New cobalt-based intermetallic compound Co2VMn with B2 structure and phase equilibria in the Co–V–Mn ternary system

Abstract The phase equilibria in the Co–V–Mn ternary system, the magnetic properties and the phase stability of the new ternary intermetallic compound Co 2 VMn were investigated by means of electron probe microanalyzer, X-ray diffraction, differential scanning calorimetry and the vibrating sample magnetometer. Four isothermal sections of the Co–V–Mn ternary system at 1073 K, 1273 K, 1373 K and 1473 K were experimentally established, and a new ternary intermetallic compound named Co 2 VMn was found in the Co–V–Mn system. The Curie temperature of the Co 2 VMn phase was found to be about 670 K. In addition, the saturation magnetization at room temperature for alloy with B2 structure was measured to be about 145.1 emu/g, while the coercivity was about 2.8 Oe. The newly determined phase equilibria in this system will provide important information for the development of the Co-based functional materials and for the thermodynamic assessment of the Co–V–Mn ternary system.