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Capacitance-vs-voltage and frequency characteristics of SnO2-Co3O4-Nb2O5-Cr2O3 ceramics

Published online by Cambridge University Press:  30 October 2009

A. N. Bondarchuk ,
A. B. Glot ,
S. V. Mazurik ,
M. Marquez Miranda  and
G. Jimenez-Santana
A. N. Bondarchuk*
Affiliation:
Universidad Tecnológica de la Mixteca, Huajuapan de León, Oaxaca, C.P. 69000, Mexico
A. B. Glot
Affiliation:
Universidad Tecnológica de la Mixteca, Huajuapan de León, Oaxaca, C.P. 69000, Mexico
S. V. Mazurik
Affiliation:
Dniepropetrovsk National University, 13 Naukovyi St., 49050 Dniepropetrovsk, Ukraine
M. Marquez Miranda
Affiliation:
Universidad Tecnológica de la Mixteca, Huajuapan de León, Oaxaca, C.P. 69000, Mexico
G. Jimenez-Santana
Affiliation:
Universidad Tecnológica de la Mixteca, Huajuapan de León, Oaxaca, C.P. 69000, Mexico
*
alexbondua@yahoo.com
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Abstract

Electrical properties of SnO2-Co3O4-Nb2O5-Cr2O3 ceramics sintered at 1100−1400 °C were studied. Materials exhibit known varistor properties (superlinear and symmetric current-voltage characteristic) only if sintered at relatively high temperatures of 1300−1400 °C. In ceramics sintered at 1100−1200 °C, the current limiting effect (current is saturated and even decreased with voltage increase) and its transformation into the varistor effect were found. It was ascertained that the capacitance of samples is decreased with increasing frequency more sharply for ceramics sintered at 1100−1200 °C than at 1300−1400 °C. The low-frequency capacitance and ac conductance of ceramics sintered at 1100−1200 °C were increased and showed further strong decrease with electric field. The results of electrical measurements are discussed in terms of the barrier model.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 48 , Issue 3 , December 2009 , 30302
Copyright
© EDP Sciences, 2009

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