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 Bi 2Ti4O11. Therefore, the acceptor concentration of Bi+3 (BiTi′) 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.
|頁（從 - 到）||25-29|
|期刊||Materials Science and Engineering B: Solid-State Materials for Advanced Technology|
|出版狀態||Published - 2006 三月 15|
All Science Journal Classification (ASJC) codes