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Investigation of a PTCR Effect in The (Bi0.5K0.5)TiO3-BaTiO3 Solid Solution Semiconducting Ceramics

Jonghoo Paik 1Young Hun Jeong Young-Jin Lee Yong-Jun Park 

1. Korea Institute of Ceramic Engineering and Technology (KICET), , Gasang-Dong, Geumcheon-Gu, Seoul 153023, Korea, South

Abstract

An anomalous positive temperature coefficient of electrical resistivity(PTCR) was investigated in a ferroelectric lead-free perovskite-type compound (Bi0.5K0.5)TiO3 within BaTiO3-based solid solution ceramics. The effect of Nb2O5 content on the electrical properties and the microstructure of (1-x) (Bi0.5K0.5)TiO3- x BaTiO3 (BKBT) ceramics made using a conventional mixed oxide process also has been studied. The Curie Temperature was obviously increased with the increasing of (Bi0.5K0.5)TiO3 content. The addition of Nb2O5 to BKBT has significantly improved its PTCR properties. For the sample containing 0.025 mol% Nb2O5, it showed good PTCR properties; low resistivity at room temperature (ρr) of 30 Ω•cm, a high PTCR intensity of approximately 3.3×103 with high Curie temperature (TC) of 155oC.

 

Auxiliary resources (full texts, presentations, posters, etc.)
  1. PRESENTATION: Investigation of a PTCR Effect in The (Bi_{0.5}K_{0.5})TiO_{3}-BaTiO_{3} Solid Solution Semiconducting Ceramics, Microsoft Office Document, 0MB
 

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Presentation: Poster at E-MRS Fall Meeting 2008, Symposium C, by Jonghoo Paik
See On-line Journal of E-MRS Fall Meeting 2008

Submitted: 2008-05-13 08:00
Revised:   2009-06-07 00:48