Size dependence of dielectric properties and structural metastability in ferroelectrics |
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| Authors: | L Zhang W L Zhong C L Wang Y P Peng Y G Wang |
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| Institution: | (1) Department of Physics, Shandong University, Jinan, 250100, P.R. China, CN |
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| Abstract: | The size effect of the dielectric properties and the barrier height was investigated in the ferroelectric solid solution BaxSr1-xTiO3 system. The decrease of the grain size causes the suppression of the ferroelectricity, and the increase of the relaxation
frequency. Barrier heights increase with increasing grain size. The result is analogous to magnetic phase transitions in nanocrystals
and other solid-solid phase transitions in nanocrystals. It suggests a general rule that may be of use in the discovery of
new metastable phases. An explanation of this phenomenon was given by an electric potential model that agrees well with the
experimental results. For BaxSr1-xTiO3 system, the decrease of xcauses the decrease of the barrier height.
Received 3 August 1998 and Received in final form 22 November 1998 |
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| Keywords: | PACS 77 22 Gm Dielectric loss and relaxation - 77 80 Bh Phase transitions and Curie point - 77 80 -e Ferroelectricity and antiferroelectricity |
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