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Crystallization and dielectric properties of SrO–BaO–Nb2O5–GeO2 tungsten–bronze glass–ceramics

Published online by Cambridge University Press:  31 January 2011

Jiin-Jyh Shyu  and
Hsin-Wei Peng
Jiin-Jyh Shyu
Affiliation:
Department of Materials Engineering, Tatung University, Taipei 104, Taiwan, People's Republic of China
Hsin-Wei Peng
Affiliation:
Department of Materials Engineering, Tatung University, Taipei 104, Taiwan, People's Republic of China
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Abstract

The crystallization and dielectric properties of SrO–BaO–Nb2O5–GeO2 glass–ceramics were investigated. One- and two-stage heat-treatment methods were used to convert the parent glass to glass–ceramics. Strontium barium niobate (SBN) with a tetragonal tungsten-bronze structure formed as the major crystalline phase. When the crystallizing temperature/time was increased, the secondary crystalline BaGe2O5 phase coexisted with SBN. BaGe2O5 formed as a surface layer grown from the surface into the interior of the sample. The dendritic morphology of SBN crystals was examined. The glass–ceramics crystallized by two-stage heat treatment have higher dielectric constants than those crystallized by one-stage heat treatment. The highest dielectric constant that was obtained in the present glass–ceramics was 320. The glass–ceramics showed relaxor-type dielectric behavior.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 7 , July 2001 , pp. 2057 - 2063
Copyright
Copyright © Materials Research Society 2001

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