Structural and magnetic properties of Sm2Fe17-xTxM (T = Co, Ti; M = Al, Si) compounds
Publication in refereed journal

香港中文大學研究人員

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摘要The structural and magnetic properties of off-stoichiometric 2: 17-type compounds Sm2Fe17-xTxM (T=Co, Ti; M=Al, Si; x=0-4) were studied by x-ray powder diffraction, thermomagnetic analysis, and magnetic measurements. All these compounds were of the Th2Zn17 type. The substitution of Co or Ti for Fe, and the addition of Si or Al into the Sm2Fe17 did not alter the rhombohedral structure. The Co replacement increased the Curie temperature T-c due to the strong coupling between Fe and Co. A small substitution of Ti also led to an increase of T-c. However, when x>3, the exchange coupling became less effective as the separation between the Fe atoms became large, and T-c decreased. The maximum T-c = 713 K was found in Sm2Fe17-xCoxSi when x=4. As for the saturation magnetization M-s, Sm2Fe17-xTixAl had its M-s decreased monotonically with increasing Ti, while M-s of other compounds increased first and then decreased with the content of Co or Ti. The maximum M-s = 159 emu/g was recorded in Sm2Fe15Co2Al. To make use of these compounds as permanent magnets, Sm2Fe15Co2Si is preferred because it has T-c = 641 K and M-s = 142 emu/g. The dual substitutions of Fe by using Co or Ti, and by Al or Si to improve T-c and M-s of Sm2Fe17, are more effective than using single substitution. (C) 1999 American Institute of Physics. [S0021-8979(99)56508-0].
著者Ren ZY, Lee WY, Qin CD, Ng DHL, Ma XY
會議名稱43rd Annual Conference on Magnetism and Magnetic Materials
會議開始日09.11.1998
會議完結日12.11.1998
會議地點MIAMI
期刊名稱Journal of Applied Physics
出版年份1999
月份4
日期15
卷號85
期次8
出版社AMER INST PHYSICS
頁次4672 - 4674
國際標準期刊號0021-8979
電子國際標準期刊號1089-7550
語言英式英語
Web of Science 學科類別Physics; Physics, Applied; PHYSICS, APPLIED

上次更新時間 2021-23-02 於 00:59