Journal
MATERIALS LETTERS
Volume 60, Issue 12, Pages 1554-1557Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2005.11.090
Keywords
SnO2; varistors; microstructure; electrical properties
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The variation of the electrical properties of a well-known tin oxide varistor composition in relation to the sintering time for temperatures of 1300 and 1350 degrees C was studied in this work. It was verified that the barrier voltage value, nu(b), varies according to the varistor sintering time. Stable electrical barriers between 2.0 and 2.4 V/barrier produce varistors with non-linear coefficients higher than 35, independently of the sintering temperature. The variation of the grain size in relation to the sintering time was 45.1% for sintering at 1300 degrees C and 33.6% for sintering at 1350 degrees C, considering the minimum time of I h and the maximum of 12 h, with considerable variations in the respective electrical breakdown fields. Therefore, the sintering time is a very important variable which should not be despised in the project of tin oxide varistor production. (c) 2006 Published by Elsevier B.V.
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