WO2006041093A1 - 高周波用誘電体セラミックス - Google Patents
高周波用誘電体セラミックス Download PDFInfo
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- WO2006041093A1 WO2006041093A1 PCT/JP2005/018791 JP2005018791W WO2006041093A1 WO 2006041093 A1 WO2006041093 A1 WO 2006041093A1 JP 2005018791 W JP2005018791 W JP 2005018791W WO 2006041093 A1 WO2006041093 A1 WO 2006041093A1
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- wilmite
- titanium oxide
- firing
- rutile
- high frequency
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/12—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances ceramics
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3232—Titanium oxides or titanates, e.g. rutile or anatase
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3284—Zinc oxides, zincates, cadmium oxides, cadmiates, mercury oxides, mercurates or oxide forming salts thereof
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/604—Pressing at temperatures other than sintering temperatures
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/74—Physical characteristics
- C04B2235/77—Density
Definitions
- the present invention relates to a high frequency dielectric ceramic.
- High-frequency dielectric materials are becoming important materials for determining the characteristics of communication circuits due to recent developments in information communication technology.
- Forsterite is known as one of such high-frequency dielectric ceramics. This is a reaction product of MgO and SiO (Mg SiO), which has a relatively good high frequency
- Patent Document 1 a forsterite dielectric material having a low dielectric loss in the microwave region by controlling the impurities and the particle size of the powder in the forsterite manufacturing process.
- acid titanium rutile-type titanium oxide
- Patent Document 1 Japanese Patent No. 3083638
- Patent Document 2 Japanese Patent No. 3083645
- a dielectric material having a low dielectric constant and a high quality factor such as forsterite
- rutile-type titanium oxide is a material with a large temperature coefficient on the positive side. Accordingly, the present inventors have attempted to create a dielectric material having a small absolute value of temperature coefficient by adjusting the amount of rutile-type titanium oxide added to forsterite.
- the present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a novel high-frequency dielectric ceramic having an excellent dielectric characteristic, which is easy to manage the synthesis process. is there.
- Wilmite does not react with moisture in the air or evaporates during firing, so that it is easy to synthesize a compound with a stoichiometric composition.
- Wilmite can be fired at a lower temperature than forsterite.
- the dielectric material that also has the strength of Wilmite alone is from forsterite alone. Therefore, it is suitable as a low dielectric constant material used for a device in which signal delay is a problem.
- Wilmite is a material having a large temperature coefficient on the negative side, and the temperature coefficient can be adjusted to around 0 by adding rutile-type titanium oxide.
- wilmite does not react with rutile-type titanium oxide under firing conditions to produce a by-product. For this reason, it is possible to stably obtain a temperature coefficient corresponding to the addition amount of rutile-type titanium oxide without maintaining delicate firing conditions, and to maintain the excellent high-frequency dielectric properties of Wilmite. Can be easily mass-produced.
- the present invention has been made on the basis of powerful new knowledge.
- the present invention is a high-frequency dielectric ceramic having a main phase of a crystalline phase of Wilmite.
- Another aspect of the present invention is a high-frequency dielectric ceramic containing a Wilmite crystal phase as a main phase and a rutile type titanium oxide crystal phase as a subphase.
- a high-frequency dielectric ceramic having a low dielectric constant and a high quality factor can be provided.
- a high-frequency dielectric ceramic having a low dielectric constant and a high quality factor can be provided.
- wilmite and rutile-type titanium oxide titanium it is possible to provide an excellent dielectric ceramic for high frequency in which the temperature coefficient is controlled close to the absolute value force.
- the dielectric ceramic for high frequency of the present invention can be fired at a relatively low temperature, it can be fired at a low temperature such as an electronic device manufactured by simultaneous firing in which electrodes are formed simultaneously with firing of a substrate. Therefore, it can be expected to be used as a dielectric material that requires
- the Wilmite used in the present invention does not generate by-products during the synthesis process or vaporize components during firing, so that synthesis of a compound having the intended composition is possible. It is easy and suitable for mass production.
- FIG. 1 Process diagram showing an example of a manufacturing process of high frequency dielectric ceramics with a single strength of Wilmite
- FIG. 2 Process diagram showing an example of a manufacturing process for high-frequency dielectric ceramics that contains the crystal phase of wilmite as the main phase and the crystal phase of rutile-type titanium oxide as the sub phase.
- FIG. 3 Graph showing the relationship between firing temperature and relative density in high-frequency dielectric ceramics that also have a single strength of Wilmite
- FIG. 5 Graph showing the relationship between firing temperature and quality factor in high-frequency dielectric ceramics that also have a single strength of Wilmite
- FIG. 7 A graph showing the relationship between firing temperature and apparent density in high-frequency dielectric ceramics that contain the crystal phase of wilmite as the main phase and the crystal phase of rutile-type titanium oxide as the subphase.
