Title :
Oxygen absorption by the Fe17Sm2 phase
Author :
Gama, S. ; Colucci, C.C. ; Ribeiro, C.A. ; Sanjurjo, N.L. ; Campos, C. ; de Morais, E.
Author_Institution :
Inst. de Fisica Gleb Wataghin, Univ. Estadual de Campinas, Sao Paulo, Brazil
fDate :
11/1/1995 12:00:00 AM
Abstract :
The results of oxygen absorption in temperatures ranging from 200 to 500°C are reported. It was observed that the oxygen saturation limit is temperature dependent, being of 3 atoms per formula unit (at/fu) at 200°C, 12.8 at/fu at 300°C, 20.3 at/fu at 400°C and 28.5 at/fu at 500°C. This implies that above 200°C the phase is deeply altered by oxygen absorption. Samples with absorption at 200°C were studied as prepared and heat treated at 500°C/40 h. The results show that the heat treated samples consist of Fe17Sm2, Fe and Sm2O3. Metallographic examination and susceptibility data support the hypothesis that the as prepared samples consist of a mixture of Fe17Sm2 and interstitial Fe17Sm2 O3
Keywords :
X-ray diffraction; ferromagnetic materials; heat treatment; interstitials; iron alloys; local moments; magnetic susceptibility; oxygen; samarium alloys; thermomagnetic effects; 200 to 500 C; Fe17Sm2O; Fe17Sm2Ox; O interstitial absorption; X-ray diffraction; heat treatment; magnetic susceptibility; saturation limit; temperature dependence; thermomagnetic analysis; Argon; Electromagnetic wave absorption; Inductors; Iron; Magnetic analysis; Microstructure; Oxygen; Samarium; Temperature; X-ray diffraction;
Journal_Title :
Magnetics, IEEE Transactions on
