Dielectric ceramic composition and multilayer ceramic electronic component

Patent metadata

Field	Value
Publication number	US-11072564-B2
Application number	US-201916511286-A
Country	US
Kind code	B2
Filing date	Jul 15, 2019
Priority date	Jul 31, 2018
Publication date	Jul 27, 2021
Grant date	Jul 27, 2021

Abstract

A dielectric ceramic composition having improved insulation specific resistance and a highly accelerated lifetime. The dielectric ceramic composition includes a dielectric particle having a core-shell structure including a main component expressed by a general formula ABO 3 , where A is Ba and the like, and B is Ti and the like), and a rare earth element component R, in which a shell part of the core-shell structure has an average rare earth element concentration C of 0.3 atom % or more. The rare earth element has a specified concentration gradient or concentration variation.

First claim

What is claimed is:

1. A dielectric ceramic composition comprising comprising:
a dielectric particle having a core-shell structure including a main component expressed by a general formula ABO 3 , where A is at least one selected from the group consisting of Ba, Sr, and Ca, and B is at least one selected from the group consisting of Ti, Zr, and Hf; and
a rare earth element component R, where R is at least one selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu,
wherein a core part of the core-shell structure consists essentially of the main component,
a shell part of the core-shell structure has an average rare earth element concentration C of 0.3 atom % or more, and
a rare earth element concentration gradient S is −0.006 atom %/nm≤S≤0.006 atom %/nm which is calculated from a rare earth element concentration at 10 nm towards inner side from an outermost surface of the dielectric particle and a rare earth element concentration at 10 nm towards a shell side from a core-shell interface of the dielectric particle.

2. The dielectric ceramic composition according to claim 1 , wherein an average particle size of the dielectric particle is 0.16 to 0.26 μm.

Assignees

• Tdk Corp

Inventors

• Ariizumi Takuma
• Kaneko Toshihiko
• Morigasaki Nobuto
• Ito Yasuhiro

Classifications

• H01G4/1209

  characterised by the ceramic dielectric material (H01G4/1272, H01G4/1281 take precedence) · CPC title

• C04B35/4682 Primary

  based on BaTiO3 perovskite phase · CPC title

• H01G4/005

  Electrodes · CPC title

• C04B2235/3418

  Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint · CPC title

• C04B2235/6565

  Cooling rate · CPC title