetate, barium lactate, barium alkoxide and the like can be used as the barium source serving as the barium component in the liquid A.
- barium hydroxide is used. It is particularly preferably used because it is inexpensive and can be reacted without mixing of chlorine and other impurities.
- Examples of the lactic acid source to be a lactic acid component in the liquid A include lactic acid, alkali metal lactic acid salts such as sodium lactate and potassium lactate, and ammonium lactate.
- lactic acid is free of by-products and avoids unnecessary impurities. This is particularly preferable.
- titanium lactate such as hydroxybis (lactato) titanium, which is a component source of both the titanium component and the lactic acid component
- the solvent for dissolving the titanium component, barium component and lactic acid component may be water or a mixed solvent of water and alcohol.
- the solution A of the present invention is prepared by performing a first step of preparing a transparent solution containing a titanium source, a lactic acid source and water, and then performing a second step of adding a barium source to the solution.
- a first step of preparing a transparent solution containing a titanium source, a lactic acid source and water and then performing a second step of adding a barium source to the solution.
- the titanium source is added to the aqueous solution in which the lactic acid source is dissolved, the lactic acid source is added to the suspension containing the titanium source and water, or in the case of a liquid titanium compound, the lactic acid source is used as it is. May be added to the titanium compound, and then water may be added to prepare an aqueous solution.
- the addition amount of the lactic acid source in the liquid A is preferably 2 to 10, in terms of molar ratio (lactic acid / Ti) to Ti in the Ti component. Is preferably 4 to 8.
- the reason for this is that when the molar ratio of lactic acid to Ti is less than 2, hydrolysis reaction of the titanium compound tends to occur or it becomes difficult to obtain an aqueous solution in which a stable titanium component is dissolved. Even if it exceeds, the effect is saturated and is not industrially advantageous.
- the temperature at which the lactic acid source is added is not particularly limited as long as it is equal to or higher than the freezing point of the solvent used.
- the blending amount of water in the first step is not particularly limited as long as it is a transparent liquid in which each component is dissolved, but usually 0.05 to 1.7 mol / L as Ti.
- the lactic acid is preferably prepared at 0.1 to 0.7 mol / L and lactic acid at 0.1 to 17 mol / L, preferably 0.4 to 2.8 mol / L.
- the barium source described above in the second step is added to the transparent solution containing the titanium source, lactic acid source and water obtained in the first step.
- the addition amount of the barium source in the liquid A is 0.93 to 1.02, preferably 0.95 to 1.00 in terms of the molar ratio of Ba to Ti (Ba / Ti) in the titanium component in consideration of reaction efficiency. It is preferable that The reason for this is that when the molar ratio of Ba to Ti is less than 0.93, the reaction efficiency decreases, and the (Ba / Ti) of the amorphous fine particle powder obtained tends to be 0.98 or less, while 1.02 is reduced. This is because if it exceeds, (Ba / Ti) of the amorphous fine particle powder tends to be 1.02 or more.
- the temperature at which the barium source is added is not particularly limited as long as it is equal to or higher than the freezing point of the solvent used.
- the concentration of the solution A may be adjusted with water or / and alcohol if necessary.
- the alcohol which can be used can use 1 type (s) or 2 or more types, such as methanol, ethanol, a propanol, isopropanol, a butanol, for example.
- the concentration of each component in the liquid A is 0.05 to 1.7 mol / L, preferably 0.1 to 0.7 mol / L as the titanium component as Ti, and 0.0465 as the barium component as Ba. ⁇ 1.734 mol / L, preferably 0.095 to 0.7 mol / L, and the lactic acid component as lactic acid is 0.1 to 17 mol / L, preferably 0.4 to 5.6 mol / L.
- the liquid A can contain a sub-component element for the purpose of adjusting the dielectric characteristics and temperature characteristics of the perovskite-type barium titanate powder described later.
- Subcomponent elements that can be used include, for example, Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, rare earth elements, At least one selected from the group consisting of Li, Bi, Zn, Mn, Al, Ca, Sr, Co, Ni, Cr, Fe, Mg, Zr, Hf, V, Nb, Ta, Mo, W, Sn, and Si These elements are mentioned.
