液态Bi－Te和Bi－Se系合金的电阻率与金属－非金属转变

液态Bi－Te和Bi－Se系合金的电阻率与金属－非金属转变 ELECTRICAL RESISTIVITY OF LIQUID Bi-Te AND Bi-Se ALLOYS AND METAL-NONMETAL TRANSITION 金准智 1 first-author 胡立新 1 邹宪武 1 郭怀喜 1 向梅芝 1 武汉大学物理学系 武汉大学物理学系 Department of Physics, Wuhan University Department of Physics, Wuhan University 测量了含Ｔｅ４０％～７０％（ａｔ．）的液态Ｂｉ－Ｔｅ合金在７００～８５０℃和含Ｓｅ４０％～６５％（ａｔ．）的液态Ｂｉ－Ｓｅ合金在７００～９００℃的电阻率．得到在所述成分范围内，液态Ｂｉ－Ｔｅ合金保持金属导电性；而对于液态Ｂｉ－Ｓｅ合金，当成分接近Ｂｉ２Ｓｅ３配比时，发生金属－非金属转变．从原子间键合方式和能态特征，解释了液态Ｂｉ－Ｓｅ合金发生金属－非金属转变，而液态Ｂｉ－Ｔｅ合金保持金属性的原因． We have measured the electrical resistivities of liquid Bi-Te alloy of 40%￣70% （at.）of Te in the range between 700 and 850℃, and ones of liquid Bi-Se alloy of 40% ￣65 % （at.） of Se between 700 and 900t. In this range of compositions, the liquid Bi-Te alloy shows metallic behavior and the liquid Bi-Se alloy possesses metal-nonmetal transition as the composition closes to the stoichiometric one of Bi2Se3.The difference of the electrical conductivity behaviors of these two alloy systems is explained by the types of bonds and the character of energy states. 液态合金 Bi－Te Bi－Se 电阻率 金属－非金属转变 TG146.17 国家自然科学基金(61672102) 1995-03-01 2021-04-01 3