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Microstructure Evolution and Dielectric Properties of Ultrafine Grained BaTiO 3 ‐Based Ceramics by Two‐Step Sintering
Author(s) -
Tian Zhibin,
Wang Xiaohui,
Lee Seungju,
Hur Kang Heon,
Li Longtu
Publication year - 2011
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2010.04234.x
Subject(s) - ceramic capacitor , materials science , microstructure , sintering , dielectric , ceramic , grain size , capacitance , composite material , capacitor , electroceramics , electrode , metallurgy , voltage , fabrication , optoelectronics , electrical engineering , medicine , microfabrication , chemistry , alternative medicine , pathology , engineering
The base‐metal electrode multilayer ceramic capacitors for future application require much thinner dielectric layers (<1 μm). Therefore, the grain size and uniformity of dielectric ceramics should be effectively controlled. In this paper, a two‐step sintering (TSS) method has been utilized to prepare the ultrafine‐grained X7R BaTiO 3 ceramics in reducing atmosphere with the average grain size below 200 nm. And the influence of TSS schedule on the microstructure (such as bulk density, grain size) and dielectric properties is discussed in detail. Furthermore, the development of core–shell structure and corresponding temperature coefficient of capacitance characteristics during the intermediate stage of TSS process has been systematically investigated.