Dielectric Properties of Reduced Heterogeneous Silica-Titania Glasses

Francelys A. Medina, Eugene Furman, Michael T. Lanagan

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

We have studied the frequency and temperature dependences of the dielectric properties of a heterogeneous silica-titania (SiO2-TiO2) glass by ac impedance spectroscopy measurements in the temperature range 25-700°C and the frequency range 40-107Hz. The heterogeneous glass was prepared by the controlled heat treatment of a homogenous SiO2-TiO2 glass, containing ~7.5wt% TiO2, in a reducing atmosphere to create a microstructure consisting of many discrete particles of the rutile/anatase TiO2 phase dispersed in a homogeneous SiO2-rich glassy matrix. Unlike the homogeneous SiO2-TiO2 glass, which exhibited only one electrical/dielectric dispersion, presumably due to ion hopping, the heterogeneous glass material exhibited two distinct electrical responses in the impedance formalism. We attributed these contributions to the two-phase microstructure and explained the dielectric behavior in terms of the Maxwell-Wagner relaxation arising at the interfaces between the TiO2 crystals and the SiO2-rich matrix phase.

Original languageEnglish (US)
Pages (from-to)358-367
Number of pages10
JournalInternational Journal of Applied Glass Science
Volume1
Issue number4
DOIs
StatePublished - Dec 1 2010

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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