WO2010008125A1 - 미세 산화세륨 분말 그 제조 방법 및 이를 포함하는 씨엠피슬러리 - Google Patents
미세 산화세륨 분말 그 제조 방법 및 이를 포함하는 씨엠피슬러리 Download PDFInfo
- Publication number
- WO2010008125A1 WO2010008125A1 PCT/KR2009/001370 KR2009001370W WO2010008125A1 WO 2010008125 A1 WO2010008125 A1 WO 2010008125A1 KR 2009001370 W KR2009001370 W KR 2009001370W WO 2010008125 A1 WO2010008125 A1 WO 2010008125A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cerium
- cerium oxide
- oxide powder
- fine
- precursor
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F17/00—Compounds of rare earth metals
- C01F17/10—Preparation or treatment, e.g. separation or purification
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/1454—Abrasive powders, suspensions and pastes for polishing
- C09K3/1463—Aqueous liquid suspensions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F17/00—Compounds of rare earth metals
- C01F17/20—Compounds containing only rare earth metals as the metal element
- C01F17/206—Compounds containing only rare earth metals as the metal element oxide or hydroxide being the only anion
- C01F17/224—Oxides or hydroxides of lanthanides
- C01F17/235—Cerium oxides or hydroxides
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/1454—Abrasive powders, suspensions and pastes for polishing
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/51—Particles with a specific particle size distribution
- C01P2004/52—Particles with a specific particle size distribution highly monodisperse size distribution
-
- 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
- C01P2004/64—Nanometer sized, i.e. from 1-100 nanometer
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
Definitions
- the present invention relates to a method of preparing cerium oxide by forming an intermediate cerium nitrate hydrate by controlling the acidity of a cerium precursor. Specifically, cerium nitrite having an initial grain size finely crystallized by controlling the acidity of a cerium precursor.
- the present invention relates to a fine cerium oxide powder, a method for preparing the same, and a CMP slurry containing the same, because the hydrate is prepared using the intermediate hydrate as an intermediate, and thus the particle size is fine and uniform.
- Cerium oxide powder is a high-performance ceramic powder used as a raw material for abrasives, catalysts, phosphors, and the like, and has recently been widely used as a chemical mechanical abrasive for selective planarization of semiconductor substrates.
- such cerium oxide powder is produced by a gas phase method, a solid phase method and a liquid phase method.
- the gas phase method for preparing cerium oxide powder is a method of directly producing cerium oxide by vaporizing a cerium metal salt precursor and combining it with oxygen, and the like is classified into flame combustion decomposition, gas condensation decomposition, plasma decomposition, and laser vaporization.
- flame combustion decomposition gas condensation decomposition
- plasma decomposition plasma decomposition
- laser vaporization a gas phase method having a problem in that the mass production of cerium oxide is difficult because of the high unit cost and device cost of the cerium metal salt precursor.
- the solid phase method for preparing cerium oxide powder is a method of producing cerium oxide through a calcination process using carbonate, sulfate, oxalate, or the like as a raw material.
- cerium carbonate powder having a large particle size is calcined in an oxygen atmosphere to produce cerium oxide powder having a particle size of 30 to 100 ⁇ m
- the cerium oxide powder Disclosed is a cerium oxide abrasive prepared by dry or wet grinding to control particle size.
- the cerium oxide powder having a large particle size remains, so that it is difficult to control the particle size. Therefore, there is a problem that a long filtration process using a filter must be performed even after the final CMP slurry is prepared.
- the liquid phase method for preparing cerium oxide powder is a method for directly preparing cerium oxide powder by adding a pH adjusting agent such as ammonia from a trivalent or tetravalent cerium salt starting material, which is classified into precipitation method and hydrothermal synthesis method in detail.
- a pH adjusting agent such as ammonia from a trivalent or tetravalent cerium salt starting material
- the unit price and device cost are low, and research and development on this is being actively conducted.
- This liquid phase method is capable of synthesizing relatively fine particles of cerium oxide compared to the solid phase method because particle growth occurs at a small nucleation step, but it is difficult to synthesize particles having high crystallinity, and thus needle-like cerium oxide is synthesized. Therefore, there is a problem that scratches on the surface of the polishing object.
- Korean Unexamined Patent Publication No. 2007-32907 name of the invention: cerium carbonate powder and its preparation method, cerium oxide powder and its preparation method, and CMP slurry comprising the same
- a cerium precursor solution and carbonic acid Disclosed is a cerium carbonate powder, cerium oxide powder prepared therefrom, and a CMP slurry comprising the same, by mixing and precipitating a precursor solution to produce a cerium carbonate powder.
