Crystallization and magnetic properties of rapidly thermal annealed amorphous Sm sub(2)Fe sub(15)Ga sub(2)C sub(2) melt-spun ribbons

The amorphous Sm sub(2)Fe sub(15)Ga sub(2)C sub(2) ribbons were rapidly thermal annealed at various temperatures for various times. From the X-ray diffraction patterns, two phases, i.e. 2:17 phase and alpha -Fe, were always found when the ribbons were annealed at temperature above 700 degree C. The...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 1999-01, Vol.202 (2), p.445-450
Main Authors: Tung, I-Chung, Chao, Ling-Jung, Chin, Tsung-Shune, Yao, Shyue-Yen, Zhang, Hong-wei, Zhang, Shao-ying, Shen, Bao-gen
Format: Article
Language:English
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Summary:The amorphous Sm sub(2)Fe sub(15)Ga sub(2)C sub(2) ribbons were rapidly thermal annealed at various temperatures for various times. From the X-ray diffraction patterns, two phases, i.e. 2:17 phase and alpha -Fe, were always found when the ribbons were annealed at temperature above 700 degree C. The demagnetization curves also verified this two-phase behavior. However, from the TEM studies, only 2:17 phase was found. This led to the suggestion that the alpha -Fe precipitates were caused by the oxidation of Sm and only took place at the surface of the annealed ribbons. Moreover, from the TEM images, crystallization of 2:17 phase was found to begin at about 600 degree C. The ribbons annealed at 700 or 900 degree C for 1 min showed well-defined grains in the absence of alpha -Fe. Their grain sizes were measured to be about 100 nm for 700 degree C x 1 min and 250 nm for 900 degree C x 1 min, respectively. It was thus suggested that the Sm sub(2)Fe sub(15)Ga sub(2)C sub(2) 2:17 type structure obtained from the melt-spinning technique remains stable up to at least 900 degree C.
ISSN:0304-8853