Near-zero thermal expansion in β-CuZnV2O7 in a large temperature range
Near-zero thermal expansion in β-CuZnV2O7 in a large temperature range
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β-CuZnV2O7 在大温度范围内热膨胀接近于零
DOI：
10.1088/1674-1056/ac3393
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发表时间：
2022
影响因子：
1.7
通讯作者：
Er-Jun Liang
中科院分区：
文献类型：
--
作者：
Yaguang Hao;Hengli Xie;Gaojie Zeng;Huanli Yuan;Yangming Hu;Juan Guo;Qilong Gao;Mingju Chao;Xiao Ren;Er-Jun Liang
本文报道了一种新型的近零热膨胀材料β-CuZnV2O7，其温度范围为173 ~ 673 K。在整个温度范围内属于单斜结构（C2/c空间群）。根据x射线衍射和拉曼实验，在常压下未观察到结构相变。高压拉曼实验表明，在0.94 GPa和6.53 GPa处，存在两个结构相变。β-CuZnV2O7的负热膨胀机理直观地由原子间角度的变化和声子的非调和性内在地归结为负格律<s:1>尼森参数来解释。
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.