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Updated: Aug 31, 2025

Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers
Published on: September 4, 2015
Pressure-induced phase transition in α- and β-BiNbO4
Xingbang Dong1,2, Zhanbiao Huangfu1,2, Shiquan Feng1,2
1School of Physics and Electronic Engineering, Zhengzhou University of Light Industry, Zhengzhou, Henan, 450002, China. wz7907@163.com.
Abstract:
BiNbO4 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-BiNbO4 were investigated via in situ X-ray diffraction patterns and Raman spectra up to 46.7 GPa. Upon compression, both BiNbO4 samples become unstable. α-BiNbO4 transformed into the monoclinic C2/c structure at 10.3 GPa, while β-BiNbO4 possessed one P1̄-to-P1 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 ABO4 compounds with polymorphism.
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