- the cerium oxide produced by using the liquid phase method is composed of relatively fine particles having a particle diameter of about 5 to 10 nm, but it is difficult to improve the crystallinity of the cerium precursor of the cerium precursor solution as an intermediate material, and thus acicular cerium oxide Therefore, the particle size distribution of the cerium oxide powder formed by pulverizing such cerium oxide is not uniform, which adversely affects physical properties, and in the case of producing a CMP slurry using the cerium oxide powder as an abrasive, The scratches are polished on the object to be polished (for example, 15 to 30 scratches are generated on the 30-inch wafer, which is the object to be polished), which leads to deterioration of the quality of electronic products manufactured using the wafer. Has the problem
- an object of the present invention is prepared by using the cerium nitrate hydrate in which the initial particle size is finely crystallized by controlling the acidity of the cerium precursor as an intermediate material, so that the particle size is fine and uniform, so that various polishing functions are greatly improved. It is to provide a cerium oxide powder, a method of manufacturing the same and a CMP slurry containing the same.
- the present invention provides a fine cerium oxide powder produced by the method for producing a fine cerium oxide powder.
- the present invention provides a CMP slurry containing a high-purity cerium oxide powder prepared by the method for producing fine cerium oxide powder.
- the fine cerium oxide powder according to the present invention is prepared by using a cerium nitrate hydrate having a fine initial particle size and homogenized by controlling the acidity of the cerium precursor as an intermediate to form a crystalline particle having a particle diameter of 1 to 2 nm. It has high effect and greatly improves various polishing functions.
- the CMP slurry containing the fine cerium oxide powder of the present invention hardly scratches the surface of the wafer, which is the main polishing target, the CMP slurry has the effect of ensuring the quality of electronic products using such wafers.
- the cerium chloride composition is titrated with sodium hydroxide so as to have a pH of 9 to 10, separated into a primary supernatant and a primary precipitate, and filtered to recover the cerium precursor as the primary precipitate. Steps are included.
- Ceriumite a raw material mineral of cerium, is treated with chlorine gas to form a cerium chloride composition, and the cerium chloride composition is adjusted and purified using a pH adjuster to form cerium precursors, which are intermediates of cerium oxide.
- the cerium chloride composition is titrated with sodium hydroxide as a pH adjuster to form a reaction system.
- sodium hydroxide is titrated so that the acidity of the reaction system is alkalinized to pH 9 to 10
- the cerium chloride composition of the reaction system is precipitated to form a reaction system with the primary supernatant. It is divided into primary sediment.
- the reaction system is controlled with the primary supernatant and the primary by adjusting the exothermic reaction by supplying a small amount of sodium hydroxide to the cerium chloride composition. Separated by sediment.
- the cerium chloride composition is precipitated in the reaction system in which the acidity is adjusted to alkaline by the titration of sodium hydroxide as described above, and is divided into a primary supernatant and a primary precipitate.
- the reaction system in which sodium hydroxide is titrated to the cerium chloride composition is less than pH 9
- the reaction system is not sufficiently classified into the primary supernatant and the primary precipitate, and the acidity of the reaction system in which sodium hydroxide is titrated to the cerium chloride composition is pH. If it exceeds 10, Nd and Sm contained in the cerium chloride composition may not be properly dispersed in the primary supernatant.
- reaction system divided into the primary supernatant and the primary precipitate is filtered to form the cerium precursor by recovering the primary precipitate.
- the method for producing fine cerium oxide powder of the present invention includes titrating nitric acid to the cerium precursor, but titrating nitric acid so that the acidity of the cerium precursor is pH 4 to 4.5 to form cerium nitrate hydrate.
- Nitric acid is mixed with the cerium precursor formed in the formation of the cerium precursor to induce a substitution reaction of the reaction system to form a cerium nitrate hydrate, which is a cerium-derived material, since the cerium precursor is not crystallized properly during the substitution reaction of the reaction system.
- Cerium nitrate hydrate is formed in the form of particles having an initial particle size of about 5 to 10 nm in the form of needles, and cerium oxide formed from the cerium nitrate hydrate is also in the form of needles having an average particle diameter of about 5 to 10 nm. There is a problem that the particle size distribution becomes uneven.
- the present inventors have conducted a number of long-term studies and repeated experiments, and as a result, if the acidity of the reaction system formed by mixing nitric acid with cerium precursor is maintained within a very narrow critical acidity range, It was found that the cerium precursor crystallized properly during the substitution reaction to form cerium nitrate hydrate in the form of particles having an initial particle diameter of 1 to 2 nm.
