Magnetic properties of ball-milled TbFe2 and TbFe2B

[摘要] The magnetic properties of ball-milled TbFe₂ and TbFe₂B were studied by magnetization measurements. X-ray diffraction studies on TbFe₂B showed that boron occupied interstitial position in the crystal structure, just as hydrogen did. The value of the saturation magnetization of TbFe₂B was found to be smaller than that of TbFe₂. This is explained on the basis of a charge transfer between the boron atoms and the 3d band of Fe. The anisotropy of TbFe₂B was found to be large compared to that of TbFe₂. X-ray diffractograms for the ball milled samples showed that after 80 h of milling, a predominantly amorphous phase was obtained. TbFe₂B was found to undergo easy amorphization compared to TbFe₂. Magnetization of TbFe₂ was found to decrease rapidly with initial milling hours and was found to be constant with further hours of milling. TbFe₂B exhibited an anomalous behaviour with an increase in moment with milling hours and this may be due to the segregation of ð›�?-Fe.

[学科分类] 材料工程

[关键词] Amorphous materials;intermetallic compounds;magnetic materials;magnetic properties.