- the accessory elemental compound is preferably added as an acetate, carbonate, nitrate, lactate or alkoxide.
- the addition amount of the subcomponent element-containing compound can be arbitrarily set in accordance with the intended dielectric properties.For example, the amount added to the element in the subcomponent element-containing compound is added to the perovskite-type barium titanate powder. The amount is 0.001 to 10% by weight.
- the B solution is a solution containing succinic acid, and it is particularly preferable that amorphous B powder having a high BET specific surface area can be obtained by using B solution obtained by dissolving succinic acid with alcohol.
- the alcohol which can be used can use 1 type (s) or 2 or more types, such as methanol, ethanol, a propanol, isopropanol, butanol, for example.
- the solution B preferably has a succinic acid concentration of usually 0.04 to 5.1 mol / L, preferably 0.1 to 2.1 mol / L, because the desired amorphous fine-particle powder can be obtained in a high yield.
- a method of contacting the liquid A and the liquid B in a solvent containing alcohol a method in which the liquid A is added to the liquid B with stirring, or the liquid A and the liquid B are simultaneously stirred in a solution containing alcohol (liquid C). The method of adding below is desirable.
- the method of simultaneously adding the A liquid and the B liquid to the alcohol-containing solution (C liquid) with stirring is particularly preferred in terms of producing a powder having a uniform chemical composition ratio.
- the alcohol that can be used in the liquid C can be one or more of methanol, ethanol, propanol, isopropanol, butanol, etc., but the same alcohol as in the liquid A and liquid B is used. It is preferable to do.
- the amount of the alcohol of the liquid C is not particularly limited.
- the amount of liquid A added to the liquid B, or the amount of liquid A and liquid B added to the liquid C is such that the molar ratio of oxalic acid in the liquid B to the Ti in the liquid A (oxalic acid / Ti) is usually 1.3. It is preferable to add so that it becomes -2.3 because an amorphous fine particle powder can be obtained in a high yield.
- the stirring speed is not particularly limited as long as the slurry containing amorphous fine particles generated from the start of addition to the end of the reaction always exhibits fluidity.
- the contact temperature between the liquid A and the liquid B is not particularly limited as long as it is not higher than the boiling point of the solvent used and not lower than the freezing point.
- the obtained amorphous fine particles have a stable quality with a Ba / Ti molar ratio of about 1 and little variation, and efficiently obtain those within the above range. This is preferable.
- the aging temperature is not particularly limited, but the aging reaction is preferably performed at a temperature of 10 to 50 ° C.
- the aging time may be 3 minutes or longer.
- the aging temperature refers to the temperature of the entire mixture after the contact between the liquid A and the liquid B.
- solid-liquid separation is performed by a conventional method, and if necessary, washing, drying and pulverization are performed to obtain a desired amorphous fine particle powder.
- a cleaning step for cleaning impurities such as chlorine can be omitted.
- the amorphous fine particle powder thus obtained has a Ba / Ti molar ratio of 0.98 to 1.02, preferably 0.99 to 1.00, and a BET specific surface area of 6 m 2 / g or more, preferably 10 m 2 / g. above 200 meters 2 / g or less, are those particularly preferred had 20 m 2 / g or more 200 meters 2 / g or less, 1120 ⁇ 1140 cm -1 and 1040 - the peak of each infrared absorption spectrum 1060 cm -1, also chlorine
- the content is preferably 70 ppm or less, preferably 20 ppm or less.
- the amorphous fine particle powder has an average particle size determined by a scanning electron microscope (SEM) of 0.3 ⁇ m or less, preferably 0.1 ⁇ m or less, particularly preferably 0.0001 to 0.1 ⁇ m.
- SEM scanning electron microscope
- the method for producing a perovskite barium titanate powder according to the present invention is characterized in that the amorphous fine particle powder is calcined.
- the calcination conditions are a calcination temperature of 600 to 950 ° C., preferably 700 to 850 ° C.
- the reason for setting the calcination temperature within the above range is that if it is less than 600 ° C., the formation reaction of the perovskite-type barium titanate powder due to thermal decomposition is not preferable, and if it exceeds 950 ° C.
- the fine perovskite-type barium titanate powder is not preferred because it cannot be obtained.
