Defect-property correlations in garnet crystals. VII: The electrical conductivity and defect structure of yttrium aluminum and yttrium iron garnet solid solutions

S. R. Rotman, H. L. Tuller

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

The conduction mechanisms in yttrium aluminum and yttrium iron garnet solid solutions have been studied as a function of temperature, iron concentration and partial pressure of oxygen. At low concentrations of iron, ac conductivity and ionic transference measurements show the solid solution to be a mixed ionic-electronic conductor with an ionic mobility characterized by an activation energy of 2.6-2.8 eV and a p-type electronic conductivity with activation energy of 3.0-3.3 eV. High concentrations of iron cause a dramatic increase in the electrical conductivity connected with the formation of an Fe impurity band found to lie 1.9 eV below the conduction band. Transport through this band is via an activated hopping process with an activation energy of 0.7 eV for 6 fraction percent Fe. A defect model is presented which is consistent with our experimental observations including the conductivity maxima obtained at high Po2's for high Fe levels.

Original languageEnglish
Pages (from-to)95-104
Number of pages10
JournalJournal of Electroceramics
Volume2
Issue number2
DOIs
StatePublished - 1 Dec 1998

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Ceramics and Composites
  • Materials Chemistry
  • Electrical and Electronic Engineering

Fingerprint

Dive into the research topics of 'Defect-property correlations in garnet crystals. VII: The electrical conductivity and defect structure of yttrium aluminum and yttrium iron garnet solid solutions'. Together they form a unique fingerprint.

Cite this