Thermodynamic assessment for the Bi-Mn binary phase diagram in high magnetic fields

The thermodynamic calculations of the Bi-Mn binary phase diagram in high magnetic fields are carried out by the Computer Coupling of Phase Diagrams (CALPHAD) method. The magnetic total energy E-mag was estimated by calculating magnetization on the basis of the mean field theory. The calculated results show the significant change of the Bi-Mn phase diagram under magnetic fields, which were in good agreement with the experimental results of in-field thermal analysis performed by Mitsui et al. The calculation shows that the peritectic temperature T-p1 (BiMn + liquid -> BiMn1.08 + liquid) reached another peritectic temperature T-p2 (BiMn1.08 + liquid -> Mn + liquid) at 49 T, suggestingthat BiMn will form directly from Mn + liquid without forming BiMn1.08 by the heat treatment in B >= 49 T. (C) 2013 Elsevier B.V. All rights reserved.