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

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...

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Bibliographic Details
Published in:Materials 2020-04, Vol.13 (7), p.1628
Main Authors: He, Xiaoke, Zhang, Chenjun, Tian, Ding
Format: Article
Language:English
Subjects:
Asymmetry
Bismuth oxides
Crystal structure
Functional materials
Letter
Phase transitions
Photocatalysis
Raman spectroscopy
Room temperature
Sintering
Spectrum analysis
Symmetry
Temperature dependence
Thermal expansion
Vanadates
Vanadium compounds
Vibrational spectra
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Summary: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.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma13071628