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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
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
Copyright
Copyright © Materials Research Society 2002

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