Synonym: metatectoid reaction
An isothermal, reversible reaction in the solid state, that, on cooling of a binary, ternary, ... , \(n\) system, results in one, two, ... (\(n-1\)) new solid phases. For example, in a binary system containing two solids \(\alpha'\) and \(\alpha''\) \[\alpha' + \alpha'' \rightarrow \beta\] Synonymous with metatectoid reaction.
PAC, 1994, 66, 577. (Definitions of terms relating to phase transitions of the solid state (IUPAC Recommendations 1994)) on page 588 [Terms] [Paper]