Title of article
Evolution of CaCu3Ti4O12 varistor properties during heat treatment in vacuum
Author/Authors
V.P.B. Marques، نويسنده , , A. Ries، نويسنده , , A.Z. Simoes، نويسنده , , M.A. Ramirez، نويسنده , , J.A. Varela، نويسنده , , E. Longo، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2007
Pages
4
From page
1187
To page
1190
Abstract
Calcium copper titanate (CaCu3Ti4O12) ceramic varistors were prepared by solid-state method. The samples were several times heat treated in vacuum and the evolution of electrical characteristics were monitored by current density versus electric field measurements and impedance spectroscopy. Repeated heat treatments in vacuum (900 °C for 1 h, 0.01 Torr) lead to a desorption of oxygen adsorbed at the grain boundaries and consequently to a degradation of the varistor properties. During further successive heat treatments some oxygen from the grain interior moves to the grain boundary thereby partially restoring the varistor properties.
Keywords
E. Varistors , Calcium copper titanate
Journal title
Ceramics International
Serial Year
2007
Journal title
Ceramics International
Record number
1270044
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