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Journal of Materials Science

, Volume 42, Issue 16, pp 6696–6700 | Cite as

Effects of oxygen partial pressure control on the microstructure and PTCR properties of Ho doped BaTiO3

  • Soo Kyong Jo
  • Young Ho Han
  • Kwang Hwi Choi
Article

Abstract

Effects of oxygen partial pressure ( \( {\hbox{P}}_{{\hbox{O}}_{\hbox{2}} } \)) control on the electrical properties and microstructural development of (Ba1-xHox)0.997TiO3 were studied. An oxidation condition (\( {\hbox{P}}_{{\hbox{O}}_{\hbox{2}} } \) ∼ 1.0 atm) was maintained during the heating process, and then the specimen was sintered in a reducing atmosphere (\( {\hbox{P}}_{{\hbox{O}}_{\hbox{2}} } \) < 10−9 atm) at 1350 °C, followed by the annealing process at 1000 °C and \( {\hbox{P}}_{{\hbox{O}}_{\hbox{2}} } \) = 1 atm. The switching temperature (TS) from the oxidation atmosphere to the reducing condition was changed from 1100 to 1350 °C. A significant decrease in the room-temperature resisitivity (ρ25) was observed as TS was increased. The temperature coefficient of resistance (TCR) was independent of the change in TS, and closed pores decreased with increasing TS.

Keywords

BaTiO3 Cation Vacancy Ceramic Body BaTiO3 Ceramic Compensation Mode 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  1. 1.Department of Materials EngineeringSungkyunkwan UniversityJangan-gu, SuwonKorea
  2. 2.Joinset Co., LtdAnsanKorea

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