Thermodynamic Study of Electronic Materials

1)高纯金属中的氧分析：采用新型氧传感器和泵的氧分析方法，测定了高纯金属中Ge、Bi和Sb的氧含量。尽管样品中的氧浓度相当低，但分析值高度一致和可靠。2)液态二元合金中氧的热力学性质：采用改进库仑滴定法测定了Ni-S和Co-S熔体中氧的活度系数。两种熔体中氧的活度系数随硫化物组成的增加而迅速增加。3)包括In或Ga在内的液态二元和三元合金的热力学研究：采用稳定的氧化锆固体电解质，采用电动势法测定了Ga- sb -In、Ga- sb - bi、In- bi - ti和In- pb - sb三元合金中铟或镓的活性。根据各组分二元合金的数据，采用Gibbs-Duhern方程和改进的三元合金计算方法计算了其他的力学性能。4)化合物半导体材料的热力学研究：镓在GaAs-InAs固溶体与贫砷液相共存的整个组成范围内的活性。基于模型计算的相关系可以定性地解释活度的组分依赖性。5) -氧化铝离子交换反应与Ag或Ga二元合金中Ag或Go活性的测定：在AgNO_3或Ga- GaCl_2熔体中，通过na - -氧化铝的吨交换反应制备了Ag^+或Ga^+- -氧化铝固体电解质。测定了后续电池的电动势，测定了液态Ga- sb合金中Ga的活性。用Ag^+- β -氧化铝固体电解质对Ag- pb合金进行了同样的实验，但由于固体电解质在电磁场测量中被破坏，无法获得可靠的数据。

1) Analysis of oxygen in high purity metals: By using new type oxygen analytical method employing oxygen sensor and pump, the oxygen contents in high purity Ge,Bi and Sb have been determined. The analytical values were highly consistent and reliable despite the fairly low oxygen concentration in the sample.2) Thermodynamical properties of oxygen in liquid binaly alloys: Activity coefficients of oxygen in Ni-S and Co-S melts were determined by using a modified coulometic titration technique. The activity coefficients of oxygen in both melts are rapidly increased with increasing the sulfir compositions.3) Thermodynamic study of liquid binary and temary alloys including In or Ga: By the EMF method using stabilized zirconia solid electrolyte, indium or gallium activities in Ga-Sb-In,Ga-Sb-Bi,In-Bi-TI and In-Pb-Sb temary alloys were determined. The other thennodynamic properties were calculated based on Gibbs-Duhern equation and modified calculation method for temary alloys from the data of each constituent binary alloys.4) Thermodynamic study of compound semiconducten materials: The activities of gallium in the whole composition range of GaAs-InAs solid solutions coexisting with arsenic poor temary liquid phases. Composition dependence of the activity can be explained qualitatively in terms of the phase relation based on the model calculation.5) Ion exchange reaction of beta-alumina and Ag or Go activity measurement in liquid Ag or Ga binary alloys: Ag^+ or Ga^+-beta-alumina solid electrolyte was prepared-by ton-exchange reaction of Na-beta-alumina in AgNO_3 or Ga- GaCl_2 melts. The EMF of following cell was measured and the activities of Ga in liquid Ga-Sb alloys were determined. The same experiments for Ag-Pb alloy by using Ag^+-beta-alumina solid electrolyte was tried, however the reliable data could not obtained because solid electrolyte was broken during EMF measurements.