WO2001010781A1 - PROCEDE DE FABRICATION DE POUDRES A BASE DE BaTiO¿3? - Google Patents
PROCEDE DE FABRICATION DE POUDRES A BASE DE BaTiO¿3? Download PDFInfo
- Publication number
- WO2001010781A1 WO2001010781A1 PCT/KR1999/000434 KR9900434W WO0110781A1 WO 2001010781 A1 WO2001010781 A1 WO 2001010781A1 KR 9900434 W KR9900434 W KR 9900434W WO 0110781 A1 WO0110781 A1 WO 0110781A1
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- powder
- bati0
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- solution
- manufacturing
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Classifications
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G23/00—Compounds of titanium
- C01G23/003—Titanates
- C01G23/006—Alkaline earth titanates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/30—Three-dimensional structures
- C01P2002/34—Three-dimensional structures perovskite-type (ABO3)
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/50—Solid solutions
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/76—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by a space-group or by other symmetry indications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/10—Solid density
Definitions
- the present invention relates to a method for manufacturing a BaTi0 3 group powder, and in particular to an easier method for manufacturing BaTi0 3 based powders having high density and controlled stoichiometry than by known method.
- BST Biaxial Ceramic Capacitor
- the BaTi0 3 powder having an average particle size of smaller than 1 ⁇ m is generally manufactured by solution processes.
- a chemical method in which an organic ligand is used it is possible to obtain a high purity BaTi0 3 powder.
- an agglomeration occurs due to a heat treatment which is performed at a temperature of about 1000°C which necessitates an additional grinding process.
- the density of the BaTi0 3 powder manufactured by such method is about 5.5g/cm 3 .
- an ultra-fine BaTi0 3 powder with high purity may be manufactured by hydrolyzing a Ba-Ti alkocide under a C0 2 free environment , or by hydrolyzing a Ti(OR) 4 in a Ba(OH) 2 solution. In this method, an expensive reagent is needed, and the hydrolysis speed, density, etc. may affect the degree of precipitation and it takes a long time.
- German Patent publication DE 3526674 discloses that a hydroxide, a chloride and an alkoxides of Ba and Ti are 5 hydrothermal ly reacted at 5 ⁇ 15atm at a temperature of 150 ⁇ 200°C for thereby manufacturing a BaTi0 3 .
- European patent publication No. EP-A141551 discloses that an orthotitanium acid obtained by a titanium salt (chloride, sulfate) with alkali is hydrothermally reacted with Ba(OH) 2 at a temperature of 60 ⁇ 100°C for thereby manufacturing a BaTi0 3 powder.
- o impurities such as chloride, sulfate, or alkali ions may be contained in the crystal structure, so that it is difficult to manufacture a powder with high purity.
- U.S. Patent No. 4,764,493 discloses that an excessive Ba(OH) 2 and ultra-fine Ti0 2 powder (Anatase>75%) is dispersed into distilled water and is hydrothermally reacted at a temperature of 100 ⁇ 125°C for thereby 5 manufacturing BaTi0 3 powder having a density of 5.7g/cm 3 , and that a Ba(OH) 2 and Ti(0-iPr) 4 or Ti(OEt) 4 are hydrothermally reacted at a boiling point of alcohol for thereby manufacturing a crystalline BaTi0 3 powder having a density higher than 5.7g/cm 3 . According to U.S. Patent No.
- U.S. Patent No. 5,009,876 discloses that BaTi(H 2 C 2 0 4 ) 3 obtained by mixing a mixture of TiOCI 2 and oxalic acid with a BaCI 2 aqueous solution is separated and washed and then is calcined at a temperature of 900 to 1200°C 5 for thereby manufacturing a BaTi0 3 powder.
- U.S. Patent No. 4,670,243 discloses that Ti(Ac) 4 is obtained by adding acetic acid to Ti(0-iPr) 4 and then distilled water is added thereto for thereby manufacturing clear solution and then BaC0 3 , SrC0 3 , CaC0 3 or a mixture of the same is dissolved into the resultant solution, and the resultant solution is o precipitated in a state of pH>13 using a NaOH solution for thereby obtaining Ba (1 . x) Sr x Ti0 3 powder.
