Diffuse phase transition in NaNbO3:Gd single crystals

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机构：
[1] Raevski, I.P.
[2] Prosandeev, S.A.
[3] Abdulvakhidov, K.G.
[4] Shilkina, L.A.
[5] Raevskaya, S.I.
[6] Eremkin, V.V.
[7] Smotrakov, V.G.
[8] Jastrabik, L.
来源：
Raevski, I.P. (pros@nist.gov) | 1600年 / American Institute of Physics Inc.卷 / 95期
关键词：
Antiferroelectricity - Crystal growth - Crystal lattices - Deposition - Diffusion - Doping (additives) - Ferroelectric ceramics - Free energy - Gadolinium - Order disorder transitions - Permittivity - Quenching - Single crystals - Solid solutions - X ray diffraction analysis;
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摘要：
The gradual diffusion of an antiferroelectric phase transition of NaNbO3 single crystals, while doped with Gd, was investigated. A Landau-type theory that includes the coupling of and order parameter with local quenched fields was used to describe the diffuseness of the phase transition. The x-ray diffraction analysis was used to study the single crystals. The expressions obtained by the theory described both the Curie-Weiss behavior of dielectric permitivity above and below Curie-Weiss temperature and temperature dependence of inverse dielectric permittivity in the intermediate region.
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