Abstract
The structural and magnetic properties of Nd 2 AlFe 16− x Mn x ( x = 1, 2, 3, 4, and 5) compounds have been investigated by means of X-ray diffraction and magnetization measurements. The Nd 2 AlFe 16− x Mn x compounds have a rhomhedral Th 2 Zn 17 -type structure. There exist an anisotropic strong spontaneous magnetostriction in magnetic state and a negative thermal expansion near their Curie temperatures. The nearly zero thermal expansion coefficient is found over a broad temperature range including room temperature from 103 to 342 K for Nd 2 AlFe 15 Mn compound. In the magnetic state, the thermal expansion coefficients of Nd 2 AlFe 16− x Mn x compounds increase with the increasing Mn concentrations x . Mn concentration dependences of the lattice parameters and unit-cell volume, the spontaneous magnetostrictive deformation, the Curie temperature, and the saturation magnetization have been discussed.
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