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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 16    No. 6    December 2006

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Thermal expansion anomaly and spontaneous magnetostriction of Dy2AlFe14Mn2 compound
WANG Hai-yun(王海云)1, ZHAO Miao(赵 淼)2, GAO Yan(高 艳)2
ZHOU Yan(周 严)1, FU Bin(傅 斌)2, YAN Da-li(严达利)2

1. School of Materials Science and Technology, Hebei University of Technology, 
Tianjin 300130, China; 
2. Department of Physics, Tianjin Normal University, Tianjin 300074, China

Abstract: The structure and magnetic properties of Dy2AlFe14Mn2 compound were investigated by X-ray diffractometry and magnetization measurements. Dy2AlFe14Mn2 compound has a hexagonal Th2Ni17-type structure. Zero thermal expansion and negative thermal expansion were found in Dy2AlFe14Mn2 compound in the temperature range from 184 to 264 K, and from 264 to 383 K, respectively, by X-ray dilatometry. The spontaneous magnetostrictive deformations from 104 to 400 K were calculated. The results show that the spontaneous volume magnetostrictive deformation increases firstly with increasing temperature, and then decreases with further increasing temperature.

 

Key words: Dy2AlFe14Mn2 compound; thermal expansion; spontaneous magnetostriction; negative thermal expansion

ISSN 1672-7029
CN 43-1423/U

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