中文摘要：

采用直流四电极法研究了常压下Sn-Zn合金系的电阻率随温度连续升温的变化规律。结果表明：合金Sn-Zn5、Sn-Zn8．8、Sn-Zn20、Sn-Zn30、Sn-Zn40、Sn-Zn50和Sn-Zn70分别在970、1008、957、950、948、926和873℃处发生了电阻率的突变现象。对合金的进一步分析表明，Sn-Zn熔体电阻率在高温时的突变是由Zn在Sn-Zn熔体中大量汽化造成的，即在此处发生了液-气结构转变；Sn-Zn合金在完全熔化至发生液-气结构转变的连续升温过程中，合金中并不存在某种液-液结构的转变，且液-液结构转变并非存在于在所有二元合金系中。

英文摘要：

The change rule of electrical resistivity with the increase of temperatures of tin-zinc （Sn-Zn） alloys with different compositions were investigated using the direct current four-probe technique at constant pressure. The results show that some transitions occur at the temperatures of 970, 1 008, 957, 950, 948, 926 and 873 ℃. According to the analysis of the resistivity-temperature （p-t） curves, the obtained significant abnormal variation of the electrical resistivity at high temperature of Sn-Zn alloys is considered to be caused by the abundant gasification of Zn component in Sn-Zn alloys, namely the liquid-gas structure transition takes place in melts, And no temperature-induced llquid-liquid structure transition exists in Sn-Zn melts.