Solid-state thermal processes have their own specificity, distinguishing them from the processes in gases and liquids. This specificity includes, among others, their limited reversibility and the limited or modified role of chemical affinity as the main driving force indicating the direction of real solid-state processes. The consequency is the formation of metastable compounds or phases during heating, as intermediate steps towards the state of thermodynamic equilibrium. They are a results of the particular properties of the rigid internal structure of minerals and materials as the thermal reaction medium. The peculiarities of thermal reactions of solids are presented on the example of those of oxides (silicates and borates) with polymeric structures. The significance of crystal-chemical factors for the prediction or explanation of the course of high-temperature processes, as complementing the thermodynamic factors, is discussed.

Nature and philosophy of thermal processes in minerals and inorganic materials

The synergy has always led to the renaissance of production of many new substances but the same also has led to the decrease in the efficiency of many of the processes that has led to cause considerable changes. The chemistry of the fuel is one of those fields, which has seen greater effect for effecting the restructuring and redistribution of the fuel. Collaboration of solid state research with nuclear fuels has led to the improved technologies to be fostered inorder to reach the 100% efficacy. High temperatures and thermal gradients existing in the fuel acts as a driving force for many processes, resulting in interaction of the fuel with the substances like clad in nuclear reactor. So an attempt was made to study the effect of Chromium carbide, the product of thermal carburisation of oxide that is formed as a protective layer of clad, on the thermal decomposition of oxohalate. Also a comparative study of effect of chromium, its oxide and its carbide are presented in this paper. 

K. Suba

Papers

Thermochemical investigation of solid state reactions in molybdates/tungstates system