Differential thermal analysis (DTA) equipment for utilization in a high magnetic field of 45 T was developed. From the DTA experiments, the decomposition temperature (MnBi → Mn1.08Bi+liquid: 632 K at zero field) T t was found to increase linearly at a rate of 2 KT-1 in fields up to 18 T and to deviate from that linear increase above 20 T. In addition, the peritectic temperature (Mn1.08Bi → Mn + liquid: 721 K at zero field) T m was slightly increased by applying a magnetic field. At a magnetic field of 45 T, T t and T m reached 714 K and 726 K, respectively. The behaviors of T t and T m for MnBi and Mn1.08Bi under high magnetic fields are discussed, and the magnetic energies are calculated on the basis of mean field theory.
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