Bi–Mn Binary Phase Diagram in High Magnetic Fields

Abstract

To examine magnetic field effects on the Bi–Mn equilibrium phase, a high-magnetic fields differential thermal analysis (HF-DTA) was performed for fields up to 18 T and temperatures ranging from 300 to 753 K. For zero field, the peritectic temperatures T_p1 (BiMn_1.08 + Bi-rich liquid → BiMn) and T_p2 (αMn + Bi-rich liquid → BiMn_1.08), and the eutectic temperature T_E (the Bi-rich liquid → Bi solid + BiMn) were determined to be 632, 721 and 538 K, respectively. The Bi–Mn phase diagram at 18 T was obtained, which showed that T_p1 increases with increasing magnetic fields at the rate of 2 K T⁻¹. Furthermore, the liquidus boundary temperature T_liq between BiMn_1.08 + liquid and Bi-rich liquid was found to increase nonlinearly with increasing magnetic field.