Thermal Analysis in High Magnetic Field: Magnetic Field Effect on Phase Equilibrium

The magnetic field effects on the synthesis process, decomposition process, and the phase equilibrium of materials have been investigated via thermal analysis experiments in high magnetic fields (HF-DTA). In this review, the thermal analysis systems in high magnetic fields are described. The typical results obtained by HF-DTA are presented. The magnetic field effects on the synthesis process of the high-Tc superconductors and the phase equilibrium of ferromagnetic materials are described. The results of HF-DTA experiments show that the phase equilibriums of Bi-Mn system and Fe-C alloys are drastically changed by applying high magnetic fields. In addition, HF-DTA experiments were performed for various compositions of Bi-Mn alloys. BiMn binary phase diagrams in high magnetic fields were shown. The magnetic field effects on the phase equilibrium were discussed in the basis of Zeeman energy of the ferromagnetic phase.