Structural and magnetic characterization of rhombohedral Ga1.2Fe0.8O3 ceramics prepared by high-pressure synthesis

The rhombohedral αα- Ga1.2Fe0.8O3 ceramics have been synthesized by using a high pressure technique at a pressure of 5 GPa and a temperature of 800 °C from orthorhombic εε- Ga1.2Fe0.8O3 ceramics, which were identified to be isostructural with αα- Fe2O3 and αα- Ga2O3. The low temperature magnetism has been studied for αα- Ga1.2Fe0.8O3, the saturation magnetization is 0.26μB/Fe at 5 K, and the Morin temperature has not been found. Moreover, it is most probable that the spin reorientation of αα- Ga1.2Fe0.8O3 has been found at 50 K resulted from the change of magnetic dipole anisotropy and single-ion anisotropy with temperature.