以下为句子列表：
英文: 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.
中文: 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。
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英文: The results showed the compound belonged to tetragonal tungsten bronze structure with space group P4bm and unit cell parameters a = 1. 25020(3)nm, c = 0. 39704(2)nm and the dielectric constant and the dielectric loss were 644 and 0. 003 (at 25℃ and 1kHz).
中文: 结果表明Ba_5BiTi_3Nb_7O_(30)晶体属于四方钨青铜结构,空间群P4bm,晶胞参数a=1.25020(3)nm,c=0.39704(2)nm; 介电常数ε_r为644,介电损耗tanδ为0.3%(1kHz,25℃)。
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