- the atmosphere of calcination is not particularly limited, and may be any of the atmosphere, reduced pressure, oxygen or inert gas atmosphere. In the present invention, the calcination may be performed as many times as desired. Alternatively, for the purpose of making the powder characteristics uniform, the temporarily calcined material may be pulverized and then re-calcined.
- the perovskite-type barium titanate powder is obtained by appropriately cooling and pulverizing as necessary.
- the pulverization performed as necessary is appropriately performed when the perovskite-type barium titanate powder obtained by calcining is in a brittlely bonded block shape, etc., but the particles of the perovskite-type barium titanate powder itself are It has the following specific average particle diameter and BET specific surface area.
- the obtained perovskite-type barium titanate powder has an average particle size obtained from a scanning electron microscope (SEM) of usually 0.02 to 0.3 ⁇ m, preferably 0.05 to 0.15 ⁇ m, and a BET specific surface area of 6 m. 2 / g or more, preferably 8 to 20 m 2 / g, with little variation in particle size.
- the chlorine content is preferably 20 ppm or less, more preferably 10 ppm or less, and the molar ratio of Ba to Ti is 0.98 to 1.02, preferably 0.99 to 1.00. It is excellent in crystallinity.
- the perovskite-type barium titanate powder according to the present invention is mixed and dispersed in a suitable solvent together with compounding agents such as conventionally known additives, organic binders, plasticizers, and dispersants, for example, in the production of multilayer ceramic capacitors.
- compounding agents such as conventionally known additives, organic binders, plasticizers, and dispersants, for example, in the production of multilayer ceramic capacitors.
- a ceramic sheet used for manufacturing a multilayer ceramic capacitor can be obtained by slurrying and sheet forming.
- a conductive paste for forming an internal electrode is printed on one surface of the ceramic sheet, and after drying, a plurality of the ceramic sheets are laminated and pressure-bonded in the thickness direction. To obtain a laminate. Next, this laminate is heat treated to remove the binder, and fired to obtain a fired body. Furthermore, a multilayer capacitor can be obtained by applying Ni paste, Ag paste, nickel alloy paste, copper paste, copper alloy paste and the like to the sintered body and baking it.
- the perovskite-type barium titanate powder according to the present invention is blended with a resin such as an epoxy resin, a polyester resin, or a polyimide resin to form a resin sheet, a resin film, an adhesive, or the like, a printed wiring board or a multilayer print It can be used as a material such as a wiring board, a co-material for suppressing a shrinkage difference between an internal electrode and a dielectric layer, an electrode ceramic circuit board, a glass ceramic circuit board, and a circuit peripheral material.
- a resin such as an epoxy resin, a polyester resin, or a polyimide resin to form a resin sheet, a resin film, an adhesive, or the like
- a printed wiring board or a multilayer print It can be used as a material such as a wiring board, a co-material for suppressing a shrinkage difference between an internal electrode and a dielectric layer, an electrode ceramic circuit board, a glass ceramic circuit board, and a circuit peripheral material.
- the perovskite-type barium titanate powder obtained in the present invention is suitably used as a catalyst used in reactions such as exhaust gas removal and chemical synthesis, and as a surface modifier for printing toner that imparts antistatic and cleaning effects. Can do.
- Example 1 6.67 g of oxalic acid dihydrate was dissolved in 100 ml of ethanol at 25 ° C. to prepare a solution B.
- FIG. 1 is an X-ray diffraction pattern of the amorphous fine particle powder obtained in Example 1, and the curve is drawn along the horizontal axis.
- the infrared absorption (IR) spectrum of the amorphous fine particle powder is shown in FIG.
- a scanning electron micrograph is shown in FIG.
- the Ba / Ti molar ratio was determined by the fluorescent X-ray method.
- the average particle diameter is arbitrarily determined in the electron microscope observation at 1000 times magnification in Comparative Example 1 from the average value of 200 particles arbitrarily extracted in the electron microscope observation at 70,000 times magnification in Examples 1 and 3. From the average value of 200 particles extracted, in Comparative Example 2, the average value of 200 particles arbitrarily extracted in an optical microscope observation at a magnification of 130 times was obtained.