- cerium nitrate hydrate in the form of particles having an initial particle diameter of 1 to 2 nm is formed from the reaction system, but the acidity of the reaction system is pH 4 to 4.5.
- the critical acidity is outside the critical acidity, cerium nitrate hydrate in the form of particles having an acicular shape with an initial particle diameter of about 5 to 10 nm is formed.
- nitric acid is mixed with the cerium precursor formed in the formation of the cerium precursor to induce a substitution reaction of the reaction system, thereby forming cerium nitrate hydrate, which is a cerium-derived material. Since this occurs badly, a small amount of nitric acid is supplied to the cerium precursor to form a cerium nitrate hydrate which is a cerium-inducing substance while controlling the exothermic reaction.
- the cerium oxide may be formed by applying the liquid phase method to the cerium nitrate hydrate constituted as described above.
- the method of producing a fine cerium oxide powder of the present invention comprises the step of mixing the cerium nitrate hydrate and the aqueous solution of the carbonic acid precursor and precipitation reaction to separate the secondary supernatant and secondary precipitate and to recover the secondary precipitate by filtration. do.
- a predetermined amount of a carbonic acid precursor solution such as an aqueous solution of urea is mixed with cerium nitrate hydrate, which is a cerium-derived substance, and left for a predetermined time to induce a precipitation reaction, which is divided into a secondary supernatant and a secondary precipitate.
- the secondary precipitate is filtered to recover the secondary precipitate.
- a substitution reaction occurs between the cerium nitrate hydrate and the carbonic acid precursor aqueous solution to form a tertiary precipitate which is cerium oxide.
- the formed secondary precipitates have a characteristic of being expressed in the form of crystalline particles having a particle diameter of 1 to 2 nm.
- the method for producing a fine cerium oxide powder of the present invention includes the step of firing and grinding the secondary precipitate at a constant temperature to form a cerium oxide powder.
- Cerium oxide a secondary precipitate formed from cerium nitrate hydrate, is heat-treated at 900 to 1000 ° C. to solidify, and the solidified cerium oxide is pulverized to form cerium oxide powder.
- the heat treatment temperature of the cerium oxide secondary precipitate is less than 900 °C the cerium oxide is not crystallized properly, if the heat treatment temperature of the cerium oxide secondary precipitate is more than 1000 °C the cerium oxide particles strongly bind to the cerium oxide Dispersibility falls.
- the cerium oxide which is a secondary precipitate, has an average particle diameter of 1 to 2 nm, which is much smaller than that of conventional cerium oxide, and is composed of crystalline rather than needle-shaped particles, thereby grinding the cerium oxide powder formed by grinding solidified cerium oxide. Can improve.
- the fine cerium oxide powder prepared by the above-described method for producing cerium oxide powder may not only be formed in the form of crystalline particles having a particle diameter of 1 to 2 nm, but also have a very uniform particle size distribution, thereby greatly improving polishing characteristics.
- the high purity cerium oxide powder is mixed with an abrasive to form a CMP slurry.
- the CMP slurry may also have a finer and more uniform particle size of the cerium oxide powder, which is an abrasive, thereby improving the polishing rate by 30% or more, and hardly scratches occur in the polishing object.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Nanotechnology (AREA)
- Inorganic Chemistry (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Composite Materials (AREA)
- Analytical Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Mechanical Treatment Of Semiconductor (AREA)
Abstract
Description
Claims (3)
- 세륨클로라이드 조성물이 pH 9∼10이 되도록 수산화나트륨을 적정하여 1차 상등액과 1차 침전물로 구분하고 여과하여 상기 1차 침전물인 세륨 전구체를 회수하는 단계; 상기 세륨 전구체에 질산을 적정하되, 세륨 전구체의 산도가 pH 4∼4.5가 되도록 질산을 적정하여 세륨나이트레이트 수화물(Ce(NO3)3·6H2O)을 형성하는 단계; 상기 세륨나이트레이트 수화물과 탄산 전구체 수용액을 혼합하고 침전 반응하여 2차 상등액과 2차 침전물로 구분하고 여과하여 상기 2차 침전물을 회수하는 단계; 및 상기 2차 침전물을 900∼1000 ℃로 소성하고 분쇄하여 입경 1∼2 ㎚의 결정형 입자 형태로 이루어지는 산화세륨 분말을 형성하는 단계를 포함하는 것을 특징으로 하는 미세 산화세륨 분말의 제조 방법.
