therein, a transition from the monoclinic to the tetragonal phase occurrs at the temperature range from to K, and the tetragonal to the cubic phase likely occurrs above 7 K which leads to the jumps at conductivity.
therein, a transition from the monoclinic to the tetragonal phase occurrs at the temperature range from to K, and the tetragonal to the cubic phase likely occurrs above 7 K which leads to the jumps at conductivity.
电导率随温度变化曲线可分为段,其中,在 ~ K范围内发生单斜相向四方相的转变, 7 K以上存在四方相向立方相的转变,导致电导率的跳跃升高。