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Thermal expansion anomaly and magneticproperties of Nd2AlFe16−x Mnx compounds

Published online by Cambridge University Press:  08 February 2006

Y. Hao ,
M. Zhao ,
Y. Zhou  and
J. Hu
Y. Hao*
Affiliation:
Department of Physics, Tianjin Normal University, Tianjin, 300074, P.R. China
M. Zhao
Affiliation:
Department of Physics, Tianjin Normal University, Tianjin, 300074, P.R. China
Y. Zhou
Affiliation:
Department of Physics, Tianjin Normal University, Tianjin, 300074, P.R. China
J. Hu
Affiliation:
Department of Physics, Shandong University, Jinan, 250100, P.R. China
*
[email protected]
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Abstract

The structural and magnetic properties of Nd2AlFe16−x Mnx (x = 1, 2, 3, 4, and 5) compounds have been investigated by means of X-ray diffraction and magnetization measurements. The Nd2AlFe16−x Mnx 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−x Mnx 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.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 33 , Issue 2 , February 2006 , pp. 103 - 107
Copyright
© EDP Sciences, 2006

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