- 제 1 항의 방법에 의하여 제조되어 입경 1∼2 ㎚의 결정형 입자 형태로 이루어지는 미세 산화세륨 분말.
- 제 1 항의 방법에 의하여 제조되어 입경 1∼2 ㎚의 결정형 입자 형태로 이루어지는 고순도 산화세륨 분말을 포함하는 CMP 슬러리.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/601,630 US20100187470A1 (en) | 2008-07-16 | 2009-03-18 | Fine cerium oxide powder and preparing method the same and cmp slurry comprising the same |
CN200980101121A CN101873998A (zh) | 2008-07-16 | 2009-03-18 | 超细氧化铈粉制备方法及包含其的cmp研磨浆 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020080069155A KR100873945B1 (ko) | 2008-07-16 | 2008-07-16 | 미세 산화세륨 분말 그 제조 방법 및 이를 포함하는 씨엠피슬러리 |
KR10-2008-0069155 | 2008-07-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2010008125A1 true WO2010008125A1 (ko) | 2010-01-21 |
Family
ID=40372589
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/KR2009/001370 WO2010008125A1 (ko) | 2008-07-16 | 2009-03-18 | 미세 산화세륨 분말 그 제조 방법 및 이를 포함하는 씨엠피슬러리 |
Country Status (4)
Country | Link |
---|---|
US (1) | US20100187470A1 (ko) |
KR (1) | KR100873945B1 (ko) |
CN (1) | CN101873998A (ko) |
WO (1) | WO2010008125A1 (ko) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012089516A1 (en) | 2010-12-30 | 2012-07-05 | Basf Se | Surface-modified pigment preparations |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105800665A (zh) * | 2014-12-29 | 2016-07-27 | 安集微电子科技(上海)有限公司 | 一种氧化铈晶体的制备方法及其cmp抛光应用 |
JP6827318B2 (ja) * | 2016-12-28 | 2021-02-10 | 花王株式会社 | 酸化セリウム砥粒 |
KR102484572B1 (ko) * | 2020-08-31 | 2023-01-05 | 솔브레인 주식회사 | 산화 세륨 입자, 이를 포함하는 화학적 기계적 연마 슬러리 조성물 및 반도체 소자의 제조 방법 |
CN117210136B (zh) * | 2023-09-12 | 2024-04-05 | 上海理工大学 | 一种高三价铈离子含量的铈基稀土抛光浆料的制备方法 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH062582B2 (ja) * | 1987-12-02 | 1994-01-12 | 多木化学株式会社 | 結晶質酸化第二セリウムゾル及びその製造法 |
KR20030081942A (ko) * | 2002-04-15 | 2003-10-22 | 주식회사 엘지화학 | 단결정 산화세륨 분말의 제조방법 |
US20070107318A1 (en) * | 2005-11-14 | 2007-05-17 | Oh Myoung H | Cerium carbonate powder, cerium oxide powder, method for preparing the same, and CMP slurry comprising the same |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2545830B1 (fr) * | 1983-05-13 | 1986-01-03 | Rhone Poulenc Spec Chim | Nouvelle composition de polissage a base de cerium et son procede de fabrication |
US5962343A (en) * | 1996-07-30 | 1999-10-05 | Nissan Chemical Industries, Ltd. | Process for producing crystalline ceric oxide particles and abrasive |
CN1282226C (zh) * | 1996-09-30 | 2006-10-25 | 日立化成工业株式会社 | 氧化铈研磨剂以及基板的研磨方法 |
JPH11181403A (ja) * | 1997-12-18 | 1999-07-06 | Hitachi Chem Co Ltd | 酸化セリウム研磨剤及び基板の研磨法 |
US6238450B1 (en) * | 1999-06-16 | 2001-05-29 | Saint-Gobain Industrial Ceramics, Inc. | Ceria powder |
US7025943B2 (en) * | 2002-05-15 | 2006-04-11 | The Curators Of The University Of Missouri | Method for preparation of nanometer cerium-based oxide particles |
CN101039876B (zh) * | 2005-10-14 | 2011-07-27 | Lg化学株式会社 | 用于化学机械抛光的二氧化铈粉末的制备方法及使用该粉末制备化学机械抛光浆料的方法 |
CN101291778B (zh) * | 2005-10-19 | 2012-06-20 | 日立化成工业株式会社 | 氧化铈浆料、氧化铈抛光浆料以及使用其抛光衬底的方法 |
-
2008
- 2008-07-16 KR KR1020080069155A patent/KR100873945B1/ko not_active IP Right Cessation
-
2009
- 2009-03-18 US US12/601,630 patent/US20100187470A1/en not_active Abandoned
- 2009-03-18 WO PCT/KR2009/001370 patent/WO2010008125A1/ko active Application Filing
