کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1465155 | 989682 | 2007 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Evolution of CaCu3Ti4O12 varistor properties during heat treatment in vacuum
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
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چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 33, Issue 7, September 2007, Pages 1187–1190
Journal: Ceramics International - Volume 33, Issue 7, September 2007, Pages 1187–1190
نویسندگان
V.P.B. Marques, A. Ries, A.Z. Simões, M.A. Ramírez, J.A. Varela, E. Longo,