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Diffuse phase transition in BaTi1-xSnxO3 ceramics: An intermediate state between ferroelectric and relaxor behavior

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5 Author(s)
Shvartsman, V.V. ; Angewandte Physik, Universität Duisburg-Essen, D-47048 Duisburg, Germany ; Kleemann, W. ; Dec, J. ; Xu, Z.K.
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Dielectric relaxation and polar structures of BaTi1-xSnxO3 ceramics, x=0.10–0.20, are investigated by means of dielectric spectroscopy and piezoresponse force microscopy. A transition regime between “normal” ferroelectric and relaxor behaviors is encountered. In the compositions with x=0.10, a complex domain pattern confirming the ferroelectric state is observed. Strong dielectric relaxation around Tm is attributed to domain wall motion. On the other hand, the dielectric spectra in the sample with x=0.20 are very similar to those observed in relaxor ferroelectrics. Analysis of the relaxation spectra at the intermediate concentration, x=0.15, reveals both domain wall response and an additional contribution related to mesoscale polar structures. The appearance of relaxor behavior in BaTi1-xSnxO3 is discussed within the framework of the random field model.

Published in:

Journal of Applied Physics  (Volume:99 ,  Issue: 12 )

Date of Publication:

Jun 2006

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