Structural, magnetic and magnetostrictive studies of Tb0.27Dy0.73(Fe1-xAlx)2

• Published in: Journal of alloys and compounds 1993-01, Vol.190 (2), p.255-258
• Main Authors: Guo, Hui-qun, Yang, Hong-ying, Shen, Bao-gen, Yang, Lin-yuan, Li, Ru-qi
• Format: Article
• Language: English
• Subjects: Applied sciences; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Magnetic properties and materials; Magnetomechanical and magnetoelectric effects, magnetostriction; Metals. Metallurgy; Physics
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/0925-8388(93)90407-E

Measurements of magnetic properties, X-ray diffraction and magnetostriction were made on Tb0.27Dy0.73(Fe1--xAlx)2 (x = 0.1, 0.2, ..., 0.7) compounds. It was found that the system has the cubic MgCu2 structure over almost the whole (Fe,Al) concentration range investigated, except for a narrow intermediate range (x = 0.4-0.6) where the hexagonal MgZn2 structure appears. With increasing Al content x, the lattice constant a increases linearly with x. The first replacement of Fe results in a marked decrease in the Curie temperature, which is followed by a slight decrease in Tc with x. A linear decrease in magnetostriction of | lambda ||-- lambda perpindicular to | at room temperature with x was also observed from 1530 x 10 exp --6 for x = 0 to 36 x 10 exp --6 for x = 0.3. The saturation magnetization sigma s exhibits a complex concentration dependence in the Tb0.27Dy0.73(Fe1--xAlx)2 system: in the range x < 0.5, sigma s increases linearly with x and, for x = 0.5-0.6, sigma s decreases and then increases again. An enhancement of the magnetic "hardness" in this system was also observed at low temperature.