Phase Transition and Negative Thermal Expansion Property of ZrMnMo3O12
Phase Transition and Negative Thermal Expansion Property of ZrMnMo3O12
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ZrMnMo3O12的相变和负热膨胀性能
DOI：
10.1088/0256-307x/33/4/046503
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发表时间：
2016-04-01
影响因子：
3.5
通讯作者：
Liang, Er-Jun
中科院分区：
文献类型：
--
作者：
Ge, Xiang-Hong;Mao, Yan-Chao;Liang, Er-Jun
提出了一种新型的负热膨胀材料ZrMnMo3O12。用变温X射线衍射和拉曼光谱研究了材料的相变温度和热膨胀系数。结果表明，ZrMnMo3O12在298~358 K为单斜晶系，空间群为P21/a（No.14），在363 K以上转变为正交晶系，空间群为Pnma（No.62）。从XRD精修的结果得到的线性CTE为− 2.80 × 10 − 6 K − 1，从363到873 K。用热膨胀仪测得的圆柱体陶瓷的热膨胀系数在373~773 K范围内约为− 4.7 × 10 − 6 K − 1。
A novel material of ZrMnMo3O12 with negative thermal expansion is presented. The phase transition temperature and coefficient of thermal expansion (CTE) are investigated by temperature-dependent x-ray diffraction and Raman spectra. It is shown that ZrMnMo3O12 adopts monoclinic structure with space group P21/a (No. 14) from 298 to 358 K and transforms to orthorhombic with space group Pnma (No. 62) above 363 K. The linear CTE obtained from the results of XRD refinement is −2.80 × 10−6 K−1 from 363 to 873 K. The CTE of the bulk cylinder ceramic measured by a thermal dilatometer is −4.7 × 10−6 K−1 from 373 to 773 K approximatively.