摘要
本文以直流四电极法、微差法以及差示扫描量热法(DSC)分别测量了Sn94Ag3Te3合金熔体的电导率σ、热电势S和热差ΔW随温度的变化行为。结果表明:在连续两轮的升降温过程中,合金熔体的电导率、热电势均在远高于液相线几百度的温区内发生了转变,且转变温度区间一致,而升温DSC曲线在高温区内,也出现了两个对应的吸热峰。由于电导率、热电势和热差都是结构敏感的物理量,这些参数的转变充分表明Sn94Ag3Te3合金熔体在升降温过程中的某个特定温度区间内发生了温度诱导的液态结构转变。对于这种异常变化,笔者认为是熔体内部化学短程序的打破和重组所造成的。
In this paper,the electronic conductivity σ,thermoelectric power S and thermal difference ΔW of the liquid Sn94Ag3Te3 alloy as the function of temperature were simultaneously investigated.Some abnormal phenomena were observed on both σ-T and S-T curves within certain temperature range.And through differential thermal analysis,it is found that two thermal peaks exist on DSC curve in the same sample.These all indicate that the structure transition has occurred in liquid Sn94Ag3Te3 alloy.For this abnormal phenomenon,it was assumed that some chemical short-range orders breaking and rebuilding are caused in the melt.
出处
《金属功能材料》
CAS
2011年第4期18-22,共5页
Metallic Functional Materials
