Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 7, Pages 3540-3544Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202014279
Keywords
band gaps; birefringent materials; slow evaporation; stannous fluoride; stereochemical-activity lone pair
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Funding
- Shanghai Cooperation Organization Science and Technology Partnership Program [2020E01019]
- National Natural Science Foundation of China [U2003306, 61835014, 51972336]
- Tianshan Cedar Program of Scientific and Technological Talents [2017XS23]
- International Partnership Program of CAS [1A1365KYSB20200008]
- Tianshan Innovation Team Program [2018D14001]
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The simple binary fluoride alpha-SnF2 exhibits excellent birefringent properties compared to YVO4 and TiO2, with a strong SCALP contributing to its large birefringence. The exploration of alpha-SnF2 birefringent crystal points towards the future search for superior birefringent materials.
The simple binary fluoride alpha-SnF2 is shown to be an excellent birefringent material with outstanding birefringence, about 14 times that of MgF2. Furthermore, it exhibits a shorter UV cutoff edge and easy crystal growth at ambient temperature compared to YVO4 and TiO2. A novel theoretical calculation mode was established to analyze the stereochemical-activity lone-pair (SCALP) contribution to the birefringence (SCB) based on the SCALP ' s strength and arrangement, and it was found that the large birefringence of alpha-SnF2 mainly benefits from well-aligned [SnF5] polyhedra with a strong SCALP. The exploration of the alpha-SnF2 birefringent crystal points out the direction of the future search for excellent birefringent materials.
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