# US 2020/0286684 A1 · Manufacturing method of ceramic powder

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- Number: US 2020/0286684 A1
- Document ID: US20200286684A1
- Status: Published application
- Kind: A1
- Application number: 16/882,342
- Filed: 2020-05-22
- Published: 2020-09-10
- Earliest claimed: 2016-06-24
- Assignees: Taiyo Yuden Co., Ltd.
- Applicants: Taiyo Yuden Co., Ltd.
- Inventors: Chie KAWAMURA; Kazumichi HIROI; Osamu HATTORI
- Web page: https://patentgrep.com/patent/US20200286684A1

## CPC

- H01G 4/30: Stacked capacitors (H01G4/33 takes precedence)
- B32B 18/00: Layered products essentially comprising ceramics, e.g. refractory products
- C01G 23/006: {Alkaline earth titanates}
- C04B 35/4682: {based on BaTiO3 perovskite phase}
- C04B 35/62655: {Drying, e.g. freeze-drying, spray-drying, microwave or supercritical drying}
- C04B 35/62685: {characterised by the order of addition of constituents or additives}
- H01G 4/1218: {based on titanium oxides or titanates (H01G4/1245 takes precedence)}
- H01G 4/1227: {based on alkaline earth titanates}
- C01P 2002/34: perovskite-type (ABO3)
- C01P 2002/50: Solid solutions
- C01P 2002/72: by d-values or two theta-values, e.g. as X-ray diagram
- C01P 2002/88: by thermal analysis data, e.g. TGA, DTA, DSC
- C01P 2006/12: Surface area
- C04B 2235/3224: Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
- C04B 2235/3239: Vanadium oxides, vanadates or oxide forming salts thereof, e.g. magnesium vanadate
- C04B 2235/3256: Molybdenum oxides, molybdates or oxide forming salts thereof, e.g. cadmium molybdate
- C04B 2235/3258: Tungsten oxides, tungstates, or oxide-forming salts thereof
- C04B 2235/3262: Manganese oxides, manganates, rhenium oxides or oxide-forming salts thereof, e.g. MnO
- C04B 2235/3267: MnO2
- C04B 2235/3418: Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
- C04B 2235/5296: with a defined aspect ratio, e.g. indicating sphericity
- C04B 2235/5409: expressed by specific surface values
- C04B 2235/663: Oxidative annealing
- C04B 2237/346: Titania or titanates
- C04B 2237/68: Forming laminates or joining articles wherein at least one substrate contains at least two different parts of macro-size, e.g. one ceramic substrate layer containing an embedded conductor or electrode
- H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C01G: COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts or peroxyacids C01B15/00; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium, or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds containing nitrogen, other non-metals and metal C01B21/082}; metal amides C01B21/092; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanamide C01C3/16; thiocyanates C01C3/20)
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

A manufacturing method of ceramic powder includes: synthesizing barium titanate powder from barium carbonate, titanium dioxide, manganese carbonate, and one of ammonium molybdate and tungsten oxide, wherein: a solid solution amount of the donor element is 0.05 mol or more and 0.3 mol or less; a solid solution amount of the accepter element with respect to the barium titanate is 0.02 mol or more and 0.2 mol or less on a presumption that the amount of the barium titanate is 100 mol and the acceptor element is converted into an oxide; and relationships y≥−0.0003x+1.0106, y≤−0.0002x+1.0114, 4≤x≤25 and y≤1.0099 are satisfied when a specific surface area of the ceramic powder is “x” and an axial ratio c/a of the ceramic powder is “y”.

## Claims

### Claim 1

A manufacturing method of ceramic powder comprising:
synthesizing barium titanate powder from barium carbonate, titanium dioxide, manganese carbonate, and one of ammonium molybdate {(NH4)6Mo7O24.4H2O} and tungsten oxide (WO3),
wherein:
a specific surface area of the barium carbonate is 15 m2/g or more before the synthesizing, and a specific surface area of the titanium dioxide is 20 m2/g or more before the synthesizing;
Mo or W acting as a donor element is solid-solved in the barium titanate powder after the synthesizing, and Mn acting as an acceptor element is solid-solved in the barium titanate powder after the synthesizing;
a specific surface are of the barium tianate powder after the synthesizing is 4 m2/g or more 25 m2/g or less;
a transition peak temperature between a tetragonal and a cubic at 120 degrees C. of the barium titanate powder after the synthesizing is shifted toward low temperature side by 1 degrees C. or more, compared to another barium titanate in which none of the donor element and the acceptor element are solid-solved;
a solid solution amount of the donor element with respect to the barium titanate is 0.05 mol or more and 0.3 mol or less on a presumption that an amount of the barium titanate is 100 mol and the donor element is converted into an oxide;
a solid solution amount of the accepter element with respect to the barium titanate is 0.02 mol or more and 0.2 mol or less on a presumption that the amount of the barium titanate is 100 mol and the acceptor element is converted into an oxide; and
relationships y≥−0.0003x+1.0106, y≤−0.0002x+1.0114, 4≤x≤25 and y≤1.0099 are satisfied when a specific surface area of the ceramic powder is “x” and an axial ratio c/a of the ceramic powder is “y”.

### Claim 2 (depends on 1)

The method as claimed in claim 1, wherein the barium titanate powder is synthesized by solid-phase synthesizing.