peritectoid reaction

Synonym: metatectoid reaction
https://doi.org/10.1351/goldbook.P04501
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.
Source:
PAC, 1994, 66, 577. (Definitions of terms relating to phase transitions of the solid state (IUPAC Recommendations 1994)) on page 588 [Terms] [Paper]