Impedance spectroscopy of grain boundaries in nanophase ZnO

J. Lee, J. H. Hwang, J. J. Mashek, T. O. Mason, A. E. Miller, R. W. Siegel

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Abstract

Sintered compacts of nanophase ZnO (approximately 60 nm average grain size, presintered at 600 °C) were made from powders (approximately 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 10-3-1 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
Publication statusPublished - Sep 1995

ASJC Scopus subject areas

  • Materials Science(all)

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    Lee, J., Hwang, J. H., Mashek, J. J., Mason, T. O., Miller, A. E., & Siegel, R. W. (1995). Impedance spectroscopy of grain boundaries in nanophase ZnO. Journal of Materials Research, 10(9), 2295-2300.