Crystallization, microstructure and dielectric properties of PbO-BaO-SrO-Nb2O5-B2O3-SiO 2 based glass-ceramics

Ching Tai Cheng, Ming Jen Pan, Michael Lanagan, Beth Jones

Research output: Contribution to journalConference article

Abstract

The crystallization kinetics and phase developments of PbO-BaO-SrO-Nb 2O5-B2O3-SiO2 based glass-ceramics have been investigated. Lead strontium barium niobate, (Pb,Sr,Ba)Nb2O6, with a tetragonal tungsten-bronze structure formed as the major crystalline phase, which showed evidence of both surface and bulk crystallization. The results of the present study showed significant evidence of a change in crystallization mechanism between as-heated surface and interior of glass-ceramics. Such effects could be attributed to a volatilization of PbO taken place readily on the surface region of sample during heating. The grain size of the bulk-nucleated (Pb,Sr,Ba)Nb 2O6 crystals was substantially much smaller than that of surface-nucleated crystals. This result facilitated to meet the high energy density capacitor application due to ultra-fine grains (< 60 nm) obtained. The dielectric constant increased from 27 for the as-quenched glass to 200 for a highly crystallized glass-ceramics, which was attributed to a significant volume fraction of PSBN phase.

Original languageEnglish (US)
Pages (from-to)151-166
Number of pages16
JournalCeramic Transactions
Volume167
StatePublished - Aug 22 2005
Event106th Annual Meeting of the American Ceramic Society - Indianapolis, IN, United States
Duration: Apr 18 2004Apr 21 2004

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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