- Comparative Example 1 6.67 g of oxalic acid dihydrate was dissolved in 100 ml of pure water at 25 ° C. to obtain a solution B. On the other hand, 18.22 g of lactic acid and then 30 g of pure water were added little by little at 25 ° C. with stirring to 8.56 g of tetra-n-butyl titanate to prepare a transparent liquid. Next, 7.75 g of barium hydroxide octahydrate was added and dissolved at 25 ° C., and then diluted with pure water to make 100 ml of solution A.
- the Ba / Ti molar ratio and electron micrograph of this powder were taken in the same manner as in Example 1, and the BET specific surface area, X-ray diffraction, FT-IR, and chlorine content by ion chromatography were measured. It was found to be a crystalline BaTiO (C 2 O 4 ) 2 .4H 2 O (see FIG. 4) and the powder shown in Table 1. The Ba / Ti molar ratio was determined by the fluorescent X-ray method.
- the Ba / Ti molar ratio and optical micrograph of this powder were taken in the same manner as in Example 1, and the BET specific surface area, X-ray diffraction, FT-IR, and chlorine content by ion chromatography were measured. Specifically, it was found to be crystalline (see FIG. 7) BaTiO (C 2 O 4 ) 2 .4H 2 O, and the powder shown in Table 1. The Ba / Ti molar ratio was determined by the fluorescent X-ray method.
- Example 2 5 g of the amorphous fine particle powder obtained in Example 1 was calcined at 800 ° C. for 10 hours in the air atmosphere, cooled, and then crushed in a mortar to obtain barium titanate powder.
- Ba / Ti molar ratio, average particle diameter, BET specific surface area, and lattice constant ratio (C / A) determined by X-ray diffraction of barium titanate obtained by the fluorescent X-ray method, presence of barium carbonate peak around 2 ⁇ 24 ° (See FIG. 11), the chlorine content was measured by ion chromatography.
- Table 2 shows the physical properties of the obtained barium titanate powder.
- the average particle diameter was determined from the average value of 200 particles arbitrarily extracted at a magnification of 50,000 times.
- an electron micrograph is shown in FIG.
- Comparative Example 3 BaTiO obtained in Comparative Example 1 (C 2 O 4) 2 ⁇ 4H 2 O, and calcined for 10 hours in an air atmosphere at 800 ° C. The 5g, after cooling, the barium titanate powder by performing a disintegrated in a mortar Obtained.
- Ba / Ti molar ratio, average particle diameter, BET specific surface area, and lattice constant ratio (C / A) determined by X-ray diffraction of barium titanate obtained by the fluorescent X-ray method, presence of barium carbonate peak around 2 ⁇ 24 ° (See FIG. 11), the chlorine content was measured by ion chromatography.
- Table 2 shows the physical properties of the obtained barium titanate powder. An electron micrograph is shown in FIG.
- Comparative Example 4 BaTiO obtained in Comparative Example 2 (C 2 O 4) 2 ⁇ 4H 2 O, and calcined for 10 hours in an air atmosphere at 800 ° C. The 5g, after cooling, the barium titanate powder by performing a disintegrated in a mortar Obtained.
- Example 3 6.67 g of oxalic acid dihydrate was dissolved in 100 ml of ethanol at 25 ° C. to prepare a solution B. On the other hand, 18.22 g of lactic acid and then 30 g of pure water were added little by little at 25 ° C. with stirring to 8.56 g of tetra-n-butyl titanate to prepare a transparent liquid.
- the Ba / Ti molar ratio and electron micrographs of this powder were taken in the same manner as in Example 1, and the BET specific surface area, X-ray diffraction, FT-IR, chlorine content by ion chromatography, and Mg content were measured. As a result, it was found to be amorphous fine particle powder that was amorphous in X-ray diffraction.
- the molar ratio of Ba / Ti was determined by the fluorescent X-ray method and the Mg content was determined by ICP. Table 3 shows various physical properties of the obtained amorphous fine particle powder.
- Example 4 5 g of amorphous fine particle powder obtained in Example 3 was calcined at 800 ° C. for 10 hours in the air, cooled, and then crushed in a mortar to obtain barium titanate powder containing Mg.
- the amorphous fine particle powder of the present invention can be used for producing fine perovskite-type barium titanate powder with stable quality without any residual by-products such as barium carbonate.