- FIG. 8 A graph showing the relationship between firing temperature and relative dielectric constant in high-frequency dielectric ceramics that contain the crystal phase of wilmite as the main phase and the crystal phase of rutile-type titanium oxide as the sub-phase.
- Figure 10 Crystal of Wilmite In a high-frequency dielectric ceramic containing a phase as a main phase and a rutile-type titanium dioxide crystal phase as a subphase, a dull that shows the relationship between the firing temperature and the temperature coefficient.
- FIG. 11 is a graph showing the relationship between the titanium oxide addition rate and the relative dielectric constant in high-frequency dielectric ceramics that contain the crystal phase of wilmite as the main phase and the crystal phase of rutile-type titanium oxide as the subphase.
- FIG. 12 A graph showing the relationship between the titanium oxide addition rate and the quality factor in high frequency dielectric ceramics containing the crystalline phase of wilmite as the main phase and the crystalline phase of rutile-type titanium oxide as the subphase.
- FIG. 13 The relationship between the titanium oxide addition rate and the temperature coefficient in high-frequency dielectric ceramics containing the crystal phase of wilmite as the main phase and the crystal phase of rutile-type titanium oxide as the subphase.
- the dielectric ceramic for high frequency of the present invention has a crystalline phase of Wilmite as a main phase, and the crystalline phase of rutile type titanium oxide, which may be a single strength of the crystalline phase of Wilmite, is a secondary phase. It may be contained as a phase.
- the crystal phase of rutile-type titanium oxide is contained, the content is preferably 7% by weight or more and 14% by weight or less based on the weight of the crystal phase of Wilmite.
- Such a high-frequency dielectric ceramic can be manufactured as follows.
- the particle size is preferably as small as possible, but it is sufficient that the particle size is sufficiently reacted in the pre-baking.
- the pulverization can be performed by a general method using, for example, a ball mill.
- the obtained mixed powder of raw materials is dried and then temporarily fired (temporary firing step).
- the pre-baking may be performed, for example, with a baking temperature of about 1200 ° C. and a baking time of about 3 hours.
- virumite is synthesized.
- the synthesized Wilmite is pulverized and dried again to produce Wilmite powder.
- the pulverization can be performed by a general method using, for example, a ball mill.
- noisya is added to the obtained Wilmite powder and granulated (granulation step).
- organic pastes such as polybulal alcohol and methylcellulose can be preferably used.
- the granulated powder is molded (molding process). For example, after molding by uniaxial pressing at 8 MPa for 2 minutes using a mold with a diameter of 12 mm, it is re-molded by cold isostatic pressing (CIP) at 200 MPa for 2 minutes to form a pellet-shaped molding. It can be done by obtaining.
- CIP cold isostatic pressing
- the degreasing treatment may be performed under the condition that organic substances such as a binder contained in the molded product are gradually burned off.
- the degreasing treatment may be performed at 300 to 500 ° C. for about 4 to 8 hours.
- the main firing is a firing temperature of 1200 ° C or higher 1432 It can be carried out at less than ° C and a firing time of about 2 hours. A firing temperature of less than 1200 ° C is not preferable because sintering does not proceed sufficiently.
- the firing temperature refers to the temperature measured by installing a thermocouple in the heating furnace.
- ⁇ 2 to 3 ° C there is an error of ⁇ 2 to 3 ° C at the center of the heating furnace and about 30 ° C depending on the measurement position throughout the furnace.
- dielectric ceramics for high frequency having a single strength of Wilmite can be obtained.
- FIG. 2 shows a process diagram showing an example of the manufacturing process.
- the process of obtaining the Wilmite powder by performing pre-firing may be performed in the same manner as in the production of the dielectric ceramic for high frequency having the Wilmite simple substance.
- rutile-type titanium oxide powder together with the binder to the obtained Wilmite powder, mix and grind and granulate by spray drying, etc. to obtain a powder (mixing process) granulation process ).
- organic pastes such as polybulal alcohol and methylcellulose can be preferably used.
- a high-purity rutile type titanium oxide titanium Specifically, it is preferable to use one having a purity of 99.5% or more.
- the addition amount of rutile type titanium oxide is preferably 7% by weight or more and 14% by weight or less based on the weight of the Wilmite powder. This is because dielectric ceramics having a small absolute value of temperature coefficient within this range can be obtained.
- the addition rate of rutile-type titanium oxide in this step is the dielectric material finally obtained. It can be considered that it is almost equal to the content of the rutile-type titanium oxide phase in the ceramic mix (percentage by weight relative to the Wilmite crystal phase).
- the obtained granular material is pressure-molded (molding step).
- the molding can be performed, for example, by molding with a uniaxial press and then remolding with a cold isostatic press (CIP).
