公开(公告)号：US20220037088A1

公开(公告)日：2022-02-03

申请号：US17501817

申请日：2021-10-14

Applicant: TAIYO YUDEN CO., LTD.

Inventor： Chie KAWAMURA ,  Kazumichi HIROI ,  Osamu HATTORI

IPC: H01G4/30 ,  H01G4/12 ,  C04B35/468 ,  B32B18/00 ,  C01G23/00 ,  C04B35/626

Abstract: A manufacturing method of ceramic powder includes mixing a barium carbonate having a specific surface are of 15 m2/g or more, a titanium dioxide having a specific surface area of 20 m2/g or more, a first compound of a donor element having a larger valence than Ti, and a second compound of an acceptor element having a smaller valence than Ti and having a larger ion radium than Ti and the donor element, and synthesizing barium titanate powder by calcining the barium carbonate, the titanium dioxide, the first compound and the second compound until a specific surface area of the barium titanate powder becomes 4 m2/g or more and 25 m2/g or less.

公开(公告)号：US20200286684A1

公开(公告)日：2020-09-10

申请号：US16882342

申请日：2020-05-22

Applicant: TAIYO YUDEN CO., LTD.

Inventor： Chie KAWAMURA ,  Kazumichi HIROI ,  Osamu HATTORI

IPC: H01G4/30 ,  H01G4/12 ,  C04B35/468 ,  B32B18/00 ,  C01G23/00 ,  C04B35/626

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”.

公开(公告)号：US20190043668A1

公开(公告)日：2019-02-07

申请号：US16155623

申请日：2018-10-09

Applicant: TAIYO YUDEN CO., LTD.

Inventor： Chie KAWAMURA ,  Kazumichi HIROI ,  Osamu HATTORI

IPC: H01G4/30 ,  B32B18/00 ,  C04B35/468 ,  H01G4/12 ,  C04B35/626 ,  C01G23/00

Abstract: Ceramic powder includes: barium titanate as a main component, wherein: a donor element having a larger valence than Ti is solid-solved in the barium titanate; an acceptor element having a smaller valence than Ti and larger ion radius than Ti and the donor element is solid-solved in the barium titanate, 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; 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; 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”.

公开(公告)号：US20170372841A1

公开(公告)日：2017-12-28

申请号：US15623253

申请日：2017-06-14

Applicant: TAIYO YUDEN CO., LTD.

Inventor： Chie KAWAMURA ,  Kazumichi HIROI ,  Osamu HATTORI

IPC: H01G4/30 ,  C04B35/468 ,  H01G4/12

CPC classification number: H01G4/30 ,  B32B18/00 ,  C01G23/006 ,  C01P2002/34 ,  C01P2002/50 ,  C01P2002/72 ,  C01P2002/88 ,  C01P2006/12 ,  C04B35/4682 ,  C04B35/62655 ,  C04B35/62685 ,  C04B2235/3224 ,  C04B2235/3239 ,  C04B2235/3256 ,  C04B2235/3258 ,  C04B2235/3262 ,  C04B2235/3267 ,  C04B2235/3418 ,  C04B2235/5296 ,  C04B2235/5409 ,  C04B2235/663 ,  C04B2237/346 ,  C04B2237/68 ,  H01G4/1218 ,  H01G4/1227

Abstract: A multilayer ceramic capacitor includes: a multilayer structure in which ceramic dielectric layers and internal electrode layers are alternately stacked, wherein: a main component of the ceramic dielectric layer is barium titanate in which a donor element having a larger valence than Ti is solid-solved and an acceptor element having a smaller valence than Ti and larger ion radius than Ti and the donor element is solid-solved; a solid-solution amount of the donor element 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; and a solid solution amount of the accepter element 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.