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Spontaneous Polarization of Fe-Doped SbNbO_4 Crystals

机译:Fe掺杂SbNbO_4晶体的自发极化

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摘要

The temperature dependence of spontaneous polarization in SbNbO_4:Fe crystals has been studied. The temperatures of the ferroelectric and the structural phase transitions (537 ± 1) K and (876 ± 1) K are determined from the permittivity data. The anomalies in the temperature dependence of P_s provided by the presence of the Fe_(Sb) and (O_iV_(Sb))-type impurity centers are observed in the whole range of ferroelectric ordering. In the SbNbO_4 structure, the macrofragments-two types of mesotetrahedra formed by Sb ions and NbO_6-octahedra-are established, which are responsible for the spontaneous polarization of the crystal.
机译:研究了SbNbO_4:Fe晶体中自发极化的温度依赖性。铁电和结构相变的温度(537±1)K和(876±1)K由介电常数数据确定。在铁电有序的整个范围内观察到由Fe_(Sb)和(O_iV_(Sb))型杂质中心的存在所引起的P_s的温度依赖性异常。在SbNbO_4结构中,建立了由Sb离子和NbO-6-8八面体形成的两种类型的中四面体大片段,它们负责晶体的自发极化。

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