KR100435427B1 - Process for producing spherical barium titanate hydroxide fine particles having narrow particle size distribution by using higher alcohol - Google Patents

Process for producing spherical barium titanate hydroxide fine particles having narrow particle size distribution by using higher alcohol Download PDF

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KR100435427B1
KR100435427B1 KR1019960067547A KR19960067547A KR100435427B1 KR 100435427 B1 KR100435427 B1 KR 100435427B1 KR 1019960067547 A KR1019960067547 A KR 1019960067547A KR 19960067547 A KR19960067547 A KR 19960067547A KR 100435427 B1 KR100435427 B1 KR 100435427B1
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fine particles
barium
particle size
methyl ethyl
ethyl ketone
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KR19980048897A (en
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이석근
정두화
조문규
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주식회사 포스코
재단법인 포항산업과학연구원
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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
    • C01P2004/00—Particle morphology
    • C01P2004/01—Particle morphology depicted by an image
    • C01P2004/04—Particle morphology depicted by an image obtained by TEM, STEM, STM or AFM
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/30—Particle morphology extending in three dimensions
    • C01P2004/32—Spheres
    • 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

Abstract

PURPOSE: A process is provided to produce spherical barium titanate hydroxide fine particles having a narrow particle size distribution and a particle size of less then 1 micron by using a higher alcohol solvent. CONSTITUTION: The process comprises the steps of: dissolving 0.01-0.15mol/l of barium-titanium composite alkoxide in the alcohol solvent selected from pentanol, hexanol, heptanol, and octanol; dissolving 0.05-0.35mol/l of water in methyl ethyl ketone; mixing 40-70vol% of the alcohol solution and 30-60vol% of the methyl ethyl ketone solution to produce the barium titanate hydroxide fine particles by hydrolyzing the barium-titanium composite alkoxide.

Description

구상의 수산화바륨티타네이트 미립자의 제조방법Method for producing spherical barium hydroxide titanate fine particles

본 발명은 수산화 바륨티타네이트 미립자의 제조방법에 관한 것으로, 보다 상세하게는 구상이면서 1미크론(㎛)이하의 크기를 갖는 수산화 바륨티타네이트 미립자의 제조방법에 관한 것이다.The present invention relates to a method for producing barium hydroxide titanate fine particles, and more particularly, to a method for producing barium hydroxide titanate fine particles having a size of 1 micron or less.

일반적으로 균일한 미세구조를 갖는 고밀도의 세라믹스 제품을 신뢰성 높고 재현성 좋게 만들기 위해서는, (1) 구상일 것, (2) 입도분포가 좁으면서 입자간 응집이 없는 것 즉, 단분산일 것, (3) 1미크론 이하의 미립자일 것, (4) 조성이 균일하며 고순도일 것 등의 조건을 갖춘 원료 분말이 필요하다. 이와같은 조건의 원료분말을 제조하는 수단으로서, 금속알콕사이드(Alkoxide)를 유기용매중에서 가수분해 시키는 방법이 최근 주목되고 있다. 이 방법은 알콕사이드법 혹은 가수분해 제어법이라고 일컬어지는데, 1968년 스퇴버(Stober)가 에탄올 중에서 암모니아를 촉매로 사용하면서 실리콘 알콕사이드를 가수분해시켜 0.5미크론 정도의 크기를 갖는 구상의 수산화실리콘 미립자를 제조하면서 시작하였다. 그 후 에탄올 용매를 사용하여 수산화티타늄 미립자(일본 공개특허공보 소62-91418호, 평1-33939호)와 수산화 지르코늄 미립자(일본 공개특허공보 소 62-91421호)가 제조되었다.In general, in order to make a high density ceramic product having a uniform microstructure with high reliability and reproducibility, it should be (1) spherical, (2) narrow in particle size distribution, without intergranular aggregation, that is, monodispersion, (3 A raw material powder with conditions such as 1 micron or less, (4) uniform composition and high purity is required. As a means for producing a raw material powder under such conditions, a method of hydrolyzing a metal alkoxide in an organic solvent has recently been noted. This method is called alkoxide method or hydrolysis control method. In 1968, Stover used hydrolysis of silicon alkoxide while using ammonia as a catalyst to produce spherical silicon hydroxide particles having a size of about 0.5 micron. Started. Thereafter, titanium hydroxide fine particles (Japanese Patent Laid-Open No. 62-91418, Japanese Patent No. Hei 1-33939) and zirconium hydroxide fine particles (Japanese Patent Laid-Open No. 62-91421) were produced using an ethanol solvent.

