Strain induced incommensurate structures in vicinity of reconstructive phase transitions. (1st September 2015)

• Record Type: Journal Article
• Authors: Korzhenevskii, A L; Dmitriev, V
• Is Part Of: Journal of physics. Volume 27:Number 37(2015)
• Publication Date: 2015-09-01
• Subjects: reconstructive phase transitions -- incommensurate phases -- Lifschitz invariant -- martensitic transformations; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/0953-8984/27/37/375401
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: General conditions controlling the formation of incommensurate phases in crystals undergoing reconstructive phase transitions are analyzed in the framework of a model-free phenomenological approach. A universal trend to stabilizing such intermediate phases in the vicinity of reconstructive phase transitions stems from the fact that certain high-order improper Lifshitz invariants reduce at such transformations to ones bi-linearly coupling critical displacement gradients and strains or even to the proper Lifshitz invariant. The approach developed here introduces a universal mechanism for the formation both of premartensite incommensurate phases and complex structures with giant unit cells, as found in some elemental crystals at high pressure.