Abstract
The temperature dependence of spontaneous polarization in SbNbO4: 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 Ps provided by the presence of the FeSb and (OiVSb)-type impurity centers are observed in the whole range of ferroelectric ordering. In the SbNbO4 structure, the macrofragments—two types of mesotetrahedra formed by Sb ions and NbO6-octahedra-are established, which are responsible for the spontaneous polarization of the crystal.
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