- 2009-03-18 CN CN200980101121A patent/CN101873998A/zh active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH062582B2 (ja) * | 1987-12-02 | 1994-01-12 | 多木化学株式会社 | 結晶質酸化第二セリウムゾル及びその製造法 |
KR20030081942A (ko) * | 2002-04-15 | 2003-10-22 | 주식회사 엘지화학 | 단결정 산화세륨 분말의 제조방법 |
US20070107318A1 (en) * | 2005-11-14 | 2007-05-17 | Oh Myoung H | Cerium carbonate powder, cerium oxide powder, method for preparing the same, and CMP slurry comprising the same |
Non-Patent Citations (1)
Title |
---|
J. -G. LI ET AL.: "Characterization and sintering of nanocrystalline Ce02 powders synthesized by a mimic alkoxide methods", ACTA MATERIALIA, vol. 49, 2001, pages 419 - 426 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012089516A1 (en) | 2010-12-30 | 2012-07-05 | Basf Se | Surface-modified pigment preparations |
Also Published As
Publication number | Publication date |
---|---|
KR100873945B1 (ko) | 2008-12-12 |
CN101873998A (zh) | 2010-10-27 |
US20100187470A1 (en) | 2010-07-29 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
RU2414427C2 (ru) | Состав для полировки стекла на основе двуокиси церия и процесс для его изготовления | |
KR100812052B1 (ko) | 탄산세륨 분말, 산화세륨 분말, 그 제조방법, 및 이를포함하는 cmp 슬러리 | |
JP5016993B2 (ja) | 酸化マグネシウム粒子凝集体及びその製造方法 | |
JP5069865B2 (ja) | 高純度水酸化マグネシウム粉末及びその製造方法 | |
JP5836472B2 (ja) | 結晶性酸化セリウム及びその製造方法 | |
EP2481709B1 (en) | Method for preparing a cerium carbonate compound and method for preparing cerium oxide | |
WO2011040593A1 (ja) | 分散性に優れる酸化マグネシウム粉末及びその製造方法 | |
KR20060043550A (ko) | α―알루미나 입자의 제조 방법 | |
WO2010008125A1 (ko) | 미세 산화세륨 분말 그 제조 방법 및 이를 포함하는 씨엠피슬러리 | |
DE102006011965A1 (de) | Verfahren zur Herstellung feiner Alpha-Aluminiumoxidteilchen | |
JP4281943B2 (ja) | 板状アルミナ粒子の製造方法 | |
KR101939265B1 (ko) | 베마이트의 제조방법 | |
JPH0137331B2 (ko) | ||
KR102092183B1 (ko) | 고순도 알루미나의 제조방법 | |
JP5274486B2 (ja) | ウレアを用いた炭酸セリウム粉末の製造方法 | |
KR100873940B1 (ko) | 고순도 산화세륨 분말 그 제조 방법 및 이를 포함하는씨엠피 슬러리 | |
EP3248955A1 (en) | Method for producing -eucryptite fine particles | |
CN113388725B (zh) | 退火隔离剂的制备方法以及退火隔离剂和方向性电磁钢板 | |
JP4195931B2 (ja) | スカンジウム化合物超微粒子及びその製造方法 | |
JPS6335571B2 (ko) | ||
JP2843908B2 (ja) | 酸化イットリウム微粉末の製造方法 | |
JPH0431313A (ja) | 微粒子アルミナの製造方法 | |
WO2024101157A1 (ja) | 酸化マグネシウムの製造方法 | |
Sun et al. | Comparative study of synthesis and characterization of YAG: Yb3+ nanoparticles using different precipitator by co-precipitation method | |
JP2023518222A (ja) | 高純度アルミニウム一水和物およびα-アルミナの製造方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 200980101121.2 Country of ref document: CN |
|
WWE | Wipo information: entry into national phase |
Ref document number: 12601630 Country of ref document: US |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 09798028 Country of ref document: EP Kind code of ref document: A1 |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
32PN | Ep: public notification in the ep bulletin as address of the adressee cannot be established |
Free format text: NOTING OF LOSS OF RIGHTS PURSUANT TO RULE 112(1)EPC8EPO FORM 1205A DATED 27-04-2011 ) |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 09798028 Country of ref document: EP Kind code of ref document: A1 |