液态Hg－Na和Te－Se合金电输运性质及金属－非金属转变的研究  

ELECTRICAL TRANSPORT OF LIQUID Hg-Na AND Te-Se ALLOYS AND METAL-NONMETAL TRANSITION

作　　者：任大志[1] 冯启星[1] 金准智[1] 汤五丰[1] 邹宪武[1] 

机构地区：[1]武汉大学物理学系

出　　处：《武汉大学学报（自然科学版）》1995年第5期605-610,共6页Journal of Wuhan University(Natural Science Edition)

基　　金：国家自然科学基金

摘　　要：系统测量了液态Ｈｇ－Ｎａ及Ｔｅ－Ｓｅ合金的电阻率和热电势，发现液态Ｈｇ－Ｎａ合金的电阻率随成分变化虽有反常行为，但没有金属－非金属转变；而液态Ｔｅ－Ｓｅ合金的电阻率随成分变化并无反常出现，但当Ｓｅ成分大于３０％（ａｔ．）时，出现金属一非金属转变．本文考虑了液态Ｈｇ－Ｎａ合金中有Ｈｇ２Ｎａ瞬时短程序形成的因素，采用Ｆａｂｅｒ－Ｚｉｍａｎ理论，计算了液态Ｈｇ－Ｎａ合金的电阻率，计算结果与上述实验测量值符合很好．同时也定性解释了液态Ｈｇ－Ｎａ合金热电势极小值及液态Ｔｅ－Ｓｅ合金在大于３０％（ａｔ．）Ｓｅ时出现金属－非金属转变的原因．The electrical resistivity and thermoelectric power of liquid Hg-Na and Ti-Se alloys have been measured. It is found that the composition dependence of resistivity of liquid Hg-Na alloy Shows anomalous behaviour and no metal-nonmetal transition. On the contrary,this dependence for liquld Te-Se alloy shows no anomalous behaviour but metalwnonmetal transition. Using Faber-Ziman theory and considering the formation of Hg,Na,the transient short rang ordered structure,In liquid Hg-Na alloy,the electrical resistivity is calculeted and it is in agreement very well with experiments. The minimum of the composition dependence of thermoelectric power for liquid Hg-Na alloy and the metal--nonmetal transition for liquid Te-Se alloy containing greater than 30at. % Se are explained qualitatively.

关 键 词：液态合金 电阻率 热电势 汞钠合金 碲硒合金 

分 类 号：TG131[一般工业技术—材料科学与工程]