Abstract
The synthesis difficulty on ${\text{AgTaO}}_{3}$ ceramic has been surmounted by the high oxygen-pressure sintering. In this study, the synthesized sample was investigated by both dielectric and micro-Raman measurements in detail. As no dielectric anomaly was observed between 2.2 and 694 K, the previously proposed ferroelectric phase transition from $R3c$ to $R\overline{3}c$ at 170 K upon heating is not supported by our study whereas the quantum paraelectric ground state with $R\overline{3}c$ symmetry is more consistent with our experimental findings. Also, it is observed that the phase transition from this rhombohedral ground state to the higher-temperature monoclinic phase occurs at 667 K is purely soft-mode driven. Taking account the observation of additional Raman modes, at least up to 360 K, the existence of symmetry-breaking regions in the quantum paraelectric matrix is also discussed.
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