Electrophysical Properties of Melted Carbide ТіС, ZrC, NbC in the Range of its Homogeneity

Abstract

Structure and same electrical properties of carbides of titanium, zirconium and niobium were tested in region of homogeneity. Samples of these carbides processed in the arc furnace using consumable electrodes. These samples were mono-phase, had not porosity and had minimum content of impurities of oxygen and carbon. It was found, that properties such as electrical resistivity, thermal resistance coefficient, Hall’s coefficient, concentration and mobility of charge carriers of these carbide phases vary depending on the content impurities of carbon in region of homogeneity and place of metals to create of carbides in periodic table. The nature of carbides analyses from positions of model of solid state. The base of this model is configuration of localization of valence electrons of atoms. Changing the properties of carbide phases depends on the ratio between the forces of bonds Me–C and Me–Me, which depends on the degree of stabilization sp 3 -configuration. And the degree of stabilization is depending from donor’s ability of metal which create carbide and from ratio between atoms of metal and carbon. It was established, that absolute values of properties that have been investigated similar to the values of the properties of single-crystal samples. This indicates a more ordered crystalline lattice fused refractory compounds, as well as less impurity content and absence porosity.