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Microstructure and Dielectric Properties of Barium Strontium Titanate Thick Films and Ceramics With a Concrete‐Like Structure
Author(s) -
Zhang Hongfang,
Yao Xi,
Zhang Liangying
Publication year - 2007
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.1551-2916.2007.01742.x
Subject(s) - materials science , dielectric , ceramic , microstructure , composite material , dissipation factor , sintering , sol gel , dielectric loss , electroceramics , barium titanate , mineralogy , nanotechnology , optoelectronics , fabrication , medicine , microfabrication , chemistry , alternative medicine , pathology
Barium strontium titanate (Ba 0.6 Sr 0.4 TiO 3 , BST) thick films and ceramics with a concrete‐like structure were fabricated by a novel sol–gel‐based route. In this process, well‐crystallized nano‐sized or micrometer‐sized BST powders or their combinations are dispersed into a sol–gel matrix. Crack‐free thick films and dense BST ceramics have been fabricated at a low sintering temperature with a very inhomogeneous concrete‐like structure. The dielectric properties of such thick films and ceramics have been investigated. The results show that the dielectric constant and loss tangent of the thick films are 1209 and 0.016, respectively, at 0°C, 10 kHz, and those of the bulk BST ceramics are 5510 and 0.02, respectively, at 0°C, 10 kHz.