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

fYear

2007

fDate

27-31 May 2007

Firstpage

823

Lastpage

824

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 Bi_1/2Na_1/2TiO₃ (abbreviated to BNT) added Ba _0.92Sr_0.08TiO₃ (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; Bi_0.5Na_0.5TiO₃-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;

fLanguage

English

Publisher

ieee

Conference_Titel

Applications of Ferroelectrics, 2007. ISAF 2007. Sixteenth IEEE International Symposium on

Conference_Location

Nara

ISSN

1099-4734

Print_ISBN

978-1-4244-1334-8

Electronic_ISBN

1099-4734

Type

conf

DOI

10.1109/ISAF.2007.4393414

Filename

4393414