그러나, 상기의 종래방법으로는 구상의 단분산 수산화 바륨티타네이트 입자는 만들어지지 않는다. 그 가장 큰 이유는 출발물질(Precursor)인 바륨과 티타늄의 복합알콕사이드의 가수분해 속도가 매우 빠르기 때문이다. 즉, 종래의 방법에서 사용하고 있는 에탄올 등의 저급알코올 용매로서는 매우 빠른 바륨티타늄 복합 알콕사이드의 가수분해 속도를 적절히 제어할 수 없기 때문에, 구상의 단분산 미립자를 얻을 수 없었다.However, spherical monodisperse barium hydroxide titanate particles are not produced by the above conventional method. The main reason is that the hydrolysis rate of the composite alkoxide of barium and titanium, which is a precursor, is very fast. That is, since the hydrolysis speed of very fast barium titanium composite alkoxide cannot be suitably controlled as a lower alcohol solvent, such as ethanol used by the conventional method, spherical monodisperse fine particles could not be obtained.

이에 본 발명자들은 상기와 같은 문제점을 해결하기 위해 연구와 실험을 거듭하고 그 결과에 근거하여 본 발명을 제안하게 된 것으로, 본 발명은 펜탄올, 헥산올, 헵탄올, 옥탄올로 이루어진 그룹으로부터 선택된 알코올과 메틸에틸케톤을 용매로 이용하고, 바륨과 티타늄의 복합알콕사이드를 가수분해시켜, 구상이면서 입도분포가 좁고 1미크론 이하의 크기를 갖는 수산화 바륨티타네이트 미립자를 제조하는 방법을 제공하고자 하는데, 그 목적이 있다.In order to solve the above problems, the present inventors have repeatedly conducted research and experiments and propose the present invention based on the results, and the present invention is selected from the group consisting of pentanol, hexanol, heptanol, and octanol. By using alcohol and methyl ethyl ketone as a solvent and hydrolyzing the complex alkoxide of barium and titanium, to provide a method for producing barium titanate fine particles having a spherical shape, a narrow particle size distribution and a size of less than 1 micron. There is a purpose.

제 1 도는 본 발명의 방법에 의해 제조된 구상의 수산화 바륨티타네이트 미립자의 투과전자 현미경(TEM)사진이다.1 is a transmission electron microscope (TEM) photograph of spherical barium titanate fine particles produced by the method of the present invention.

제 2 도는 비교 방법에 의해 제조된 응집체형태의 수산화 바륨티타네이트 미립자의 투과전자 현미경(TEM)사진이다.2 is a transmission electron microscope (TEM) photograph of barium titanate fine particles in aggregate form prepared by a comparative method.

상기 목적을 달성하기 위한 본 발명은 펜탄올, 헥산올, 헵탄올, 옥탄올로 이루어진 그룹으로부터 선택된 알코올과 메틸에틸케톤의 혼합 용매중에서 바륨티타늄 복합알콕사이드를 가수분해 시켜 수산화바륨티타네이트 미립자를 제조하는 방법에 있어서, 상기 알코올에 바륨티타늄 복합알콕사이드를0.01-0.15mol/l 용해하여 얻어진 용액 40-70 vol%와, 메틸에틸케톤에 물을 0.05-0.35mol/l 용해하여 얻어진 용액 30-60 vol%를 혼합하여 수산화바륨티타네이트 미립자를 생성시키고, 상기 혼합용액을 교반하면서 생성입자를 성장시키는 과정을 포함하여 구성되는 구상의 수산화바륨티타네이트(BaTi(OH)6) 미립자의 제조방법에 관한 것이다.The present invention for achieving the above object is to produce barium titanate microparticles by hydrolyzing barium titanium composite alkoxide in a mixed solvent of alcohol and methyl ethyl ketone selected from the group consisting of pentanol, hexanol, heptanol, octanol In the method, 40-70 vol% of the solution obtained by dissolving 0.01-0.15 mol / l of barium titanium complex alkoxide in the alcohol, and 30-60 vol% of the solution obtained by dissolving 0.05-0.35 mol / l of water in methyl ethyl ketone. The present invention relates to a method for producing spherical barium hydroxide titanate (BaTi (OH) 6 ) microparticles, which comprises mixing barium hydroxide titanate particles to produce fine particles of barium hydroxide and growing the resulting particles while stirring the mixed solution.

