Thermodynamic Study of Electronic Materials

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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.