Dong Xingbang, Huangfu Zhanbiao, Feng Shiquan, Liang Yongfu, Zhang Huanjun, Zhu Xiang, Yang Kun, Wang Zheng, Cheng Xuerui, Su Lei
School of Physics and Electronic Engineering, Zhengzhou University of Light Industry, Zhengzhou, Henan, 450002, China.
Henan key laboratory of magnetoelectric information functional materials, Zhengzhou, Henan, 450002, China.
Phys Chem Chem Phys. 2022 Aug 31;24(34):20546-20552. doi: 10.1039/d2cp03040c.
BiNbO has attracted a great deal of interest due to its excellent photocatalytic activities. Besides, it possesses rich polymorphism. Here, the structural stability and structural evolution of orthorhombic α- and triclinic β-BiNbO were investigated X-ray diffraction patterns and Raman spectra up to 46.7 GPa. Upon compression, both BiNbO samples become unstable. α-BiNbO transformed into the 2/ structure at 10.3 GPa, while β-BiNbO possessed one 1̄-to-1 isostructural phase transition around 12.7 GPa, and for the first time the crystal structure of each high pressure phase was identified. Both high pressure structures remained stable without obvious symmetry changes during compression to 46.7 GPa. In addition, both phase transitions were reversible upon decompression. These results provide insights to understand pressure-induced reversible phase transition in ABO compounds with polymorphism.
BiNbO因其优异的光催化活性而备受关注。此外，它具有丰富的多晶型性。在此，利用X射线衍射图谱和拉曼光谱研究了正交α-BiNbO和三斜β-BiNbO在高达46.7 GPa压力下的结构稳定性和结构演化。在压缩过程中，两种BiNbO样品均变得不稳定。α-BiNbO在10.3 GPa时转变为2/结构，而β-BiNbO在12.7 GPa左右发生了一次1̄到1的同构相变，并且首次确定了每个高压相的晶体结构。在压缩至46.7 GPa的过程中，两种高压结构均保持稳定，没有明显的对称性变化。此外，减压时两个相变都是可逆的。这些结果为理解具有多晶型性的ABO化合物中压力诱导的可逆相变提供了见解。
