Crystallographic transformations of rapidly quenched Sm{sub 10}Fe{sub 90{minus}x}Ti{sub x} and magnetic properties of their nitrides
- Institute of Metal Research, Academic Sinica, Wenhua Road 72, 110015 Shenyang, Peoples Republic of (China)
Sm{sub 10}Fe{sub 90{minus}x}Ti{sub x} alloys (x=0, 1, 3, 4, 5, 6, 8, 10) were prepared by rapid quenching and sequent annealing. Structural transformations from amorphous, metastable-to-equilibrium phases, and magnetic properties of their nitrides were systematically investigated. A CaCu{sub 5}-type metastable phase was formed for 0{le}x{le}10 as the crystallization of the amorphous alloys occurred below 700{degree}C. The CaCu{sub 5}-type structure is transformed into a TbCu{sub 7}-type one with increased annealing temperature (above 700{degree}C). These alloys have different structures including Th{sub 2}Zn{sub 17} type for 0{le}x{le}3, TbCu{sub 7} type for 3{lt}x{lt}6, and ThMn{sub 12} type for 6{le}x{le}10, at high annealing temperatures (above 950{degree}C). Nitrogenation was carried out at 460{degree}C for 6 h. The best hard magnetic properties are obtained after nitriding for x=3. It gives {sub i}H{sub c}=17.6 kOe, 4{pi}M{sub r}=7.7 kG, and (BH){sub max}=6.8 MGOe for the TbCu{sub 7}-type phase and {sub i}H{sub c}=8.6 kOe, 4{pi}M{sub r}=8.4 kG, and (BH){sub max}=10.2 MGOe for the CaCu{sub 5}-type one. Although the coercivity of the CaCu{sub 5}-type phase is lower than that of the TbCu{sub 7}-type one, enhanced remanence of the former has been observed. {copyright} {ital 1997 American Institute of Physics.}
- OSTI ID:
- 550453
- Journal Information:
- Journal of Applied Physics, Vol. 82, Issue 12; Other Information: PBD: Dec 1997
- Country of Publication:
- United States
- Language:
- English
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