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利用x射线衍射及磁测量手段研究了Ho2AlFe16-xMnx系列化合物的结构.结果表明，该系列化合物具有Th2Ni17型结构；随着x的增加，化合物的单胞体积呈现非线性的变化，结合磁测量结果分析认为，在化合物的磁相变点附近存在较大的正的本征磁致伸缩.在160—285K温度范围内对Ho2AlFe14Mn2化合物进行的变温x射线衍射研究表明，该化合物在其居里点附近(220—270K)具有负热膨胀性质，其平均热膨胀系数为-14×10-4/K.
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关键词:
- Ho2AlFe16-xMnx化合物 /
- 负热膨胀 /
- 本征磁致伸缩
The structure properties of Ho2AlFe16-xMnx compounds have been investigated by means of x-ray diffraction and magnetic measurements. The Ho2AlFe16-xMnx compounds have a hexagonal Th2Ni17-type structure. Their unit-cell volumes increase nonlinear with increasing x. This implies there is a positive spontaneous volume magnetostriction in the magnetic state of these compounds. x-ray diffraction of the Ho2AlFe14Mn2 compound from 160 to 285 K shows that there appears a negative coefficient of thermal expansion from 220 to 270K and the average thermal expansion is -14×10-4·K-1.
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