- the perovskite-type barium titanate powder can be used as a raw material for functional ceramics such as piezoelectric bodies and multilayer ceramic capacitors.
- FIG. 2 is an X-ray diffraction pattern of amorphous fine particle powder obtained in Example 1.
- FIG. 2 is a diagram showing an IR spectrum of amorphous fine particle powder obtained in Example 1.
- FIG. 2 is a SEM photograph of amorphous fine particle powder obtained in Example 1.
- 2 is an X-ray diffraction pattern of barium titanyl oxalate powder obtained in Comparative Example 1.
- FIG. 4 is a diagram showing an IR spectrum of barium titanyl oxalate powder obtained in Comparative Example 1.
- FIG. 4 is a SEM photograph of barium titanyl oxalate powder obtained in Comparative Example 1.
- 3 is an X-ray diffraction pattern of barium titanyl oxalate powder obtained in Comparative Example 2.
- FIG. 2 is an X-ray diffraction pattern of amorphous fine particle powder obtained in Example 1.
- FIG. 2 is a diagram showing an IR spectrum of amorphous fine particle powder obtained in Example 1.
- FIG. 6 is a diagram showing an IR spectrum of barium titanyl oxalate powder obtained in Comparative Example 2.
- FIG. 4 is a SEM photograph of barium titanyl oxalate powder obtained in Comparative Example 2.
- 2 is a SEM photograph of barium titanate powder obtained in Example 2.
- 4 is a SEM photograph of barium titanate powder obtained in Comparative Example 3.
- 4 is a SEM photograph of barium titanate powder obtained in Comparative Example 4.
- 4 is a diagram showing an IR spectrum of amorphous fine particle powder obtained in Example 3.
- FIG. 4 is a SEM photograph of barium titanyl oxalate powder obtained in Comparative Example 2.
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Abstract
Description
本発明は、従来の様な仮焼する前の粉砕処理をすることなく、炭酸バリウム等の副生物の残存もなく、安定した品質の微細なペロブスカイト型チタン酸バリウム粉末を得ることができる無定形微粒子粉末及びその製造方法を提供することにある。
本発明の無定形微粒子粉末は、チタン、バリウム、乳酸および蓚酸を含む微粒子粉末であって、具体的にはチタン成分、バリウム成分及び乳酸成分を含む溶液と、蓚酸成分を含む溶液を接触して反応させて生成された無定形微粒子粉末であり、X線回折分析法において非晶質なものである。
用いることができる副成分元素としては、例えば、Sc、Y、La、Ce、Pr、Nd、Pm、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb、Lu、の希土類元素、Li、Bi、Zn、Mn、Al、Ca、Sr、Co、Ni、Cr、Fe、Mg、Zr、Hf、V、Nb、Ta、Mo、W、Sn及びSiからなる群より選ばれる少なくとも1種の元素が挙げられる。副成分元素の含有量は、目的とする誘電特性に合わせて任意に設定することができるが、その含有量はペロブスカイト型チタン酸バリウム中に0.001~10重量%の範囲で含有するのが望ましい。
前記チタン成分、バリウム成分及び乳酸成分を溶解する溶媒は、水、或いは水とアルコールの混合溶媒であってもよい。