- an organic ligand is added to Ba 2+ and Ti 4+ under the state of a mixed solution for thereby manufacturing a Ba-Ti complex compound.
- BaC0 3 an intermediate, is formed, and BaC0 3 is reacted with Ti0 2 on the surface, so that BaTi0 3 is formed.
- a method for manufacturing BaTi0 3 based powders which is formed by doping a precursor of Ti0 2 on the surfaces of a mixture of BaC0 3 and SrC0 3 , forming a fine Ti0 2 in amorphous or anatase form on a BaC0 3 powder surface during a heat treatment process and accelerating a solid solution reaction by diffusion.
- the method includes adding an ammonia solution diluted with distilled water of 40 vol% into an aqueous carbonate slurry comprising BaC0 3 or a mixed powder of BaC0 3 and SrC0 3 of below 10wt%, preferably 1 to 5wt% and distilled water of more than 90 wt% and maintaining the pH of the carbonate slurry in a range of 9.5 to 12.0, preferably, 9.5 to 10.3, obtaining a precipitate by adding a Ti solution into the carbonate slurry containing the ammonia water, filtering and washing the precipitate formed in the carbonate slurry to form a first powder, dispersing the first powder into an alcohol, adding a certain amount of a hydroxypropyl cellulose(HCP), and dehydrating the resultant compound to form a second powder, and heat-treating the second powder at a temperature of 750 to 1150°C, preferably, 900 to 1050°C to form a BaTi0 3 powder or a Ba 07 Sr 03 TiO 3
- the density of Ti + (TiO(OH) 2 ) should be below 1 mmol/ml, preferably, below 0.5 mmol/ml.
- the alcohol which disperses the first powder is selected from the group consisting of ethanol, isopropanol, a compound of ethanol and isopropanol. However, the alcohol is not limited thereto.
- the amount of hydroxypropyl cellulose (HCP) is 0.1 to 5% of the weight amount of the first powder, preferably, 0.2 to 3%.
- the heat treatment is performed until the phase transformation is completed.
- a wet milling process may be further included to increase the fineness of the BaTi0 3 group powder formed by the heat treatment, and the washing is performed using ammonia water until the chloride ions are fully removed from the precipitate.
- the filtering is performed by dispersing the precipitate into the alcohol until the distilled water is fully removed.
- the average fineness of the powder was 0.2 ⁇ m after the calcination process was performed In the case of BaTi0 3 , the average fineness was 0.3 to 0.5 ⁇ m which was below 1 ⁇ m, and thus a uniform particle fineness was implemented.
- BaCO 3 (0.08578mol, Merck Company, German, purity 99.0%) was placed in a polypropylene container together with zirconia balls having a diameter of 5mm and distilled water and was ball-milled for about 4 hours, and the resultant solution was diluted with distilled water so that the concentration of the solution became 2.3wt%. Then 331 ml of distilled water was added to TiCI 4 (0.08571 mol, 7.2025x10 '4 mol/ml, Alfa Product Company, USA, purity 99.0%), the resultant solution was filled into one burette. In another burette, ammonia water(Junsei Company, Japan, purity 28 to 30%) was diluted with distilled water of 40vol%.
- the pH of the aqueous BaC0 3 slurry was maintained at 10.0, and the diluted aqueous TiCI 4 solution was slowly added into the BaC0 3 slurry, and ammonia water was added thereto for thereby forming precipitate of Ti +4 while maintaining the pH at 10.
- the resultant slurry was agitated for 30 minutes, and settled, and then the supernatant was decanted.
- This precipitate was filterde and washed using ammonia water of pH 10.3 until the chloride ions were fully removed. This precipitate was dispersed in isopropanol and then was filtered, so that H 2 0 content was minimized.
- the resultant powder was dispersed into the isopropanol, and a hydroxypropyl cellulose(the average amount of molecules was about 80,000, Aldrich Chemical Company, USA) was added to the resultant powder by 0.2wt%. Thereafter, the resultant solution was filtered and dried. The temperature of the resultant powder was increased by 10°C per minute and then the resultant powder was heat-treated at a temperature of 850°C for 4 hours and at a temperature of 950°C for 2 hours. By XRD, it was determined that the powder had a cubic structure.
