Titel
Symmetry-Adapted Finite Strain Landau Theory Applied to KMnF3
Sohaib Ehsan
Institute of Materials Chemistry, Vienna University of Technology
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Abstract
In recent years, finite strain Landau theory has been gradually developed as both a conceptual as well as a quantitative framework to study high pressure phase transitions of the group-subgroup type. In the current paper, we introduce a new version of this approach which is based on symmetry-adapted finite strains. This results in a substantial simplification of the original formulation. Moreover, it allows for replacing the clumsy use of truncated Taylor expansions by a convenient functional parametrization. Both the weaknesses of the traditional Landau approach based on infinitesimal strains as well as the major improvements made possible by our new parametrization are illustrated in great detail in an application to the ambient temperature high pressure transition of the perovskite KMnF3.
Stichwort
high pressurephase transitionsLandau theorynonlinear elasticity theoryperovskites
Objekt-Typ
Sprache
Englisch [eng]
Persistent identifier
Erschienen in
Titel
Crystals
Band
10
Ausgabe
2
ISSN
2073-4352
Erscheinungsdatum
2020
Seitenanfang
124
Publication
MDPI AG
Erscheinungsdatum
2020
Zugänglichkeit
Rechte
Rechteangabe
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