液态InSb电阻率和热电势与温度的关系

利用直流四电极法和微差法分别测量了液态InSb的电阻率和热电势与温度的关系,得到了高精度的数据.发现液态InSb的电阻率温度系数在熔点附近随温度升高而增大;在高于617℃的高温区,该液体的电阻率与温度呈较好的线性关系.热电势温度系数在617℃左右也同样存在较明显的变化.结合其他物理性质随温度的变化规律及接近熔点温度的结构特点,可以认为液态InSb在熔点以上存在结构变化.关键词：电阻率热电势液态InSb结构转变

THE RELATIONSHIP BETWEEN ELECTRICAL RESISTIVITY, THERMOPOWER AND TEMPERATURE FOR LIQUID InSb

The electronic resistivity and thermopower of liquid InSb as a function of temperature have been measured using the d.c. four-probe method and also from the electromotive force produced by the temperature gradient. Abnormal behavior is observed and more accurate data are obtained. For liquid InSb, the temperature dependence of resistivity increases with temperature near the melting point, and almost is constant when the temperature is above 716℃. The abnormal behavior has also been found in the temperature dependence of thermopower almost at the same temperature. Based on other physical properties changing with temperature and the structure of liquid InSb near melting point, the result obtained in this work suggests that the liquid structure of InSb may be changed at 716℃.