Syntheses and magnetic properties of Tb{sub 3}Fe{sub 29{minus}x}Cr{sub x} compounds
- State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100080, Peoples Republic of (China)
- Department of Physics, Beijing Normal University, Beijing 100875, Peoples Republic of (China)
Compounds with composition Tb{sub 3}Fe{sub 29{minus}x}Cr{sub x} (x=1.0, 1.5, 2.0, and 3.0) have been synthesized successfully. The lattice parameters, the unit cell volume, the density, and the atomic positions of these compounds have been derived from x-ray diffraction patterns. The Curie temperature, the saturation magnetization, and the anisotropy field at 4.2 K and room temperature of these compounds are also obtained. The saturation magnetization of Tb{sub 3}Fe{sub 29{minus}x}Cr{sub x} decreases but the anisotropy field increases linearly with increasing Cr concentration at 4.2 K and room temperature. A spin reorientation of the easy-magnetization direction occurs at around 180 K and a first-order magnetization process is observed in magnetic fields in the range between 2.3 and 1.6 T at room temperature for the Tb{sub 3}Fe{sub 29{minus}x}Cr{sub x} compounds. The relationship between the hexagonal R{sub 2}T{sub 17} (2:17H), tetragonal RT{sub 12{minus}x}T{sub x}{sup {prime}} (1:12), and monoclinic R{sub 3}T{sub 29{minus}x}T{sub x}{sup {prime}} (3:29) structures are obtained through the matrix transformation of reciprocal vectors in a Cartesian coordinate system. Based on the experimental results of the saturation magnetization and the average hyperfine field of Tb{sub 3}Fe{sub 29{minus}x}Cr{sub x} compounds, the average Fe atomic magnetic moments in the range 0{le}x{le}3 can be expressed as an empirical formula: M{sub Fe}=M{sub Fe}(1){minus}x[M{sub Fe}(1){minus}M{sub Fe}(2)]/X{sub max} where M{sub Fe}(1) is the iron moment in 2:17 compounds, M{sub Fe}(2) is the iron moment in 1:12 compounds and X{sub max}=3 is the highest Cr concentration included. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 632634
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 14 Vol. 56; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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