Room-temperature ferroelectric and ferroelastic orders coexisting in a new tetrafluoroborate-based perovskite
Xiao‐Xian Chen, Xiaoyue Zhang, De‐Xuan Liu, Rui‐Kang Huang, Shasha Wang, Li-Qun Xiong, Wei‐Xiong Zhang, Xiao‐Ming Chen
Abstract
], hosting both ferroelectricity and ferroelasticity at above room temperature. By using the combined techniques of variable-temperature single-crystal X-ray structural analyses, differential scanning calorimetry, and dielectric, second harmonic generation, and piezoresponse force microscopy measurements, we demonstrated the domain structures for ferroelectric and ferroelastic orders, and furthermore disclosed how the delicate interplay between stepwise changed dynamics of organic cations and cooperative deformation of the inorganic framework induces ferroelectric and ferroelastic phase transitions at 311 K and 455 K, respectively. This instance, together with the underlying mechanism of ferroic transitions, provides important clues for designing advanced multiferroic materials based on organic-inorganic hybrid crystals.