Crystallization kinetics and dielectric properties of nanocrystalline lead strontium barium niobates

Ching Tai Cheng, Michael T. Lanagan, Jiang Tsair Lin, Beth Jones, Ming Jen Pan

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Abstract

The crystallization kinetics and phase developments of PbO-BaO-SrO-Nb2O5-B2 O3-SiO2-based glass-ceramics was 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 the as-heated surface and the interior of glass-ceramics. This effect 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)Nb2O6 crystals was substantially smaller than that of surface-nucleated crystals. This result facilitated meeting the capacitors as high energy density application due to the ultrafine grains (<60 nm) obtained. The dielectric constant increased from 27 for the as-quenched glass to 200 for a highly crystallized glass-ceramic, which was attributed to a significant volume fraction of (Pb, Sr, Ba)Nb2O6 phase.

Original languageEnglish (US)
Pages (from-to)438-446
Number of pages9
JournalJournal of Materials Research
Volume20
Issue number2
DOIs
StatePublished - Feb 1 2005

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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