Artículos de revistas
Magnetic characterization of Mn5SiB2 and Mn5Si3 phases
Registro en:
Journal Of Magnetism And Magnetic Materials. Elsevier Science Bv, v. 321, n. 17, n. 2578, n. 2581, 2009.
0304-8853
WOS:000266436400016
10.1016/j.jmmm.2009.03.067
Autor
de Almeida, DM
Bormio-Nunes, C
Nunes, CA
Coelho, AA
Coelho, GC
Institución
Resumen
In this work the Mn5Si3 and Mn5SiB2 phases were produced via arc melting and heat treatment at 1000 degrees C for 50 h under argon. A detailed microstructure characterization indicated the formation of single-phase Mn5Si3 and near single-phase Mn5SiB2 microstructures. The magnetic behavior of the Mn5Si3 phase was investigated and the results are in agreement with previous data from the literature, which indicates the existence of two anti-ferromagnetic structures for temperatures below 98 K. The Mn5SiB2 phase shows a ferromagnetic behavior presenting a saturation magnetization M-s of about 5.35 x 10(5) A/m (0.67 T) at room temperature and an estimated Curie temperature between 470 and 490 K. In addition, AC susceptibility data indicates no evidence of any other magnetic ordering in 4-300 K temperature range. The magnetization values are smaller than that calculated using the magnetic moment from previous literature NMR results. This result suggests a probable ferrimagnetic arrangement of the Mn moments. (C) 2009 Elsevier B. V. All rights reserved. 321 17 2578 2581