- CIP cold isostatic press
- the obtained compact is degreased and then fired (main firing step).
- the degreasing and main firing processes are the same as the production of dielectric ceramics for high frequency, which has the above-mentioned Wilmite unit power. The same may be done. Even when rutile-type titanium oxide is added, the firing temperature should be 1200 ° C or higher and lower than 1432 ° C for the same reason as in the case of manufacturing dielectric ceramics for high frequency composed of Wilmite alone. Cost.
- a dielectric ceramic for high frequency containing the crystal phase of wilmite as a main phase and the crystal phase of rutile-type titanium oxide as a sub phase can be obtained.
- the obtained Wilmite powder was added with 1% polybulal alcohol as a binder, mixed, and then molded by uniaxial pressing at 300 kg / cm 3 for 2 minutes to obtain a cylindrical molded product. .
- the molded product was placed in a heating furnace, degreased by heating at 400 ° C for 2 hours, and then heated, and subjected to main firing at 1280 ° C for 2 hours to obtain a cylindrical sintered body .
- a part of the sintered body was polished on both end surfaces to prepare a sample.
- the apparent density was determined by the Archimedes method.
- the relative density was obtained by dividing the obtained apparent density value by the theoretical density.
- the both-end short-circuited dielectric resonator method CliS R 1627 improved from the Hakki and Coleman method.
- the relative dielectric constant ⁇ , the quality factor Q ′ f value, and the temperature coefficient ⁇ were measured.
- the measurement frequency is 14
- the temperature coefficient ⁇ is the resonance frequency f in the temperature range of +20 to + 80 ° C.
- the obtained sintered body was analyzed by a powder X-ray diffraction method (radiation source: CuKa).
- a sintered body was produced and tested in the same manner as in Example 1-1, except that the firing temperature in the main firing was 1300 ° C.
- a sintered body was produced and tested in the same manner as in Example 1-1 except that the firing temperature in the main firing was 1320 ° C.
- a sintered body was produced and tested in the same manner as in Example 1-1 except that the firing temperature in the main firing was 1340 ° C.
- Examples of dielectric ceramics for high frequency use including a crystal phase of wilmite as a main phase and a crystal phase of rutile-type titanium oxide as a sub phase]
- Wilmite powder was prepared in the same manner as in Example 1-1. To the resulting Wilmite powder, 11% by weight of high-purity rutile-type titanium oxide powder was added to the Wilmite powder, and 1% PolyBuur alcohol was added as a binder and mixed. This mixture was pulverized in distilled water for 24 hours with a ball mill using zirconium balls, and then dried at 100 ° C. for 24 hours to obtain a mixed powder.
- the obtained mixed powder was molded in the same manner as in Example 11, and degreased and main-fired to obtain a sintered body.
- the firing temperature for main firing was 1200 ° C.
- a sintered body was produced and tested in the same manner as in Example 2-1, except that the firing temperature in the main firing was 1230 ° C.
- Example 2-3 A sintered body was produced and tested in the same manner as in Example 2-1, except that the firing temperature in the main firing was 1250 ° C.
- a sintered body was produced and tested in the same manner as in Example 2-1, except that the firing temperature in the main firing was 1280 ° C.
- a sintered body was produced and tested in the same manner as in Example 2-1, except that the addition ratio of rutile-type titanium oxide was changed to 5% by weight.
- the firing temperature in the main firing was 1250 ° C.
- a sintered body was produced and tested in the same manner as in Example 3-1, except that the addition ratio of rutile-type titanium oxide was changed to 10% by weight.
- a sintered body was produced and tested in the same manner as in Example 3-1, except that the addition ratio of rutile-type titanium oxide was changed to 15% by weight.
- Table 1 shows the measurement results of the relative density, relative dielectric constant ⁇ r , quality factor Q ′ f and temperature coefficient ⁇ of each sintered body in Examples 11 to 14.
- Figure 3 shows the firing temperature and phase f.
- Fig. 4 is a graph showing the relationship between the firing temperature and the TP relative dielectric constant
- Fig. 5 is a graph showing the relationship between the firing temperature and the quality factor
- Fig. 6 is a graph showing the relationship between the firing temperature and the quality factor. The graphs showing the relationship between the firing temperature and the temperature coefficient are shown respectively.
- the quality factor is about 160,000 to 220,000 GHz, and it was found that dielectric ceramics with a good quality factor can be obtained at a lower firing temperature compared to phonoresterite. In addition, the quality factor increased as the firing temperature increased, but it increased linearly, especially up to 1320 ° C, and then the slope became gentle.
- Examples of high-frequency dielectric ceramics including a wilmite crystal phase as a main phase and a rutile-type titanium oxide crystal phase as a subphase
- Table 2 shows the measurement results of the apparent density, relative dielectric constant ⁇ , quality factor Q′f, and temperature coefficient ⁇ of each sintered body in Examples 2-1 to 2-4.
