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Martensitic Transformation in Ge 2 Sb 2 Te 5 Alloy
Author(s) -
Zhang W.,
Jeong H. S.,
Song S. A.
Publication year - 2008
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.200700230
Subject(s) - materials science , diffusionless transformation , hexagonal crystal system , density functional theory , alloy , crystallography , diffraction , condensed matter physics , ab initio , shearing (physics) , germanium , phase transition , martensite , computational chemistry , metallurgy , microstructure , quantum mechanics , physics , chemistry , silicon , composite material
Phenomenological crystallographic theory of martensitic transformation was applied to the phase transition of PRAM (phase‐change random access memory) Ge 2 Sb 2 Te 5 alloy for the first time. The speedy structural transition of Ge 2 Sb 2 Te 5 from cubic to hexagonal phases could be well described by a shearing transformation from cubic {002} to hexagonal {‐113} besides the removal of vacancies. This model shows good consistency with crystallographic models, X‐ray diffraction analysis, ab initio total energy and density‐functional theory calculations of Ge 2 Sb 2 Te 5 .
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