Title :
Resistivity and Dielectric Properties of Bi1/2Na1/2TiO3-mixed (Ba,Sr)TiO3 Ceramics
Author :
Hoshi, Y. ; Xiang, P.-H. ; Takeda, H. ; Nishida, T. ; Uchiyama, K. ; Shiosaki, T.
Author_Institution :
Nara Inst. of Sci. & Technol., Nara
Abstract :
In order to prepare lead-free BaTiO3 - based positive temperature coefficient of resistance (abbreviated to PTCR) ceramics, 2.0, 4.0, 6.0, 8.0, 10 mol % of Bi1/2Na1/2TiO3 (abbreviated to BNT) added Ba 0.92Sr0.08TiO3 (abbreviated to BST) were fabricated by the conventional solid state reaction. Phase and microstructure characterizations revealed that no obvious BNT phase was found in the final sintered BNT- added BST ceramics, indicating that the BNT phase and BST phase formed a solid-solution during sintering. Without doping other special elements, an obvious PTCR effect was observed in the BNT- added BST samples sintered at 1350 degC in air. To reveal the origin of PTCR effect in the BNT- added BST ceramics, the dielectric properties were also investigated. The BNT- mixed BST (abbreviated to BST- BNT) PTCR ceramics exhibited higher Curie temperatures than that of BST sample.
Keywords :
Curie temperature; barium compounds; crystal microstructure; electrical resistivity; ferroelectric ceramics; permittivity; sintering; solid solutions; BNT phase; Bi0.5Na0.5TiO3-BaTiO3-SrTiO3; Curie temperature; PTCR ceramics; dielectric properties; electrical resistivity; lead-free ceramics; microstructure characterization; sintering; solid solution; solid state reaction; Binary search trees; Bismuth; Ceramics; Conductivity; Dielectrics; Environmentally friendly manufacturing techniques; Microstructure; Solid state circuits; Strontium; Temperature;
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.2007.4393414
