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Effect of MnO on the Electrical Properties of Nb-Doped SrTiO3 Varistor

Published online by Cambridge University Press:  16 February 2011

S.-H. Kim ,
H.-W. Seon  and
Yoonho Kim
S.-H. Kim
Affiliation:
Division of Ceramics, Korea Institute of Science and Technology, P. O. Box 131, Seoul, Korea
H.-W. Seon
Affiliation:
Division of Ceramics, Korea Institute of Science and Technology, P. O. Box 131, Seoul, Korea
Yoonho Kim
Affiliation:
Division of Ceramics, Korea Institute of Science and Technology, P. O. Box 131, Seoul, Korea
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Abstract

The effect of MnO on the electrical properties of Nb-doped SrTiO3 was investigated to understand the electronic states of grains and grain boundaries. Grain size and dielectric constant were decreased with increasing Mn-doped content from 0 to 0.07 mol%. However, it was observed that the non-linearity coefficient of Nb-doped SrTiO3 was changed from 5 to 43 with Mn-doped content increasing from 0 to 0.03 mol%. Current-voltage (I-V) characteristics, capacitance-voltage (C-V) measurement, complex plane analysis and impedance spectroscopy were performed to obtain the information about the electrical properties of grains and grain boundaries. The potential barrier height increased and the donor concentration decreased with increasing Mn-doped content. This phenomena, that the electrical properties of Nb-doped SrTiO3 were changed with the addition of Mn, would be determined by the effect which Mn-2-3 substituted for Ti sites. It was observed that the breakdown voltage of single grain boundary was changed from 3.8 V to 8.9 V when measured by micro-electrode method.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 547: Symposium DD – Solid-State Chemistry of Inorganic Materials II , 1998 , 121
Copyright
Copyright © Materials Research Society 1999

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