期刊
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
卷 2021, 期 12, 页码 1117-1121出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.202001110
关键词
Borates; Polymorphism; Phase transition; Structure elucidation
资金
- Natural Science Foundation of Xinjiang Uygur Autonomous Region of China [2019D01C059]
- Xinjiang Program of Cultivation of Young Innovative Technical Talents [2018Q061]
- National Natural Science Foundation of China [21965033, 51962033]
A new polymorph of Ba3Zn2(BO3)(3)F, alpha-Ba3Zn2(BO3)(3)F, was synthesized and studied for its structural properties, including an anomalous phase transition with different densities in the two polymorphous phases. This was confirmed by detailed structural analyses using powder X-ray diffraction and differential scanning calorimetry.
A new polymorph of Ba3Zn2(BO3)(3)F, alpha-Ba3Zn2(BO3)(3)F, was synthesized and its structure was determined by single crystal X-ray diffraction. The two polymorphous phases of Ba3Zn2(BO3)(3)F are referred to as alpha- and beta-Ba3Zn2(BO3)(3)F according to their synthesis temperature from low to high. Both structures exhibit a similar three-dimensional (3D) framework, while the two-dimensional (2D) (2)(infinity)[Zn2B2O7] layers in their structures show different configurations and feature diverse topological structures. Interestingly, an anomalous phase transition, that is, the high-temperature beta-phase having a higher density, was observed and further confirmed by detailed structural analyses, which shows that the unusual density evolution mainly originates from the different configurations of (2)(infinity)[Zn2B2O7] layers. Moreover, the phase transformation was characterized by powder X-ray diffraction (PXRD) and differential scanning calorimetry (DSC) analyses.
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