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Experimental evidence for space charge segregation in Nb-doped BaTiO3

Published online by Cambridge University Press:  31 January 2011

Seok Hyun Yoon  and
Hwan Kim
Seok Hyun Yoon*
Affiliation:
School of Materials Science & Engineering, College of Engineering, Seoul National University, Seoul 151-742, Korea
Hwan Kim
Affiliation:
School of Materials Science & Engineering, College of Engineering, Seoul National University, Seoul 151-742, Korea
*
a)Address all correspondence to this author. e-mial: maniacaa@gong.snu.ac.kr
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Abstract

There is ample experimental evidence demonstrating space charge segregation in acceptor-doped BaTiO3. However there is still some controversy regarding donor-doped BaTiO3. Considering the space charge segregation theory in BaTiO3, the calculated driving force for space charge segregation is larger in acceptor-doped cases than in donor-doped cases. This result explains why acceptor segregation can be easily detected. However, a significant concentration of donors can also cause donor segregation. In donor and acceptor codoped BaTiO3, the grain sizes are very small, and donor segregation can be detected for compositions inducing a large space charge potential. In addition, in compositions that induced a small space charge potential, the grain sizes are very large, and donor segregation is not detected, although the total doping concentration is larger. This phenomenon means that donor segregation is caused by the space charge potential rather than misfit strain energy.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 5 , May 2001 , pp. 1479 - 1486
Copyright
Copyright © Materials Research Society 2001

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