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Dielectric Properties of Fluxed Barium Titanate Ceramics with Zirconia Additions
Author(s) -
Armstrong Timothy R.,
Young Karrie A.,
Buchanan Relva C.
Publication year - 1990
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.1151-2916.1990.tb06575.x
Subject(s) - materials science , barium titanate , microcrystalline , grain size , grain boundary , dielectric , phase (matter) , grain growth , mineralogy , ceramic , analytical chemistry (journal) , composite material , microstructure , crystallography , chemistry , optoelectronics , organic chemistry , chromatography
BaTiO 3 compacts, when fluxed with <2 vol% of a complex borate glass phase, were sintered to near theoretical density at temperatures <1175°C in 2 h. Microstructural analysis showed a uniform grain size <1.0 μm with 0.75 wt% ZrO 2 added to the flux phase as a grain growth inhibitor. TEM analysis revealed a microcrystalline grain‐boundary phase with the ZrO 2 resident along the grain boundaries. These samples displayed an essentially flat dielectric profile, low dissipation factors (<2%) over the range 25° to 125°C, a near linear dependence (≅±15%) between 25° and −55°C, and significantly increased voltage stability. X‐ray diffraction analyss of these small‐grained materials indicated a suppression of the tetragonal structure toward a more cubic modification.