Low Temperature Ionic Conductivity of an Acceptor Doped Perovskite Part I: Impedance Spectroscopy of Single Crystalline SrTiO3

Published: June 18, 2016

Author(s)

Russell A. Maier

Abstract

Low temperature conductivity mechanisms are identified in acceptor doped SrTiO3 single crystals quenched from high temperatures under reducing conditions. Impedance spectroscopy measurements on samples of the prototypical perovskite structure doped with iron provides a framework for creating a complete conductivity model for a well-defined point defect system. Dominant conductivity mechanisms are identified in the room temperature range as being controlled by oxygen vacancy ionic hopping. The activation energy for oxygen vacancy migration, an often debated value in the perovskite community, is determined to lie within the range of ~0.6- 0.75eV.
Citation: Journal of the American Ceramic Society
Volume: 99
Issue: 10
Pub Type: Journals

Keywords

oxygen vacancy, ionic conduction, perovskite, impedance spectroscopy
Created June 18, 2016, Updated November 10, 2018