Chemical Engineering Division physical inorganic chemistry annual report, July 1974--June 1975

Thermal conductivity measurements of methanol vapor were made in a hot-wire cell at temperatures ranging from 306 to 3450K and pressures from 80 to 760 torr. Emf measurements of the activities of Li in Li-Mg alloys indicate small negative deviations from ideal behavior. Conformal ionic solution theory has been extended to fourth order for additive ternary molten salt systems (AX-BX-CX). A miscibility isotherm at 5400C for the Na,Ag parallel NO3,Br system measured by a visual titration method appears to be consistent with theoretical considerations. Certain phase relationships in the systems, Li-Fe-S, Li-Cu-Fe-S, and Li-Co-Fe-S at 4000C, which are of interest to the lithium/metal sulfide battery program, were investigated. Emf measurements of Li-Al alloys relative to lithium were made. A value for the free energy of formation of Li2C2 was obtained from emf measurements. A study of the crystallization of metastable supercooled molten MgO-SiO2 droplets was made as a function of composition and temperatures. An examination of the diffusion of oxygen isotopes in mineral grains indicates that the oxygen isotope anomalies found by Clayton et al., in inclusions in the Allende meteorite appear to have been formed by diffusion of 17O and 18O into materials very low in these isotopes