Temperature dependence of effective grain core/single crystal dielectric constants for acceptor-doped oxygen ion conductors

Nicola H. Perry, Ted C. Yeh, Thomas O. Mason

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Effective grain core or single crystal dielectric constants of four solid oxide electrolytes-yttria-stabilized zirconia (YSZ with 8 and 7 mol% yttria), tetragonal zirconia polycrystals (TZP with 3 mol% yttria), strontium- and magnesium-doped lanthanum gallate (LSGM), and gadolinia-doped ceria (GDC, with 20 mol% gadolinia)-were studied as a function of temperature by AC-impedance spectroscopy and equivalent circuit fitting. Unlike their undoped counterparts, the acceptor-doped oxides consistently exhibited an upturn in effective grain core/single crystal dielectric constant in the vicinity of 350-500 K. This temperature-dependent behavior was attributed to the onset of thermally activated dipolar relaxation-an explanation supported by the appearance of loss tangent peaks at higher temperatures. Differences between "effective" dielectric constants and frequency-dependent complex dielectric constants for the grain core/single crystal frequency range, and applications of the effective dielectric constant data are discussed.

Original languageEnglish
Pages (from-to)508-515
Number of pages8
JournalJournal of the American Ceramic Society
Volume94
Issue number2
DOIs
Publication statusPublished - Feb 1 2011

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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