Multilayer ceramic capacitor

Patent metadata

Field	Value
Publication number	US-2016189865-A1
Application number	US-201514945388-A
Country	US
Kind code	A1
Filing date	Nov 18, 2015
Priority date	Dec 26, 2014
Publication date	Jun 30, 2016
Grant date	—

Abstract

A multilayer ceramic capacitor has a laminate including dielectric layers laminated alternately with internal electrode layers of different polarities, wherein the dielectric layer contains ceramic grains having Ba, Ti, and X (wherein X represents at least one type of element selected from the group consisting of Mo, Ta, Nb, and W) and a variation in the concentration distribution of X above in the ceramic grain is within ±5%. The multilayer ceramic capacitor can offer excellent service life characteristics even when the thickness of the dielectric layer is 0.8 μm or less, as well as excellent bias characteristics.

First claim

We/I claim:

1 . A multilayer ceramic capacitor having a laminate comprising dielectric layers laminated alternately with internal electrode layers of different polarities, wherein the dielectric layer comprises ceramic grains each containing Ba, Ti, and X (wherein X represents at least one element selected from the group consisting of Mo, Ta, Nb, and W) and a variation in concentration distribution of X in the ceramic grain is within ±5%.

2 . A multilayer ceramic capacitor according to claim 1 , wherein a concentration of X in the dielectric layer is 0.05 to 0.3 mol relative to 100 mol of Ti.

3 . A multilayer ceramic capacitor according to claim 1 , wherein an average grain size of the ceramic grains is 80 to 800 nm.

4 . A multilayer ceramic capacitor according to claim 2 , wherein an average grain size of the ceramic grains is 80 to 800 nm.

5 . A multilayer ceramic capacitor according to claim 1 , wherein the ceramic grain is constituted primarily by barium titanate.

6 . A multilayer ceramic capacitor according to claim 2 , wherein the ceramic grain is constituted primarily by barium titanate.

7 . A multilayer ceramic capacitor according to claim 3 , wherein the ceramic grain is constituted primarily by barium titanate.

8 . A multilayer ceramic capacitor according to claim 4 , wherein the ceramic grain is constituted primarily by barium titanate.

9 . A multilayer ceramic capacitor according to claim 1 , wherein the dielectric layer contains Mo as X above.

10 . A multilayer ceramic capacitor according to claim 2 , wherein the dielectric layer contains Mo as X above.

11 . A multilayer ceramic capacitor according to claim 3 , wherein the dielectric layer contains Mo as X above.

12 . A multilayer ceramic capacitor according to claim 4 , wherein the dielectric layer contains Mo as X above.

13 . A multilayer ceramic capacitor according to claim 5 , wherein the dielectric layer contains Mo as X above.

14 . A multilayer ceramic capacitor according to claim 6 , wherein the dielectric layer contains Mo as X above.

15 . A multilayer ceramic capacitor according to claim 7 , wherein the dielectric layer contains Mo as X above.

16 . A multilayer ceramic capacitor according to claim 8 , wherein the dielectric layer contains Mo as X above.

17 . A multilayer ceramic capacitor according to claim 1 , wherein the dielectric layer has a thickness of 0.8 μm or less.

Assignees

• Taiyo Yuden Kk

Inventors

• Kawamura Chie
• Shimura Tetsuo
• Ryu Minoru
• Morita Koichiro
• Konishi Yukihiro
• Iwazaki Yoshiki

Classifications

• C04B2235/5409

  expressed by specific surface values · CPC title

• C04B2235/3251

  Niobium oxides, niobates, tantalum oxides, tantalates, or oxide-forming salts thereof · CPC title

• C04B35/4682

  based on BaTiO3 perovskite phase · CPC title

• C04B2235/3239

  Vanadium oxides, vanadates or oxide forming salts thereof, e.g. magnesium vanadate · CPC title

• C04B2235/5445

  submicron sized, i.e. from 0,1 to 1 micron · CPC title