- Figure 7 shows the firing temperature
- Fig. 8 is a graph showing the relationship between apparent density
- Fig. 8 is a graph showing the relationship between firing temperature and relative dielectric constant
- Fig. 9 is a graph showing the relationship between firing temperature and quality factor
- Fig. 10 is a graph showing the relationship between firing temperature and quality factor. Shows graphs showing the relationship between the firing temperature and the temperature coefficient, respectively.
- the temperature coefficient showed a stable value near 0 at a firing temperature of 1200 to 1280 ° C.
- the fact that the temperature coefficient is relatively wide and stable in the temperature range means that the stability of the crystalline phase of Wilmite and the rutile phase of titanium oxide is good, and does not react with each other during firing. It is thought to be caused by this. This means that it is not necessary to delicately control the firing temperature in the dielectric ceramic manufacturing process, and it can be said that it has characteristics suitable for mass production of Wilmite.
- Table 3 shows the measurement results of the relative dielectric constant ⁇ , the quality factor Q′f, and the temperature coefficient ⁇ of each sintered body in Examples 3-1 to 3-3.
- the results of Example 2-3 (calcination conditions are the same f
- Fig. 11 is a graph showing the relationship between the oxide titanate addition rate and the relative dielectric constant.
- Fig. 12 is a graph showing the relationship between the titanium oxide addition rate and the quality factor. Shows graphs showing the relationship between the titanium oxide addition rate and the temperature coefficient, respectively.
- the quality factor decreased as the amount of titanium oxide added increased. For this reason, it is considered preferable to minimize the amount of titanium oxide added in order to maintain a high quality factor.
- Wilmite does not react with titanium oxide and does not lose the rutile phase, so that the temperature coefficient adjusting effect of titanium oxide can be maximized. Therefore, in dielectric materials that have Wilmite as the main phase and rutile titanium oxide as the subphase, the amount of titanium oxide added can be minimized to obtain the desired temperature coefficient, resulting in high quality. The coefficient can be maintained.
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JP2006540949A JP5134819B2 (ja) | 2004-10-12 | 2005-10-12 | 高周波用誘電体セラミックス |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009221068A (ja) * | 2008-03-18 | 2009-10-01 | Doshisha | Zn2SiO4セラミックス及びその製造方法 |
WO2022255106A1 (ja) * | 2021-05-31 | 2022-12-08 | 豊田合成株式会社 | ミリ波透過ガーニッシュ |
JP7494796B2 (ja) | 2021-05-31 | 2024-06-04 | 豊田合成株式会社 | ミリ波透過ガーニッシュ |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH10324565A (ja) * | 1997-05-26 | 1998-12-08 | Kyocera Corp | 高周波用磁器組成物および高周波用磁器の製造方法 |
JP2001240470A (ja) * | 2000-02-29 | 2001-09-04 | Kyocera Corp | 高周波用磁器組成物および高周波用磁器並びに高周波用磁器の製造方法 |
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DE68913985D1 (de) * | 1988-10-14 | 1994-04-21 | Raychem Corp | Dichter, dielektrischer metalloxidformkörper und -pulver sowie verfahren zu deren herstellung. |
JP3527818B2 (ja) * | 1996-12-27 | 2004-05-17 | 京セラ株式会社 | 低温焼成磁器およびその製造方法 |
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2005
- 2005-10-12 WO PCT/JP2005/018791 patent/WO2006041093A1/ja not_active Application Discontinuation
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JPH10324565A (ja) * | 1997-05-26 | 1998-12-08 | Kyocera Corp | 高周波用磁器組成物および高周波用磁器の製造方法 |
JP2001240470A (ja) * | 2000-02-29 | 2001-09-04 | Kyocera Corp | 高周波用磁器組成物および高周波用磁器並びに高周波用磁器の製造方法 |
Non-Patent Citations (1)
Title |
---|
LEE CC ET AL: "Formation of willemite from powder mixture with TiO2 addition.", JOURNAL OF MATERIALS SCIENCE., vol. 24, no. 9, September 1989 (1989-09-01), pages 3300 - 3304, XP000135333 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009221068A (ja) * | 2008-03-18 | 2009-10-01 | Doshisha | Zn2SiO4セラミックス及びその製造方法 |
WO2022255106A1 (ja) * | 2021-05-31 | 2022-12-08 | 豊田合成株式会社 | ミリ波透過ガーニッシュ |
JP7494796B2 (ja) | 2021-05-31 | 2024-06-04 | 豊田合成株式会社 | ミリ波透過ガーニッシュ |
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JPWO2006041093A1 (ja) | 2008-05-15 |
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