Title :
Fabrication and Characterization of Semiconductive Ceramics using BaTiO3-(Bi1/2K1/2)TiO3 System
Author :
Harinaka, H. ; Takeda, H. ; Nishida, T. ; Uchiyama, K. ; Shiosaki, T.
Author_Institution :
Nara Inst. of Sci. & Technol., Nara
Abstract :
As a candidate of a lead-free positive temperature coefficient of resistivitiy (PTC) themistor material, barium titanate (BaTiO3) -based solid-solution ceramics, BaTiO3-(Bi1/2K1/2)TiO3 (BBKT100x), have been synthesized by the conventional ceramic fabrication technique. The maximum temperature of the dielectric constant (Tm) of the BBKTIOOx ceramics monotonously increased with the increasing amount of x. The Tm values of the BBKTIOOx ceramics with x>0.0 were higher than that of BaTiO3 (=130degC). The peak temperature (Tp) of the pyroelectric coefficient showed that the ferroelectricity of the BBKT100x ceramics disappeared at Tm. The reduced BBKT5 ceramics show PTC characteristics as well as a semiconductivity.
Keywords :
barium compounds; bismuth compounds; electrical resistivity; ferroelectric ceramics; permittivity; potassium compounds; pyroelectricity; semiconductor materials; thermistors; BBKT100x ceramics; BaTiO3-Bi0.5K0.5TiO3; barium titanate-based solid-solution ceramics; ceramic fabrication; dielectric constant; ferroelectricity; lead-free positive temperature resistivity coefficient; pyroelectric coefficient; semiconductive ceramics; solid-solution ceramics; themistor material; Barium; Ceramics; Dielectric constant; Environmentally friendly manufacturing techniques; Fabrication; Pyroelectricity; Semiconductivity; Semiconductor materials; Temperature; Titanium compounds;
Conference_Titel :
Applications of Ferroelectrics, 2007. ISAF 2007. Sixteenth IEEE International Symposium on
Conference_Location :
Nara
Print_ISBN :
978-1-4244-1334-8
Electronic_ISBN :
1099-4734
DOI :
10.1109/ISAF.2007.4393413
