Impedance spectroscopy of grain boundaries in nanophase ZnO

J. Lee, A. E. Miller, T. O. Mason

Research output: Contribution to journalArticle

125 Citations (Scopus)

Abstract

Sintered compacts of nanophase ZnO (∼60 nm average grain size, presintered at 600 °C) were made from powders (∼13 nm) prepared by the gas-condensation technique. Impedance spectra were taken as a function of temperature over the range 450-600 °C and as a function of oxygen partial pressure over the range 10-3—l atm (550 and 600 °C only). The activation energy was determined to be 55 kJ/mole (0.57 eV) and was independent of oxygen partial pressure. The oxygen partial pressure exponent was -1/6. Impedance spectra exhibited nonlinear I-V behavior, with a threshold of approximately 6 V. These results indicate that grain boundaries are governing the electrical properties of the compact. Ramifications for oxygen sensing and for grain boundary defect characterization are discussed.

Original languageEnglish
Pages (from-to)2295-2300
Number of pages6
JournalJournal of Materials Research
Volume10
Issue number9
DOIs
Publication statusPublished - Sep 1995

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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