In this study, we investigate the phase transitions of a promising perovskite niobate, RbNbO3, by synchrotron X-ray diffraction, differential scanning calorimetry, and dielectric property measurements. This compound shows a first-order orthorhombictetragonal phase transition at 519 K and does not undergo a transition to a rhombohedral phase down to 5 K. Notably, the spontaneous polarization of the orthorhombic phase is larger than that of a well-studied isostructural perovskite niobate, KNbO3
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Fukuda, M., & Yamaura, K. (2023). Experimental studies on crystal structures and phase transitions in perovskite-type RbNbO3. Journal of the Ceramic Society of Japan, 131(5), 126–129. https://doi.org/10.2109/jcersj2.23012