이하, 본 발명을 보다 상세히 설명한다.Hereinafter, the present invention will be described in more detail.

본 발명에서는 우선 바륨티타늄 복합알콕사이드를 알코올에 용해하는데 이때 사용되는 알코올로서는 예를들면 펜탄올, 헥산올, 헵탄올, 옥탄올 등의 고급 알코올이 바람직하며, 상온에서 잘 녹지 않는 경우는 약 50℃ 정도로 가열하면서 교반하면 용이하게 용해시킬 수 있다.In the present invention, first, the barium titanium complex alkoxide is dissolved in alcohol, and as the alcohol used at this time, higher alcohols such as pentanol, hexanol, heptanol, and octanol are preferable, and when it is difficult to dissolve at room temperature, it is about 50 ° C. It can be melt | dissolved easily when stirring, heating to such an extent.

상기 바륨티타늄 복합알콕사이드를 알코올에 용해함에 있어, 그 농도는 0.01-0.15mol/l 로 제어할 필요가 있다. 농도가 0.01mol/l 미만에서는 가수분해 생성물의 농도가 낮아 수산화바륨티타네이트 미립자의 전단계 물질인 핵생성이 일어나지 않으며, 0.15mol/l을 넘으면 오히려 용액중에 과다한 핵이 생성되어 입성장과정에서 서로 달라붙어 응집체가 생성하기 때문이다.In dissolving the barium titanium composite alkoxide in alcohol, its concentration needs to be controlled to 0.01-0.15 mol / l. When the concentration is less than 0.01 mol / l, the concentration of the hydrolyzate is low, so that nucleation, which is a preliminary material of barium hydroxide titanate particles, does not occur. This is because aggregates are formed.

또한, 본 발명에서는 메틸에틸케톤에 물을 용해시킴에 있어, 물의 농도를 0.05-0.35mol/l가 되도록 제어해야 한다. 물의 첨가량이 0.05mol/l 미만에서는 용액중에서 수산화바륨티타네이트의 콜로이드(Colloid)입자가 석출하기 까지 시간이 많이 걸려 실용성이 없으며, 0.35 mol/l 이 넘으면 수산화바륨티타네이트 미립자의 입도분포가 넓게 되어 소위 다분산으로 되거나 구상의 미립자가 아닌 응집체가 생성하기 때문이다.In the present invention, in dissolving water in methyl ethyl ketone, the concentration of water should be controlled to be 0.05-0.35 mol / l. When the amount of water added is less than 0.05 mol / l, it takes a long time to precipitate colloidal particles of barium hydroxide titanate in solution, and if it is more than 0.35 mol / l, the particle size distribution of barium hydroxide titanate becomes wider. This is because aggregates which are not so-called polydispersions or spherical fine particles are formed.

본 발명에서는 알코올 용액과 메틸에틸케톤을 혼합함에 있어, 적절한 혼합비를 갖는다. 즉, 두 용매를 혼합한 후의 부피 양을 100 vol%로 할 때 이중 메틸에틸케톤이 차지하는 부피비가 30-60vol.%가 되도록 할 필요가 있다. 메틸에틸케톤이 차지하는 부피비가 30 vol% 미만 혹은 60 vol%가 넘는 범위에서는 혼합성이 나쁘게 되어 구상의 미립자가 아닌 응집체가 얻어지게 되기 때문이다.In this invention, in mixing an alcohol solution and methyl ethyl ketone, it has a suitable mixing ratio. That is, when the volume amount after mixing two solvents is 100 vol%, the volume ratio of double methyl ethyl ketone needs to be 30-60 vol.%. This is because in the range where the volume ratio of methyl ethyl ketone is less than 30 vol% or more than 60 vol%, the miscibility becomes poor and aggregates are obtained that are not spherical fine particles.

