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Ferroelectric Phase Transition in Layered Perovskite SrBi 2 Ta 2 O 9
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2002
Year
Crystal StructureEngineeringHalide PerovskitesTa 2Srbi 2Ferroelectric ApplicationSuperconductivityQuantum MaterialsFerroelectric Phase TransitionMaterials SciencePhysicsPerovskite MaterialsLead-free PerovskitesCrystallographyO 9Condensed Matter PhysicsApplied PhysicsFerroelectric MaterialsX-ray Diffraction
Crystal structure of Bi-layered perovskite SrBi 2 Ta 2 O 9 was studied at 1000 K by X-ray diffraction. Rietveld analysis confirmed antiparallel arrangements of TaO 6 octahedra in the high-temperature paraelectric phase (tetragonal 14/mmm, R wp =7.37%). The TaO 6 octahedra are distorted along the c -axis. This crystal favors canted octahedral arrangements below T c (608 K). These result in net spontaneous polarization along the a -axis. We report the first observation of canted ferroelectricity or weak ferroelectricity in SrBi 2 Ta 2 O 9 .