Thermal decomposition of ammonium perchlorate

Topochemistry and topochemical reactions

Topochemistry of thermal decompositions of solids

The paper deals with some of the assumtions and limitations of ‘classical’ models used in thermal analysis kinetic studies of solid-state rections.

The problem of feed-back in solid-state chemistry

A review of studies of reactivities of solids is presented, concentrating on localization and autolocalization phenomena. Some examples of feed-back and structure of the reaction zone are given.

Reactivity of solids

Variation of the reactivity of solids near the interface reagent-product of the topochemical reaction

During the decomposition of thin layers of copper hypophosphite on a plate, an increased concentration of the active product of the reaction (acid) may be observed near the reactantproduct interface, The acid profile near the interface widens on increase of the decomposition temperature. The profile can also be widened by reducing the efficiency of acid removal to the plate by its preliminary acid saturation. In both cases the rate of interface propagation is increased. The increased reactivity of copper hypophosphite near the interface, and the technological character of the decomposition reaction, are caused by acid diffusion from the reaction product into non-reacted parts of the substance.

T. O. Zaikova

Papers

Variation of the reactivity of solids near the interface reagent-product of the topochemical reaction

Investigation of the acid distribution near the reactant-product interface during the thermal decomposition of copper hypophosphite thin layers