Solid solutions of the InAs-A^IIB^VI heterosystems. Bulk, surface physical and chemical properties

Using specifically developed methods, solid solutions of the InAs-A^IIB^VI (A^IIB-ZnS, CdTe) systems have been obtained. In accordance with the results of X-ray studies in combination with the results of micro, submicroscopical studies, they were certified as solid substitution solutions with a cubic sphalerite structure; information on crystal-chemical and structural properties has been obtained; the elemental compositions have been determined, which substantially coincide with the given molar ones. The acid-base properties of the solid solutions surfaces and binary components of the systems revealing a weak-acid character and increased activity towards main gases have been studied. The consistent patterns of changes in bulk and surface properties with a change in composition have been established which obey mainly to a statistical law as applied to the InAs-CdTe system and with extreme manifestations as applied to the InAs-ZnS system, which have been substantiated. The connections between the consistent patterns, the influence of bulk properties (in particular, the forbidden bandwidth, the electronegativity difference) on the surface properties have been revealed. The objectives for the search of the advanced materials for the sensor technology, based on more accessible information on bulk properties, have been set. The practical guidelines have been given on the use of the obtained materials for the manufacture of measuring cells for the main gases trace contamination. (paper)