Localization of topochemical reactions on the surface and in the bulk of crystals

Explosive thermal dehydration of solids

“…The division of the reactions of solids into surface localized and those localized in the bulk of crystals has been also used by Prodan in his recent studies [3,4]. As a criterion for this distinction he assumed the mode of the distribution of the reaction centres or of the nuclei of a new phase visible in an optical or an electron microscope.…”

“…An intersting phenomenon connected with the process of internal decomposition is the formation of bubbles in the bulk crystal, filled with liquid and gaseous reaction products, which occurs in the course of decomposition of hydrated acid phosphates [3]. An example is the reaction: 5MnHPO4"3H20 ~ Mns(HPO4)2 (PO4)2 "4H20 + H3PO4 + llH20…”

Reactions in solid state: Localized and delocalized

“…Attempts to systematize these and other described [11][12][13] types of intrinsic reactions in solids and to clarify their place in the classification systems of reactions show that the division of chemical transformations of solids into homogeneous (delocalized) and non-homogeneous (localized) is conventional and have to be defined more exactly [5,14,15].…”