Cooling rate effects on the electrical properties of TiO2-based varistor

✍ Scribed by Hsing-I Hsiang; Shi-Shu Wang

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 297 KB
• Volume: 128
• Category: Article
• ISSN: 0921-5107
• DOI: 10.1016/j.mseb.2005.11.001

✦ Synopsis

The cooling rate effects on the microstructure development and electrical properties of TiO 2 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, Ba 2 Ti 9 O 20 and Bi 2 Ti 4 O 11 . Therefore, the acceptor concentration of Bi +3 (Bi 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.