Crystallization kinetics and dielectric properties of fresnoite BaO-TiO2-SiO2 glass-ceramics

Badri Rangarajan, Tom Shrout, Michael Lanagan

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32 Scopus citations

Abstract

Nucleation and crystallization kinetics of fresnoite (Ba 2TiSi2O8) crystals in BaO-TiO 2-SiO2 glasses have been explored for dielectric applications. The volume fractions crystallized at different temperatures and times were tracked by XRD analysis. The activation energy of crystallization was estimated from DTA results to be about 528 kJ/mol, which is consistent with the value obtained by XRD results. The Avrami parameter values calculated at different temperatures from DTA results were found to be between 3.2 and 3.9, indicating that the growth is three dimensional and the mechanism of growth is interface-controlled. Additionally, because of compositional similarities, the dielectric contrast between the glass (εr∼15) and the resulting glass-ceramic (εr∼18) was minimal.

Original languageEnglish (US)
Pages (from-to)2642-2647
Number of pages6
JournalJournal of the American Ceramic Society
Volume92
Issue number11
DOIs
StatePublished - Nov 1 2009

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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