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The Structure, Vibrational Spectra, and Thermal Expansion Study of AVO4 (A=Bi, Fe, Cr) and Co2V2O7

by Xiaoke He 1,*, Chenjun Zhang 2,3 and Ding Tian 1
1
School of Electric Power, North China University of Water Resources and Electric Power, 450045, China
2
National Research Center of Pumps, Jiangsu University, Zhenjiang, 212013, China
3
School of Mechanical Engineering, Luoyang Institute of Science and Technology, Luoyang, 471023, China
*
Author to whom correspondence should be addressed.
Materials 2020, 13(7), 1628; https://doi.org/10.3390/ma13071628
Received: 9 February 2020 / Revised: 23 March 2020 / Accepted: 27 March 2020 / Published: 1 April 2020
Vanadate is an important functional material. It has been widely studied and applied in luminescence and photocatalysis. Vanadium compounds have been synthesized to investigate the thermal expansion properties and structure. Both BiVO4 and Co2V2O7 are monoclinic at room temperature, FeVO4’s crystal structure is triclinic, and CrVO4 is orthorhombic. The relatively linear, thermal-expansion, and temperature-dependent Raman spectroscopy results showed that the phase transition of BiVO4 occurred at 200 to 300 °C. The coefficient of thermal expansion (CTE) of Co2V2O7 was larger than that of the monoclinic structure BiVO4. The CTE of the tetragonal structure of BiVO4 was 15.27 × 10−6 °C−1 which was the largest CTE in our measurement results, and the CTE of anorthic structure FeVO4 was 2.84 × 10−6 °C−1 and was the smallest. View Full-Text
Keywords: vanadium; Raman spectroscopy; thermal expansion; crystal structure vanadium; Raman spectroscopy; thermal expansion; crystal structure
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He, X.; Zhang, C.; Tian, D. The Structure, Vibrational Spectra, and Thermal Expansion Study of AVO4 (A=Bi, Fe, Cr) and Co2V2O7. Materials 2020, 13, 1628.

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