또한, 본 발명에서는 용액의 균일한 혼합과 입성장이 용액 전체에서 균일하게 일어나게 하기 위하여 용액을 교반하는 것이 바람직하다. 교반 방법으로서는, 예를들면, 마그네틴 스터러(Magnetic Stirrer)에 의한 교반, 프로펠라형 교반기에 의한 교반, 초음파를 이용한 교반 등을 들 수 있는데, 특별히 교반 방법이나 장치를 제한하지는 않는다.In addition, in the present invention, it is preferable to stir the solution so that uniform mixing and grain growth of the solution occur uniformly throughout the solution. As the stirring method, for example, stirring with a magnetic stirrer, stirring with a propeller-type stirrer, stirring using ultrasonic waves, etc. are mentioned, but the stirring method and apparatus are not particularly limited.

상기한 바와같이 본 발명에 의하면 일정량의 수산화바륨티타네이트(BaTi(OH)6) 미립자의 핵이 생성한 후에는, 이들을 핵으로 하는 입성장 과정만 진행되어, 즉, 후속적인 핵생성이 억제되기 때문에 단분산성이 높은 수산화바륨티타네이트 미립자가 얻어진다.As described above, according to the present invention, after a certain amount of nuclei of barium hydroxide titanate (BaTi (OH) 6 ) particles are produced, only a particle growth process using these as nuclei proceeds, that is, subsequent nucleation is suppressed. Thus, barium hydroxide titanate particles having high monodispersity are obtained.

본 발명에서의 수산화바륨티타네이트 미립자의 성장속도는 알코올 용액과 메틸에틸케톤 용액 혼합후 약 5분 정도까지는 대단히 빠르지만, 입자의 성장과 함께 완만하게 되는데, 이와같은 입자성장은 혼합 후 약 1시간까지 지속되며 10분 경과 후의 입자크기는 최종 입경의 약 90%에 달한다. 따라서, 입성장 시간을 적당히 선택하는 것에 의해 입경이 다른 수산화바륨티타네이트 입자를 얻을 수 있다. 예를들어, 30분 입성장 시킨 후 얻어진 미립자의 크기는 약 0.28미크론이다.The growth rate of the barium hydroxide titanate fine particles in the present invention is very fast up to about 5 minutes after mixing the alcohol solution and the methyl ethyl ketone solution, but becomes smooth with the growth of the particles, such particle growth is about 1 hour after mixing The particle size after 10 minutes has reached about 90% of the final particle diameter. Therefore, barium hydroxide titanate particles having a different particle diameter can be obtained by appropriately selecting the grain growth time. For example, the particle size obtained after 30 minutes of grain growth is about 0.28 microns.

상기의 제조방법에 의해 얻고자 하는 크기로 성장시킨 수산화바륨티타네이트 미립자를 원심분리에 의해 회수하고, 이를 오븐 및 진공건조기등에서 건조시킴으로써 구상의 수산화바륨티타네이트 미립자를 얻을 수 있다. 생성된 수산화바륨티타네이트 미립자의 입도 분포는 정규분포를 하고 있으며 평균입경의 ±10%이내에 전체입자의 68%이상이 포함되어 단분산성이 매우 높은 미립자가 얻어진다.The spherical barium hydroxide titanate fine particles grown to the size desired by the above production method are recovered by centrifugation, and dried in an oven or a vacuum dryer to obtain spherical barium hydroxide titanate fine particles. The particle size distribution of the produced barium hydroxide titanate particles is normally distributed, and more than 68% of all particles are contained within ± 10% of the average particle diameter, thereby obtaining very high monodispersity fine particles.

이하, 실시예를 통하여 본 발명을 보다 상세하게 설명한다.Hereinafter, the present invention will be described in more detail with reference to Examples.

실시예Example

(실시예 1)(Example 1)

