Title of article
Cooling rate effects on the electrical properties of TiO2-based varistor
Author/Authors
Hsiang، نويسنده , , Hsing-Yi and Wang، نويسنده , , Shi-Shu، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2006
Pages
5
From page
25
To page
29
Abstract
The cooling rate effects on the microstructure development and electrical properties of TiO2 ceramics are studied using transmission electron microscopy (TEM), energy dispersion spectrometer (EDS) and X-ray diffractometer (XRD). Barium and bismuth were exsolved during cooling and reacted with rutile to form secondary phases, Ba2Ti9O20 and Bi2Ti4O11. Therefore, the acceptor concentration of Bi+3 ( B i Ti ′ ) in the rutile grain near the grain boundary areas in furnace-cooled samples were lower than that in quenched samples. As the acceptor concentration decreased, the depletion width and barrier height decreased. Consequently, the quenched samples possessed higher nonlinear exponent (α) values than furnace-cooled samples.
Keywords
Tiatnia oxide , Varistor , microstructure , Second phase
Journal title
MATERIALS SCIENCE & ENGINEERING: B
Serial Year
2006
Journal title
MATERIALS SCIENCE & ENGINEERING: B
Record number
2143846
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