- the resultant powder was dispersed in the distilled water, and the concentration was properly adjusted to 0.1g/300ml, and then the resultant solution was ultrasonicated for about 15 minutes and was settled for about 3 minutes.
- the sizes of the particles are shown in Table 1. [Table 1] The average particle size of BaTi0 3 powder versus heat treatment temperature
- BaCO 3 (0.07275mol, purity 99.0%, Merck Company, German,) was placed in a polypropylene container together with zirconia balls having a diameter of 5mm and distilled water and was ball-milled for about 4 hours. The resultant slurry was diluted with distilled water so that the concentration of the slurry became 4.1wt%. Then 200ml of distilled water was added to TiCI 4 (0.0720mol, 7.2025x10 " 4 mol/ml, Alfa Product Company, USA, purity 99.0%), and the resultant solution was filled into one burette. In another burette, ammonia water(Junsei Company, Japan, purity 28 to 30%) was diluted to 60vol% with distilled water.
- the pH of the BaC0 3 slurry was maintained at 10.0, and the diluted aqueous TiCI 4 solution was added to with the aqueous BaC0 3 slurry, and ammonia water was added thereto for thereby forming precipitate of Ti +4 while maintaining the pH at 10.
- the resultant slurry was stirred for 30 minutes, and then settled. This precipitate was filtered and washed using the ammonia water of pH 10.3 until the chloride ions were fully removed. When the chloride ions were removed, the precipitate was dispersed into isopropanol, and precipitate was filtered. In this state, H 2 0 content was minimized. When the H 2 0 was nearly removed, the resultant powder was dispersed in isopropanol.
- a slurry A in which hydroxypropyl cellulose (the average amount of molecules was about 80,000, Aldrich Chemical Company, USA) was contained by 0.2% of the powder weight was prepared, and a slurry B in which hydroxypropyl cellulose was contained by 2.0% of the powder weight was prepared.
- the slurry A and slurry B were dehydrated using a rotary type evaporator for thereby obtaining powders A and B.
- the thusly obtained powders A and B were heat-treated at a temperature of 950°C for 2 hours and were heat- treated at a temperature of 1000°C for 2 hours. As a result of the XRD, it was confirmed that the powders A and B had a cubic structure.
- Powder A heat treated at 1000°C for 2 h showed mole ratio of 1.0079 of Ba /Ti by XRF. And mole ratio of powder A heat treated at 950°C for 2 h was found 1.0073 of Ba Ti by XRF. In order to measure the particle size of the powders, the powders A and
- Example 3 Ti(O(CH 2 ) 2 CH 3 ) 4 (0.10mol, purity 99.0%, Aldrich Chemical Company, USA) was slowly added to isopropanol.
- Formic acid (0.20mol, Junsei Co., Japan, purity 85.0%)was diluted with isopropanol for thereby obtaining a concentration of 16.7wt%.
- the formic acid solution was slowly added to the Ti solution.
- the Ti solution containing the formic acid was refluxed for 2 hours.
- BaCO 3 (0.10mol, purity 99.0%, Merck company, German) was placed in a polypropylene container together with zirconia balls having a diameter of 5mm and distilled water and was ball-milled for about 4 hours, and the resultant slurry was diluted using distilled water so that the concentration of the slurry became 4.0wt%.
- Hydroxypropyl cellulose (the average amount of molecules was about 80,000, Aldrich Chemical Company, USA) was added to the slurry by 0.2wt%.
- the pH of the BaC0 3 slurry was maintained at 9.5 using ammonia diluted to 20vol% with distilled water.
- the formic acid-added Ti solution was added to the slurry with the ammonia for thereby forming precipitates.
- the slurry was agitated for 30 minutes and then settled. Thereafter, the precipitate was filtered and washed, and then was dispersed in isopropanol and was dehydrated using rotary type evaporator for removing the residual water from the slurry.
- the temperature of the thusly- obtained powder was increased by 10°C per minute, and the powder was heat- treated at a temperature of 950°C for 2 hours and at a temperature of 1050°C for 2 hours, respectively.