A液中の乳酸源の添加量は、Ti成分中のTiに対するモル比(乳酸/Ti)で2~10、好ましくは4~8とすることが好ましい。この理由はTiに対する乳酸のモル比が2未満では、チタン化合物の加水分解反応が起こりやすくなったり、或いは安定なチタン成分を溶解した水溶液を得ることが難しくなり、一方、このモル比が10を超えても効果が飽和し、工業的に有利でないからである。乳酸源を添加する温度は、使用する溶媒の凝固点以上であれば特に限定されない。
A液中のバリウム源の添加量は、反応効率を考慮してチタン成分中のTiに対するBaのモル比(Ba/Ti)で0.93~1.02、好ましくは0.95~1.00とすることが好ましい。この理由はTiに対するBaのモル比が0.93未満では反応効率が低下することから得られる無定形微粒子粉末の(Ba/Ti)が0.98以下になりやすくなり、一方、1.02を超えると無定形微粒子粉末の(Ba/Ti)が1.02以上になりやすくなるからである。バリウム源を添加する温度は使用する溶媒の凝固点以上であれば特に限定されない。
使用できるアルコールは例えばメタノール、エタノール、プロパノール、イソプロパノール、ブタノール等の1種又は2種以上を使用することができる。
A液とB液とのアルコールを含む溶媒中での接触方法としては、A液を攪拌下にB液へ添加する方法、或いはA液とB液をアルコールを含む溶液(C液)に同時に攪拌下に添加する方法が望ましい。
本発明のペロブスカイト型チタン酸バリウム粉末の製造方法は、前記無定形微粒子粉末を仮焼することを特徴とする。
実施例1
蓚酸2水塩6.67gをエタノール100mlに25℃で溶解しB液とした。
この沈殿物を濾過、80℃で乾燥して粉末とした。この粉末の電子顕微鏡写真撮影を行い、Ba/Tiモル比、BET比表面積、X線回折、FT-IR、イオンクロマトグラフィーによる塩素含有量を測定した。その結果、X線回折的に非晶質(図1参照)で表1に示す無定形微粒子粉末であることが判明した。図1は実施例1で得られた無定形微粒子粉末のX線回折図であり、曲線は横軸に沿って描かれている。
なお、Ba/Tiのモル比は蛍光X線法により求めた。
蓚酸2水塩6.67gを純水100mlに25℃で溶解しB液とした。
一方、テトラ-n-ブチルチタネート8.56gに乳酸18.22g、次に純水30gを25℃で攪拌下、少しずつ加えて透明な液を作製した。次に、水酸化バリウム8水塩7.75gを加えて25℃で溶解させた後、純水で希釈して100mlのA液とした。
比較例2
塩化バリウム2水塩600g及び四塩化チタン444gを水4100mlに溶解した混合溶液を調整し、これをA液とした。次に蓚酸2水塩620gを70℃の温水1500mlに溶解し蓚酸水溶液を作製し、これをB液とした。A液にB液を70℃で保持しながら攪拌下に120分かけて添加し、添加終了後、更に70℃で1時間攪拌下に熟成した。冷却後、濾過して沈殿物を回収した。
実施例1と同様にこの粉末のBa/Tiモル比、光学顕微鏡写真撮影を行い、BET比表面積、X線回折、FT-IR、イオンクロマトグラフィーによる塩素含有量、を測定した結果、X線回折的に結晶質(図7参照)のBaTiO(C2O4)2・4H2Oであり、表1に示す粉末であることが判明した。なお、Ba/Tiのモル比は蛍光X線法により求めた。
実施例1で得られた無定形微粒子粉末5gを800℃で10時間大気雰囲気中で仮焼し、冷却後、乳鉢で解砕を行ってチタン酸バリウム粉末を得た。
比較例1で得られたBaTiO(C2O4)2・4H2O、5gを800℃で10時間大気雰囲気中で仮焼し、冷却後、乳鉢で解砕を行ってチタン酸バリウム粉末を得た。
比較例2で得られたBaTiO(C2O4)2・4H2O、5gを800℃で10時間大気雰囲気中で仮焼し、冷却後、乳鉢で解砕を行ってチタン酸バリウム粉末を得た。
蓚酸2水塩6.67gをエタノール100mlに25℃で溶解しB液とした。
一方、テトラ-n-ブチルチタネート8.56gに乳酸18.22g、次いで純水30gを25℃で攪拌下少しずつ加えて透明な液を作製した。引き続き、水酸化バリウム8水塩7.75gを加えて25℃で溶解させた後、エタノールで希釈して100mlのA液とした後、A液に対して酢酸マグネシウムをMgO換算で生成するチタン酸バリウムに対して0.2重量%となるように25℃で溶解させた。攪拌下、エタノール(C液)100mlに対してA液、B液を同時に25℃で5分で全量滴下し、滴下終了後25℃で15分熟成して沈殿物を得た。この沈殿物を濾過、80℃で乾燥して粉末とした。
実施例3で得られた無定形微粒子粉末5gを800℃で10時間大気雰囲気中で仮焼し、冷却後、乳鉢で解砕を行ってMgを含有するチタン酸バリウム粉末を得た。
ことを確認した。
Claims (12)
- チタン、バリウム、乳酸および蓚酸を含む微粒子粉末であって、平均粒径が3μm以下で、BET比表面積が6m2/g以上であり、Ba原子とTi原子のモル比(Ba/Ti)が0.98~1.02であり、かつX線回折法において非晶質で、1120~1140cm-1及び1040~1060cm-1にそれぞれ赤外線吸収スペクトルのピークを有することを特徴とする無定形微粒子粉末。
- 塩素含有量が70ppm以下である請求項1記載の無定形微粒子粉末。
- 更に、希土類元素、Li、Bi、Zn、Mn、Al、Ca、Sr、Co、Ni、Cr、Fe、Mg、Zr、Hf、V、Nb、Ta、Mo、W、Sn及びSiからなる群から選ばれる少なくとも1種を含む請求項1または2記載の無定形微粒子粉末。
- チタン成分、バリウム成分及び乳酸成分を含む溶液(A液)と、蓚酸成分を含む溶液(B液)とをアルコールを含む溶媒中で接触して反応させることを特徴とする無定形微粒子粉末の製造方法。
