Negative thermal expansion of the Ho2AlFe14Mn2 compound

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Abstract
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 -14×10-4·K-1.

Keywords:
Ho2AlFe14Mn2 compound /

negative thermal expansion /

spontaneous volume magnetostriction
Authors and contacts
Hao Yan-Ming²,

Cui Chun-Xing¹,

Meng Fan-Bin¹

(1)河北工业大学材料学院，天津 300130; (2)天津师范大学物理系，天津 300074
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