Near-zero thermal expansion in β-CuZnV2O7 in a large temperature range

We report a new type of near-zero thermal expansion material β-CuZnV2O7 in a large temperature range from 173 K to 673 K.It belongs to a monoclinic structure(C2/c space group)in the whole temperature range.No structural phase transition is observed at atmospheric pressure based on the x-ray diffract...

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Bibliographic Details
Published in:Chinese physics B 2022-03, Vol.31 (4), p.627-633
Main Authors: Hao, Yaguang, Xie, Hengli, Zeng, Gaojie, Yuan, Huanli, Hu, Yangming, Guo, Juan, Gao, Qilong, Chao, Mingju, Ren, Xiao, Liang, Er-Jun
Format: Article
Language:English
Subjects:
CuZnV2O7
expansion mechanism
negative thermal expansion material
Raman spectrum
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Summary:We report a new type of near-zero thermal expansion material β-CuZnV2O7 in a large temperature range from 173 K to 673 K.It belongs to a monoclinic structure(C2/c space group)in the whole temperature range.No structural phase transition is observed at atmospheric pressure based on the x-ray diffraction and Raman experiment.The high-pressure Raman experiment demonstrates that two structural phase transitions exist at 0.94 GPa and 6.53 GPa,respectively.The mechanism of negative thermal expansion in β-CuZnV2O7 is interpreted by the variations of the angles between atoms intuitively and the phonon anharmonicity intrinsically resorting to the negative Grüneisen parameter.
ISSN:1674-1056
DOI:10.1088/1674-1056/ac3393