Effect of reoxidation on positive temperature coefficient of resistance behavior for BaTiO3-K0.5Bi0.5TiO3 ceramics
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- 作者：Qibin Yuan (1)
Yongping Pu (1)
Jifeng Wei (1) - 关键词：PTC ; Reoxidation ; BaTiO3 ; K0.5Bi0.5TiO3 ceramics ; Curie temperature
- 刊名：Journal of Electroceramics
- 出版年：2013
- 出版时间：2 - April 2013
- 年：2013
- 卷：30
- 期：1
- 页码：98-101
- 全文大小：378KB
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Yongping Pu (1)
Jifeng Wei (1)
1. School of Materials Science & Engineering, Shaanxi University of Science and Technology, Xi’an, 710021, China - ISSN：1573-8663
文摘
As a positive temperature coefficient of resistivity (PTCR) material, (1-x)BaTiO3-xK0.5Bi0.5TiO3 (BT-KBT, 0.05?x ?.15) ceramics without any donor doping were prepared by a conventional oxide mixing method. All samples were sintered in an Ar atmosphere at 1280?~-350°C, subsequently, reoxidized at 800?~-100°C in a gas mixture (99?%Ar-?%O2). The PTCR behavior of BT-KBT ceramics were investigated in terms of KBT content, reoxidation temperature and time. The results showed that the BT-KBT ceramics exhibited an abrupt increase in their resistivity near the Curie temperature (Tc) after annealing in gas mixture, Tc of 0.9BT-0.1KBT ceramic was shifted to a higher temperature (~150°C). Furthermore, the room-temperature resistivity (ρRT) of ceramic samples sintered in Ar and reoxidized in a gas mixture decreased to 102?Ω·cm. The jump in resistivity (maximum resistivity [ρmax]/minimum resistivity [ρmin]) was enhanced by three orders of magnitude through a suitable reduction–reoxidation method without sacrificing the ρRT.