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'The Role of the Grain Boundary on the Resistivity of Pb(Fe1/2Nb1/2)O3 at Room Temperature

Published online by Cambridge University Press:  01 February 2011

Sang-Bop Lee ,
Kwang-Ho Lee  and
Hwan Kim
Sang-Bop Lee
Affiliation:
School of Materials Science and Engineering, Seoul National University, Seoul, 151-744, Korea
Kwang-Ho Lee
Affiliation:
School of Materials Science and Engineering, Seoul National University, Seoul, 151-744, Korea
Hwan Kim
Affiliation:
School of Materials Science and Engineering, Seoul National University, Seoul, 151-744, Korea
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Abstract

The effect of changing sintering temperature on the grain boundary properties and the room temperature resistivity (ρRT) of Pb(Fe1/2Nb1/2)O3 (PFN) was investigated. Monitering the temperature dependence of resistivity showed that the ρRT's of 1050°C and 1150°C-sintered specimen were 1011ΩEcm and 104ΩEcm respectively, but the resistivity above 300°C became nearly identical. The previous model, that the low resistivity of PFN is due to the electron hopping between Fe2+ and Fe3+ driven by the reduction of PFN, couldn't explain this phenomenon, and the reconsideration of the Fe reduction revealed that the difference of electron concentration between the 1050°C and 1150°C-sintered specimen couldn't exceed one order of magnitude. The role of the grain boundary was introduced in order to account for this phenomenon.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 718: Symposium D – Perovskite Materials , 2002 , D10.15
Copyright
Copyright © Materials Research Society 2002

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