- 前記A液がチタン源、乳酸源及び水を含む溶液に、バリウム源を添加して調製した溶液である請求項4記載の無定形微粒子粉末の製造方法。
- 前記A液のチタン源がチタンアルコキシドである請求項5記載の無定形微粒子粉末の製造方法。
- 前記A液のバリウム源が水酸化バリウムである請求項5記載の無定形微粒子粉末の製造方法。
- 前記B液が蓚酸とアルコールを含む溶液である請求項5記載の無定形微粒子粉末の製造方法。
- 前記A液とB液をアルコールを含む溶液(C液)に同時に添加して接触させる請求項4記載の無定形微粒子粉末の製造方法。
- 前記A液は、更に、希土類元素、Li、Bi、Zn、Mn、Al、Ca、Sr、Co、Ni、Cr、Fe、Mg、Zr、Hf、V、Nb、Ta、Mo、W、Sn及びSiからなる群から選ばれる少なくとも1種を含有する化合物を含む請求項4乃至9のいずれかの項に記載の無定形微粒子粉末の製造方法。
- 請求項1乃至3のいずれかに記載の無定形微粒子粉末を仮焼して得られたペロブスカイト型チタン酸バリウム粉末。
- 前記仮焼温度が600~950℃である請求項11記載のペロブスカイト型チタン酸バリウム粉末。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112008000453T DE112008000453T5 (de) | 2007-02-20 | 2008-02-19 | Pulver aus amorphen feinen Partikeln, Verfahren zu seiner Herstellung und Bariumtitanat-Pulver des Perowskittyps, das unter seiner Verwendung hergestellt wird |
JP2009500200A JP5270528B2 (ja) | 2007-02-20 | 2008-02-19 | 無定形微粒子粉末、その製造方法およびそれを用いたペロブスカイト型チタン酸バリウム粉末 |
US12/527,936 US20100092375A1 (en) | 2007-02-20 | 2008-02-19 | Amorphous fine-particle powder, method for producing the same and perovskite-type barium titanate powder produced by using the same |
CN2008800056813A CN101675005B (zh) | 2007-02-20 | 2008-02-19 | 无定形微粒粉末、其制造方法和使用其的钙钛矿型钛酸钡粉末 |
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JP2007-040018 | 2007-02-20 | ||
JP2007040018 | 2007-02-20 |
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WO2008102785A1 WO2008102785A1 (ja) | 2008-08-28 |
WO2008102785A9 true WO2008102785A9 (ja) | 2009-09-17 |
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US (1) | US20100092375A1 (ja) |
JP (1) | JP5270528B2 (ja) |
KR (1) | KR20090115732A (ja) |
CN (1) | CN101675005B (ja) |
DE (1) | DE112008000453T5 (ja) |
TW (1) | TW200838805A (ja) |
WO (1) | WO2008102785A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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US20230147982A1 (en) * | 2021-11-11 | 2023-05-11 | Samsung Electro-Mechanics Co., Ltd. | Capacitor component |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2013147107A1 (en) | 2012-03-30 | 2013-10-03 | Canon Kabushiki Kaisha | Piezoelectric ceramic, method for manufacturing piezoelectric ceramic, piezoelectric element, and electronic device |
JP5552603B2 (ja) * | 2012-05-11 | 2014-07-16 | 学校法人東京理科大学 | 多結晶チタン酸バリウム粒子の製造方法 |
JP6599717B2 (ja) * | 2015-10-05 | 2019-10-30 | 株式会社ノリタケカンパニーリミテド | チタン酸バリウム微粒子とその分散体 |
