Impedance spectroscopy of grain boundaries in nanophase ZnO

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

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135 Scopus citations


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 (US)
Pages (from-to)2295-2300
Number of pages6
JournalJournal of Materials Research
Issue number9
StatePublished - Sep 1995

ASJC Scopus subject areas

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


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