EFFECT OF THE SUBSTITUTION OF Ga ON THE STRUCTURE AND MAGNETIC PROPERTIES OF Dy2Fe17 COMPOUND
LUO YOU-QUAN (罗有泉)a, LU GUO-RONG (卢国荣)a, ZHANG ZHI-YOU (张志友)b, LIANG BING (梁兵)c
a Department of Physics, University of Science and Technology of China, Hefei 230026, China; b Department of Physics, Yantai University, Yantai 264005, China; c Institute of Physics, Academia Sinica, Beijing 100080), China
Abstract Dy2Fe17-xGax (x = 0,1,2,3,4, 5 and 6) compounds were prepared by arc melting. These compounds are of single phase, having a hexagonal Th2Ni17-type structure fox x=0 and rhombohedral Th2Zn17-type structure for x≥1. The substitution of Ga for Fe in the Dy2Fe17 leads to a linear increase of unit-cell volumes. The saturation magnetization Ms at 1.5K is found to decrease linearly with increasing Ga concentration, from 65emu/g for x= 0 to 5emu/g for x = 6; and the Fe magnetic moment $\mu$Fe is almost independent of Ga concentration. The Curie temperature TC is found first to increase with increasing Ga content x, and goes through a maximum value of 559 K at about x = 3, then decreases. The sharp increase of TC at lower Ga content may result from the increase of unit cell volumes. Dy2Fe17-xGax compounds with x≤5 exhibit easy plane anisotropy at room temperature, and those with x = 6 possess easy-axis.
Received: 26 November 1994
Accepted manuscript online:
LUO YOU-QUAN (罗有泉), LU GUO-RONG (卢国荣), ZHANG ZHI-YOU (张志友), LIANG BING (梁兵) EFFECT OF THE SUBSTITUTION OF Ga ON THE STRUCTURE AND MAGNETIC PROPERTIES OF Dy2Fe17 COMPOUND 1995 Acta Physica Sinica (Overseas Edition) 4 457
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