- XRD XRD
- Aqueous TiCI 4 solution (0.0720mol, 7.2025x10- 4 mol/ml, Alfa Product Company) was diluted with distilled water of 80vol% in a burette.
- Ammonia water (purity 28-30%, Junsei Company, Japan) was diluted to 60vol% with distilled water, and the pH of the BaC0 3 and SrC0 3 slurry was maintained at 10.0, and the diluted TiCI 4 aqueous solution was slowly added to the slurry with the diluted ammonia for thereby forming precipitate. The thusly- obtained slurry was stirred for 30 minutes and then settled. The precipitate was washed using ammonia water of pH 10.3 until the chloride ions were removed. After the chloride ions were fully removed, the precipitate was filtered and washed for thereby obtaining a powder.
- the powder was dispersed into isopropanol, and the precipitate was filtered, and the H 2 0 content was minimized. After the H 2 0 was removed from the powder, the resultant powder was dispersed in the isopropanol. At this time, the powder was divided into two parts. The amount of the alcohol 5 contained in one part(4B) was three times the amount in the other part(4A) of the powder. Then hydroxypropyl cellulose (the average amount of molecules was about 80,000, Aldrich Chemical Company, USA) was added to the isopropanol slurries of the two powders by 0.2wt of the powder. The resultant slurry was dehydrated using a rotary type evaporator for thereby obtaining powders.
- the o powder was heat-treated at a temperature of 950°C and 1000°C for 2 hours, to yield a BST in which the perovskite structure was confirmed at 100% as a result of XRD.
- the powder had a cubic structure.
- the powder was dispersed in distilled water and had a proper 5 concentration of 0.1g/300ml, and the resultant powder was ultrasonicated for about 15 minutes and was set for about 3 minutes. At the first measurement, the average fineness was 0.18 ⁇ m, and at the second measurement, the average fineness was 0.21 ⁇ m.
- BaTi0 3 based powders having a controlled stoichiometric composition having an average particle size of less than 1 ⁇ m by a simple process.
- BaTi0 3 based powders is implemented by a simple process.
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- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
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PCT/KR1999/000434 WO2001010781A1 (fr) | 1999-08-05 | 1999-08-05 | PROCEDE DE FABRICATION DE POUDRES A BASE DE BaTiO¿3? |
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PCT/KR1999/000434 WO2001010781A1 (fr) | 1999-08-05 | 1999-08-05 | PROCEDE DE FABRICATION DE POUDRES A BASE DE BaTiO¿3? |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1415960A2 (fr) | 2002-10-30 | 2004-05-06 | Murata Manufacturing Co., Ltd. | Procédé pour fabrication de matière première céramique diélectrique, une céramique diélectrique et condensateur céramique monolithique |
EP1621519A1 (fr) * | 2004-07-28 | 2006-02-01 | SOLVAY (Société Anonyme) | Noyau de carbonate alcalino terreux dotée d'une couche d'un composé d'un métal de transition appartenant au Groupe IV |
CN101891466A (zh) * | 2010-07-21 | 2010-11-24 | 陕西科技大学 | 一种板状钛酸钡纳米粉体的制备方法 |
CN103848454A (zh) * | 2014-03-28 | 2014-06-11 | 仙桃市展朋新材料有限公司 | 一种纳米级碳酸钡的制备方法 |
US8980130B2 (en) | 2005-10-13 | 2015-03-17 | Rhodia Operations | Submicron rare-earth borates and preparation/luminoshors thereof |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE783723A (fr) * | 1972-05-19 | 1972-09-18 | Fmc Corp | Procede de fabrication de plaques de condensateurs de semi-conducteurs au titanate de baryum |