바륨티타늄 복합알콕사이드(0.04mol/l)를 55vol%의 옥탄올에 50℃의 열을 가하면서 용해한 용액에 45vol%의 메틸에틸케톤에 용해한 재증류수(0.2mol/l)를 혼합하여 교반하면서 가수분해를 행하였다. 그 후 상온에서 1시간 입성장시킨 다음 원심분리기로 생성된 미립자와 용매를 분리하고, 분리된 침전물을 200℃의 진공건조기에서 6시간 건조하였다. 이와같이하여 얻어진 수산화바륨티타네이트 미립자의 투과전자현미경(TEM)사진을 제 1 도에 나타내었다. 제 1 도에서 나타낸 바와같이, 얻어진 수산화바륨티타네이트 미립자는 구상이면서 평균 입경 0.3미크론이고 응집이전혀 없는 단분산 미립자임을 알 수 있다.The barium titanium composite alkoxide (0.04 mol / l) was dissolved in 55 vol% of octanol by heating at 50 ° C., and the distilled water (0.2 mol / l) dissolved in 45 vol% of methyl ethyl ketone was mixed and hydrolyzed while stirring. Was performed. After granulation at room temperature for 1 hour, the fine particles and the solvent were separated by a centrifuge, and the separated precipitate was dried for 6 hours in a vacuum dryer at 200 ° C. A transmission electron microscope (TEM) photograph of the barium hydroxide titanate fine particles thus obtained is shown in FIG. As shown in FIG. 1, it can be seen that the obtained barium hydroxide titanate fine particles are spherical, average particle diameter of 0.3 micron, and monodisperse fine particles having no aggregation.

(실시예 2)(Example 2)

바륨티타늄 복합알콕사이드(0.15mol/l)를 65vol%의 옥탄올에 50℃의 열을 가하면서 용해한 용액에, 35vol%의 메틸에틸케톤에 용해한 재증류수(0.35mol/l)를 혼합하여 교반하면서 가수분해를 행하였다. 이때 용액의 혼합은 50℃에서 행하였다. 그 후 상온에서 1시간 입성장시킨 다음 원심분리기로 생성된 미립자와 용매를 분리하고, 분리된 침전물을 200℃의 진공건조기에서 6시간 건조하였다. 본 실시예에서 얻어진 수산화바륨티타네이트 미립자도 실시예 1에서 얻어진 수산화바륨티타네이트 미립자와 같이 구상이면서 평균 입경이 1미크론 이하이고 응집이 전혀 없는 단분산 미립자였다.The barium titanium composite alkoxide (0.15 mol / l) was dissolved in 65 vol% octanol by applying 50 ° C. heat, and distilled water (0.35 mol / l) dissolved in 35 vol% methyl ethyl ketone was mixed and stirred. Decomposition was performed. At this time, the solution was mixed at 50 ° C. After granulation at room temperature for 1 hour, the fine particles and the solvent were separated by a centrifuge, and the separated precipitate was dried for 6 hours in a vacuum dryer at 200 ° C. The barium hydroxide titanate fine particles obtained in this example were also monodisperse fine particles having a spherical shape and an average particle diameter of 1 micron or less and no aggregation at all, like the barium hydroxide titanate fine particles obtained in Example 1.

(비교예 1)(Comparative Example 1)

바륨티타늄 복합알콕사이드(0.3mol/l)를 90vol%의 옥탄올에 50℃의 열을 가하면서 용해한 용액에 10vol.%의 메틸에틸케톤에 용해한 재증류수(0.5mol/l)를 혼합하여 교반하면서 가수분해를 행하였다. 그 후 상온에서 1시간 입성장시킨 다음 원심분리기로 생성된 미립자와 용매를 분리하고, 분리된 침전물을 200℃의 진공건조기에서 6시간 건조하였다. 얻어진 수산화바륨티타네이트 미립자의 투과전자현미경(TEM)사진을 제 2 도에 나타냈다. 제 2 도에 나타낸 바와같이, 본 발명의 범위를 벗어난 조건에서 얻어진 수산화 바륨티타네이트 미립자는 구상의 미립자가 아닌 응집체임을 알 수 있다.The barium titanium composite alkoxide (0.3 mol / l) was dissolved in 90 vol. Octanol with 50 ° C. heat, and distilled water (0.5 mol / l) dissolved in 10 vol.% Methyl ethyl ketone was mixed. Decomposition was performed. After granulation at room temperature for 1 hour, the fine particles and the solvent were separated by a centrifuge, and the separated precipitate was dried for 6 hours in a vacuum dryer at 200 ° C. The transmission electron microscope (TEM) photograph of the obtained barium hydroxide titanate microparticles | fine-particles is shown in FIG. As shown in Fig. 2, it can be seen that the barium hydroxide titanate fine particles obtained under conditions outside the scope of the present invention are aggregates, not spherical fine particles.

