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Crystal structure and magnetic properties of melt spun Sm(Co,V)7 ribbons.

Authors :: Hsieh, C. C.
Chang, H. W.
Chang, C. W.
Guo, Z. H.
Yang, C. C.
Chang, W. C.
Source :: Journal of Applied Physics; Apr2009, Vol. 105 Issue 7, p07A705-07A707, 3p, 1 Black and White Photograph, 1 Chart, 3 Graphs
Publication Year :: 2009
Abstract: The crystal structure and magnetic properties of melt spun Sm(Co,V)<subscript>7</subscript> ribbons have been investigated. It was found that SmCo<subscript>7-x</subscript>V<subscript>x</subscript> ribbons may crystallize in pure TbCu<subscript>7</subscript>-type structure for x=0.1–0.3 spun at a high wheel speed of 40 m/s. The structure refinement results show that the doping element V prefers to occupy the 2e site of TbCu<subscript>7</subscript>-type structure. Besides, transmission electron microscopy images show that with increasing V content, the grain size was refined from 200–400 nm for x=0.1 to 40–100 nm for x=0.3. As a result, the intrinsic coercivity enhances effectively from 1.9 kOe for SmCo<subscript>7</subscript> ribbon to 11.5 kOe for SmCo<subscript>6.7</subscript>V<subscript>0.3</subscript> ribbon. It is also verified that a slight addition of C to SmCo<subscript>7-x</subscript>V<subscript>x</subscript> could further refine the microstructure, resulting in the improvement of the magnetic properties of SmCo<subscript>7-x</subscript>V<subscript>x</subscript> ribbons. The optimal magnetic properties of σ<subscript>r</subscript>=58.7 emu/g, <subscript>i</subscript>H<subscript>c</subscript>=13.5 kOe, and (BH)<subscript>max</subscript>=9.3 MG Oe can be obtained for SmCo<subscript>6.9</subscript>V<subscript>0.1</subscript>C<subscript>0.1</subscript> ribbon. [ABSTRACT FROM AUTHOR]