Ferroelectric phase transition in LaBSiO5 crystals from results of thermal and dielectric measurements |
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| Authors: | B A Strukov E P Ragula S Yu Stefanovich I V Shnaidshtein S V Arkhangel’skaya A Onodera |
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| Institution: | (1) M. V. Lomonosov State University, 119899 Moscow, Russia;(2) Hokkaido University, Sapporo, Japan |
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| Abstract: | The specific heat of the ceramic and the permittivity of a single-crystal sample of LaBSiO5, a new ferroelectric in the stilwellite family, were measured in a temperature range which includes the phase transition
point (T
C=140 °C). The excess entropy of the phase transition ΔS=1.05 J/mol · K and the Curie-Weiss constant C
C-W=3.2×103 K were determined. The results indicate that the phase transition in this crystal is of a “mixed” nature and exhibits features
of a displacement-type transition and an order-disorder transition.
Fiz. Tverd. Tela (St. Petersburg) 40, 1310–1312 (July 1998) |
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