Influence of Chemical Composition on Crystal Structure of Multicomponent Carbides, Carbohydrides and Carbonitrides of Transition Metals

Abstract

The paper presents a summary of the experimental works made in the Nalbandyan Institute of Chemical Physics of Armenian NAS during the period of 2008-2018. Here the results of studies on the synthesis of multicomponent compounds containing transition metals of IV and V groups, chromium, molybdenum, cobalt and carbon at combustion in the atmosphere of argon, hydrogen, nitrogen and nitrogen/hydrogen mixture are described. Using SHS, single-phase carbides, carbohydrides, carbonitrides and carbohydridonitrides, based on titanium, vanadium, zirconium, niobium and chromium were synthesized in one technological step. It was shown that over the entire range of changes in the metal/carbon ratio at low concentrations of carbon, carbohydrides and carbonitrides with a cubic FCC lattice formed. The influence of the metal/nonmetal ratio on the phase composition of the final products was studied, and the X-ray densities of the obtained compounds were calculated. It is shown that the increasing of the carbon and vanadium content, as well as the doping carbides, carbonitrides and carbohydrides with molybdenum and cobalt lead to the increasing of X-ray density.