The Influence of Donor-Doped Concentration on the PTCR Characteristics of the Ban-xSmxTiO3 Based Ceramics Sintered in Reducing Atmosphere

Xu Xin Cheng; Dong Xiang Zhou; Zhao Xiong Zhao; Qiu Yun Fu

doi:10.4028/www.scientific.net/AMR.881-883.1031

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 881-883The Influence of Donor-Doped Concentration on the...

The Influence of Donor-Doped Concentration on the PTCR Characteristics of the Ba_n_-xSm_xTiO₃ Based Ceramics Sintered in Reducing Atmosphere

Abstract:

Positive temperature coefficient of resistivity (PTCR) effect and electrical properties of (Ba_n-xSm_x)TiO₃ (BSMT ) samples with different Ba-site/Ti-site ratio (n) and various concentration of the donor-doped Sm³⁺ (x) sintered in a reducing atmosphere and reoxidized in air are investigated. The results show that the room temperature resistivity (ρ_RT) of the semiconducting BSMT ceramics first decreases and then increases with increasing of concentration of the donor-doped Sm³⁺, especially when x is 0.005 mol, the ρ_RT of the BSMT ceramics is the lowest. Moreover, the ρ_RT of the Ba-excess BSMT (n = 1.01) specimens reoxidized at 800 oC for 1 h after sintering at 1270 °C for 30 min in a reducing atmosphere is lower than the Ti-excess ones (n = 0.99), in addition, the ρ_RT of the BSMT specimens increases with an increase of both sintering temperature and reoxidized time.

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Periodical:

Advanced Materials Research (Volumes 881-883)

Pages:

1031-1034

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.881-883.1031

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Online since:

January 2014

Authors:

Xu Xin Cheng*, Dong Xiang Zhou, Zhao Xiong Zhao, Qiu Yun Fu

Keywords:

Ba-Ti Ratio, BaTiO₃ Ceramics, PTCR Effect, Sm₂O₃-Dopant

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