Abstract
We successfully synthesized perovskite-type RbTaO3 at 1173 K under 4 GPa. RbTaO3 crystalized as a cubic system (Pm3̄m space group (SG), a = 4.04108(3) Å) at 300 K in contrast to the orthorhombic perovskite-type RbNbO3 prepared under the same conditions. During the cooling process, it reversibly transformed into a tetragonal phase (SG: P4mm) at 270 K, and into an orthorhombic phase (SG: Amm2) at 80 K. Corresponding to the phase transition, the relative permittivity showed a peak at 270 K with a maximum value of approximately 2000 and a kink at 80 K. This transition scheme is analogous to well-known displacement-type ferroelectrics of BaTiO3 and KNbO3. This is in contrast to KTaO3, which retains a cubic system and quantum paraelectric properties at the lowest temperature.
Published Version
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