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Crystallization and Dielectric Properties of SrO–BaO–Nb 2 O 5 –SiO 2 Tungsten‐Bronze Glass‐Ceramics
Author(s) -
Shyu JiinJyh,
Wang JennRong
Publication year - 2000
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.1151-2916.2000.tb01694.x
Subject(s) - materials science , dielectric , strontium barium niobate , crystallization , nucleation , tungsten , ceramic , mineralogy , phase (matter) , permittivity , analytical chemistry (journal) , composite material , metallurgy , chemical engineering , ferroelectricity , chemistry , optoelectronics , organic chemistry , chromatography , engineering
The crystallization and dielectric properties of SrO–BaO–Nb 2 O 5 –SiO 2 glass‐ceramics have been investigated. Glass‐ceramics that contain strontium barium niobate (SBN) as a primary crystalline phase, which has a tungsten bronze structure, are produced. The formation of crystalline secondary phases also has been studied. The SBN phase shows evidence of both surface nucleation and bulk nucleation, and the crystals have an average composition of Sr 0.47 Ba 0.53 Nb 2 O 6 . The dendritic morphology of the SBN crystals has been examined. The SBN content and composite dielectric constant each has been studied as a function of heating temperature/time. The highest SBN content and dielectric constant obtained in the present study are 42 vol% and 180, respectively. The dielectric constant of the glass‐ceramics is determined primarily by the SBN content and the residual glass phase. The dielectric constant of the randomly oriented SBN crystal in the glass‐ceramics is calculated, using dielectric mixture rules, to be ∼400.