Eur. Phys. J. Appl. Phys.
Volume 33, Number 2, February 2006
|Page(s)||103 - 107|
|Section||Magnetism and Superconductivity|
|Published online||08 February 2006|
Thermal expansion anomaly and magnetic properties of Nd2AlFe16−xMnx compounds
Department of Physics, Tianjin Normal University, Tianjin, 300074, P.R. China
2 Department of Physics, Shandong University, Jinan, 250100, P.R. China
Corresponding author: email@example.com
Revised: 13 September 2005
Accepted: 25 October 2005
Published online: 8 February 2006
The structural and magnetic properties of Nd2AlFe16−xMnx (x = 1, 2, 3, 4, and 5) compounds have been investigated by means of X-ray diffraction and magnetization measurements. The Nd2AlFe16−xMnx compounds have a rhomhedral Th2Zn17-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 Nd2AlFe15Mn compound. In the magnetic state, the thermal expansion coefficients of Nd2AlFe16−xMnx 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.
PACS: 87.59.Dj – Angiography / 75.30.Et – Exchange and superexchange interactions / 75.60.Ej – Magnetization curves, hysteresis, Barkhausen and related effects
© EDP Sciences, 2006
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