US11472716B2 (en) | 2016-06-14 | 2022-10-18 | Denka Company Limited | High-purity barium titanate powder, method for producing same, resin composition, and fingerprint sensor |
JP6286108B1 (ja) * | 2017-03-06 | 2018-02-28 | 日本碍子株式会社 | セキュリティインク顔料、セキュリティインク、印刷物およびセキュリティインク顔料を生産する方法 |
JP6573653B2 (ja) * | 2017-12-07 | 2019-09-11 | 日本化学工業株式会社 | ペロブスカイト型チタン酸バリウム粉末の製造方法 |
JP2021034631A (ja) * | 2019-08-28 | 2021-03-01 | 株式会社村田製作所 | 積層型電子部品および積層型電子部品の製造方法 |
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JPS61146710A (ja) | 1984-12-19 | 1986-07-04 | Central Glass Co Ltd | 高純度チタン酸バリウム微粒子の製造方法 |
JPH01294527A (ja) * | 1988-05-20 | 1989-11-28 | Mitsubishi Petrochem Co Ltd | Abo↓3型ペロブスカイト型金属酸化物の製造方法 |
JPH0259426A (ja) * | 1988-08-26 | 1990-02-28 | Toho Titanium Co Ltd | 結晶性チタン酸バリウム超微粒子の製造方法 |
JP3780405B2 (ja) * | 2000-08-11 | 2006-05-31 | 株式会社村田製作所 | 微粒チタン酸バリウム粉末、カルシウム変性微粒チタン酸バリウム粉末、ならびにその製造方法 |
CN1172874C (zh) * | 2002-07-10 | 2004-10-27 | 清华大学 | 制备四方相钛酸钡纳米粉体的方法 |
JP4759211B2 (ja) | 2002-10-01 | 2011-08-31 | 日本化学工業株式会社 | ペロブスカイト型チタン酸バリウム粉末の製造方法 |
KR101136665B1 (ko) * | 2004-03-29 | 2012-04-18 | 니폰 가가쿠 고교 가부시키가이샤 | 복합 유전체 재료 |
EP1879833A4 (en) * | 2005-05-02 | 2009-09-30 | Symyx Technologies Inc | HIGH SURFACE METAL, METAL OXIDE MATERIALS AND METHOD OF MANUFACTURING THEREOF |
US7993611B2 (en) * | 2006-08-02 | 2011-08-09 | Eestor, Inc. | Method of preparing ceramic powders using ammonium oxalate |
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- 2008-01-23 TW TW097102454A patent/TW200838805A/zh unknown
- 2008-02-19 CN CN2008800056813A patent/CN101675005B/zh not_active Expired - Fee Related
- 2008-02-19 WO PCT/JP2008/052783 patent/WO2008102785A1/ja active Application Filing
- 2008-02-19 US US12/527,936 patent/US20100092375A1/en not_active Abandoned
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- 2008-02-19 DE DE112008000453T patent/DE112008000453T5/de not_active Withdrawn
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US20230147982A1 (en) * | 2021-11-11 | 2023-05-11 | Samsung Electro-Mechanics Co., Ltd. | Capacitor component |
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US20100092375A1 (en) | 2010-04-15 |
KR20090115732A (ko) | 2009-11-05 |
DE112008000453T5 (de) | 2010-05-27 |
JPWO2008102785A1 (ja) | 2010-05-27 |
CN101675005B (zh) | 2011-08-31 |
JP5270528B2 (ja) | 2013-08-21 |
WO2008102785A1 (ja) | 2008-08-28 |
TW200838805A (en) | 2008-10-01 |
CN101675005A (zh) | 2010-03-17 |
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