Title :
Fabrication and PTC Properties of Lead-Free Element-Modified Barium Titanate Semiconducting Ceramics with Tc130°C
Author :
Takeda, H. ; Harinaka, H. ; Hoshi, Y. ; Kinoshida, T. ; Nishida, T. ; Uchiyama, K. ; Shimada, T. ; Katsuyama, Y. ; Shiosaki, T.
Author_Institution :
Nara Inst. of Sci. & Technol., Nara
Abstract :
The fabrication processes in air of semiconducting bismuth-and sodium-modified barium titanate, Ba1-x(Bi1/2Na1/2)xTiO3 (BBNT100x) ceramics were investigated for a lead-free PTC (positive temperature coefficient of resistivity) thermistor material usable over 130degC. The two processes and their electric properties are described. The Nb-doped BBNT6 ceramics and BBNT6 ones sintered with the oxygen-containing a-Zr metal powders have a resistivity at room temperature rhoRT on the order of 103-106 Omegacm and showed PTC behaviors. The BBNT20 ceramics displayed their resistivity changes over 200degC.
Keywords :
barium compounds; bismuth compounds; ceramics; doping; electrical resistivity; niobium; powder technology; semiconductor materials; sintering; sodium compounds; thermistors; zirconium; BBNT100x ceramics; BaBi0.5Na0.5TiO3; lead-free PTC thermistor material; niobium-doped BBNT6 ceramics; oxygen-containing a-zirconium metal powders; positive temperature resistivity coefficient; semiconducting bismuth-modified barium titanate; semiconducting sodium-modified barium titanate; sintering; Barium; Bismuth; Ceramics; Conductivity; Environmentally friendly manufacturing techniques; Fabrication; Lead compounds; Semiconductivity; 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.2007.4393408
