IMPEDANCE SPECTROSCOPY OF GRAIN-BOUNDARIES IN NANOPHASE ZNO

被引:138
作者
LEE, J
HWANG, JH
MASHEK, JJ
MASON, TO
MILLER, AE
SIEGEL, RW
机构
[1] NORTHWESTERN UNIV,DEPT MAT SCI,EVANSTON,IL 60208
[2] ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439
基金
美国国家科学基金会;
关键词
D O I
10.1557/JMR.1995.2295
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Sintered compacts of nanophase ZnO (similar to 60 nm average grain size, presintered at 600 degrees C) were made from powders (similar to 13 nm) prepared by the gas-condensation technique. Impedance spectra were taken as a function of temperature over the range 450-600 degrees C and as a function of oxygen partial pressure over the range 10(-3)-1 atm (550 and 600 degrees 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.
引用
收藏
页码:2295 / 2300
页数:6
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