The Ostwald concentration coefficients of acetonitrile in aqueous methanol, propan-1-ol, 2-methylpropan-2-ol (tert-butyl alcohol), 1,4-dioxane, and dimethyl sulfoxide have been measured by determining the
acetonitrile concentrations in the liquid and vapor phases by gas chromatography. The method described
is self-calibrating and allows the rapid determination of gas solubilities. It is found that the acetonitrile
solubility varies nonlinearly, and nonmonotonically, in the mixed solvents, passing through maxima in
the aqueous alcohol and 1,4-dioxane systems and showing a shallow minimum in the aqueous dimethyl
sulfoxide mixtures.
Thin films of lanthanum manganates doped with Ca2+, Sr2+, Ba2+ and Pb2+ have been deposited on Si(100) substrate and their electrical and magnetic properties were discussed with respect to the composition, structure and nature of the dopant. Buffer layers of YSZ and La0.8Al0.2O3 were employed and their effect on the materials was studied. Interesting magnetotransport properties were found in some of the films, where there is a large difference between the insulator-metal transition temperature and a ferromagnetic transition temperature.
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