Crystalline-State Reaction and Reaction Cavity

Abstract

There are two types of solid-state reactions keeping the single crystal form: single crystal-to-single crystal (SCSC) transformations and crystalline-state reactions. In the former reactions, the crystal structures before and after the reaction are very similar to each other, but the crystallinity is not kept during the reaction. In the latter reactions, the crystallinity is kept in a whole process of the reaction. The reaction cavity was defined to estimate the void space around the reactive group. For the crystalline-state reaction, it was easy to understand the way how the void space is effectively utilized in the process of the reaction, comparing the void space before and after the reaction.