Structural Phase Transition Nomenclature. Report of an IUCr Working Group on Phase Transition Nomenclature

A compact and intuitive nomenclature is recommended for naming each phase formed by a given material in a sequence of phase transitions as a function of temperature and/or pressure. The most commonly used label for each phase in a sequence, such as α, β, ..., I, II, ... etc., is included in the new nomenclature.