Structural and physical properties evolution of BaIr 1−xMn xO 3 solid solutions synthesized by high-pressure sintering

Abstract

The BaIr 1− x Mn x O 3 (0.0≤ x≤1.0) solid solutions were synthesized by using the solid-state chemical method and high pressure sintering in the pressure range 0–5 GPa. According to the pressure–composition “phase diagram” at 1000 °C, the 9M BaIr 1− x Mn x O 3 transforms to the 6M form at 5 GPa and x≤1/6. In the x range 0.5–1.0, it transforms to the 9R form in a large pressure range. For the 9M BaIrO 3, the Mn ions substitution for Ir ions enhances the semiconducting property, and reduces the weak ferromagnetism. When x is larger than 1/3, the 9M/9R BaIr 1− x Mn x O 3 behave spin–glass-like state at low temperature, with the glass transition temperature T g about 60 K. For the 6M BaIrO 3, the Mn ions doping results in that it transforms to insulator and spin–glass-like magnetism from the initial paramagnetic metal.