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摘要
Intermetallic compounds of NdMn6-xFeSn6 (0 less than or equal to x less than or equal to 2.0) were studied by means of x-ray and neutron diffraction techniques and SQUID magnetic measurements in the temperature range of 30-400 K. The substitution of iron for manganese leads to a phase transition whereby NdMn6Sn6 with the HoFe6Sn6 structure (space group Immm) changes to TbFe6Sn6 (space group Cmcm) for NdMn6-xFexSn6 with x greater than or equal to 0.5. The iron atoms prefer to occupy the 8g sites at iron content x < 2.0 due to the longest Mn/Fe-Sn bond distance. The Curie temperature (T-C) increases from x = 0 to 1.5 and then decreases for the larger iron content. The magnetic moment of the iron sublattice couples ferromagnetically with the manganese and neodymium moments for the x < 2.0 samples. Spin reorientation is observed in samples with iron content up to 1.5, and the spin reorientation temperature (T-S) increases with increasing iron content. Except for NdMn4Fe2Sn6, the easy direction of magnetization for all samples is parallel and perpendicular to the (bc) plane of the unit cell at 300 and 30 K, respectively. The easy direction of magnetization for NdMn4Fe2Sn6 is parallel to the a-axis in the entire temperature range mentioned above, as a result of the anisotropic contraction of the unit cell along the (bc) plane.
- 出版日期2004-8-4