SU791699A1 (ru) * | 1978-07-06 | 1980-12-30 | Предприятие П/Я А-3481 | Способ получени керамического порошка на основе титаната бари |
JPS59195575A (ja) * | 1983-04-21 | 1984-11-06 | 株式会社村田製作所 | セラミツク原料粉末の製造方法 |
JPS6272525A (ja) * | 1985-09-27 | 1987-04-03 | Fuji Titan Kogyo Kk | チタン酸バリウムまたはチタン酸ストロンチウムの製造法 |
JPH03159903A (ja) * | 1989-11-13 | 1991-07-09 | Nippon Chem Ind Co Ltd | ペロブスカイト系セラミック粉末の製造方法 |
WO1998030498A1 (fr) * | 1997-01-08 | 1998-07-16 | Ferro Corporation | Procede d'obtention de titanate de baryum |
JPH1197279A (ja) * | 1997-09-17 | 1999-04-09 | Matsushita Electric Ind Co Ltd | 耐還元性誘電体組成物の製造方法および積層セラミックコンデンサ |
-
1999
- 1999-08-05 WO PCT/KR1999/000434 patent/WO2001010781A1/fr active IP Right Grant
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE783723A (fr) * | 1972-05-19 | 1972-09-18 | Fmc Corp | Procede de fabrication de plaques de condensateurs de semi-conducteurs au titanate de baryum |
SU791699A1 (ru) * | 1978-07-06 | 1980-12-30 | Предприятие П/Я А-3481 | Способ получени керамического порошка на основе титаната бари |
JPS59195575A (ja) * | 1983-04-21 | 1984-11-06 | 株式会社村田製作所 | セラミツク原料粉末の製造方法 |
JPS6272525A (ja) * | 1985-09-27 | 1987-04-03 | Fuji Titan Kogyo Kk | チタン酸バリウムまたはチタン酸ストロンチウムの製造法 |
JPH03159903A (ja) * | 1989-11-13 | 1991-07-09 | Nippon Chem Ind Co Ltd | ペロブスカイト系セラミック粉末の製造方法 |
WO1998030498A1 (fr) * | 1997-01-08 | 1998-07-16 | Ferro Corporation | Procede d'obtention de titanate de baryum |
JPH1197279A (ja) * | 1997-09-17 | 1999-04-09 | Matsushita Electric Ind Co Ltd | 耐還元性誘電体組成物の製造方法および積層セラミックコンデンサ |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1415960A2 (fr) | 2002-10-30 | 2004-05-06 | Murata Manufacturing Co., Ltd. | Procédé pour fabrication de matière première céramique diélectrique, une céramique diélectrique et condensateur céramique monolithique |
EP1415960A3 (fr) * | 2002-10-30 | 2006-05-10 | Murata Manufacturing Co., Ltd. | Procédé pour fabrication de matière première céramique diélectrique, une céramique diélectrique et condensateur céramique monolithique |
CN100373508C (zh) * | 2002-10-30 | 2008-03-05 | 株式会社村田制作所 | 介电陶瓷用原料粉末的制造方法、介电陶瓷及叠层陶瓷电容器 |
EP1621519A1 (fr) * | 2004-07-28 | 2006-02-01 | SOLVAY (Société Anonyme) | Noyau de carbonate alcalino terreux dotée d'une couche d'un composé d'un métal de transition appartenant au Groupe IV |
WO2006010754A2 (fr) * | 2004-07-28 | 2006-02-02 | Solvay (Société Anonyme) | Poudre de carbonate metallique alcalin-terreux |
WO2006010754A3 (fr) * | 2004-07-28 | 2006-06-08 | Solvay | Poudre de carbonate metallique alcalin-terreux |
JP2008508170A (ja) * | 2004-07-28 | 2008-03-21 | ソルヴェイ(ソシエテ アノニム) | アルカリ土類金属炭酸塩粉末 |
US7662475B2 (en) | 2004-07-28 | 2010-02-16 | Solvay (Société Anonyme) | Alkaline-earth metal carbonate core coated with at least one group IV transition metal compound and method of making thereof |
CN101001813B (zh) * | 2004-07-28 | 2010-09-08 | 索尔维公司 | 涂覆有至少一种ⅳ族过渡金属化合物的碱土金属碳酸盐核 |
US8980130B2 (en) | 2005-10-13 | 2015-03-17 | Rhodia Operations | Submicron rare-earth borates and preparation/luminoshors thereof |
CN101891466A (zh) * | 2010-07-21 | 2010-11-24 | 陕西科技大学 | 一种板状钛酸钡纳米粉体的制备方法 |
CN103848454A (zh) * | 2014-03-28 | 2014-06-11 | 仙桃市展朋新材料有限公司 | 一种纳米级碳酸钡的制备方法 |
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