상술한 바와같은, 본 발명의 방법에 의하면, 구상이면서 평균입경이 1미크론 이하이고 응집이 없는 구상의 수산화바륨티타네이트 미립자를 얻을 수 있고, 또한 얻어지는 수산화바륨티타네이트 미립자가 균일 입경을 갖는다. 따라서, 세라믹스 소결체의 원료 분말로서 최적이기 때문에 전자재료, 안료, 화장품, 보석, 충진재 등의 여러 가지 용도로도 이용될 수 있는 것이다.According to the method of the present invention as described above, spherical barium hydroxide titanate fine particles having a spherical shape and an average particle diameter of 1 micron or less and no aggregation can be obtained, and the obtained barium hydroxide titanate fine particles have a uniform particle size. Therefore, since it is optimal as a raw material powder of ceramic sintered body, it can be used also for various uses, such as an electronic material, a pigment, cosmetics, jewelry, a filler.

Claims (1)

펜탄올, 헥산올, 헵탄올, 옥탄올로 이루어진 그룹으로부터 선택된 알코올과 메틸에틸케톤의 혼합 용매중에서 바륨티타늄 복합알콕사이드를 가수분해시켜 수산화바륨티타네이트 미립자를 제조하는 방법에 있어서, 상기 알코올에 바륨티타늄 복합알콕사이드를 0.01-0.15mol/l 용해하여 얻어진 용액 40-70vol%와, 메틸에틸케톤에 물을 0.05-0.35mol/l 용해하여 얻어진 용액 30-60vol%를 혼합하여 수산화바륨티타네이트 미립자를 생성시키고, 상기 혼합 용액을 교반하면서 생성입자를 성장시키는 과정을 포함하여 구성되는 것을 특징으로 하는 구상의 수산화바륨티타네이트 미립자의 제조방법.A method for producing barium titanium titanate fine particles by hydrolyzing barium titanium complex alkoxide in a mixed solvent of alcohol and methyl ethyl ketone selected from the group consisting of pentanol, hexanol, heptanol and octanol, wherein the alcohol is barium titanium 40-70 vol% of the solution obtained by dissolving 0.01-0.15 mol / l of the composite alkoxide and 30-60 vol% of the solution obtained by dissolving 0.05-0.35 mol / l of water in methyl ethyl ketone were mixed to form barium hydroxide titanate fine particles. And spherical barium hydroxide titanate fine particles manufacturing method comprising the step of growing the resulting particles while stirring the mixed solution.
KR1019960067547A 1996-12-18 1996-12-18 Process for producing spherical barium titanate hydroxide fine particles having narrow particle size distribution by using higher alcohol KR100435427B1 (en)

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KR100383088B1 (en) * 1998-12-29 2003-07-22 재단법인 포항산업과학연구원 Barium tinate spherical fine particle synthesis method
KR100450223B1 (en) * 2000-08-24 2004-09-24 재단법인 포항산업과학연구원 Preparation method of monosized bariumtitanate particles
KR100732456B1 (en) * 2001-08-31 2007-06-27 주식회사 포스코 Fabrication method of mono-sized bariumtitanate particle
KR100625048B1 (en) * 2004-09-13 2006-09-18 재단법인 포항산업과학연구원 A method for preparing fine particles of monodispersed barium titanate using emulsion

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JPS62265118A (en) * 1986-05-10 1987-11-18 Mitsubishi Mining & Cement Co Ltd Production of precursor sol of barium titanate
US4764493A (en) * 1986-06-16 1988-08-16 Corning Glass Works Method for the production of mono-size powders of barium titanate
JPH01111723A (en) * 1987-10-22 1989-04-28 Mitsui Petrochem Ind Ltd Production of barium titanate
JPH02217318A (en) * 1989-02-16 1990-08-30 Mitsui Petrochem Ind Ltd Production of barium titanate gel and barium titanate

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62265118A (en) * 1986-05-10 1987-11-18 Mitsubishi Mining & Cement Co Ltd Production of precursor sol of barium titanate
US4764493A (en) * 1986-06-16 1988-08-16 Corning Glass Works Method for the production of mono-size powders of barium titanate
JPH01111723A (en) * 1987-10-22 1989-04-28 Mitsui Petrochem Ind Ltd Production of barium titanate
JPH02217318A (en) * 1989-02-16 1990-08-30 Mitsui Petrochem Ind Ltd Production of barium titanate gel and barium titanate

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