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Strain‐induced phase transitions in epitaxial NaNbO 3 thin films grown by metal–organic chemical vapour deposition
Author(s) -
Schwarzkopf Jutta,
Schmidbauer Martin,
Remmele Thilo,
Duk Andreas,
Kwasniewski Albert,
Bin Anooz Saud,
Devi Anjana,
Fornari Roberto
Publication year - 2012
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889812035911
Subject(s) - orthorhombic crystal system , monoclinic crystal system , epitaxy , materials science , chemical vapor deposition , crystallography , phase (matter) , thin film , phase transition , strain (injury) , condensed matter physics , chemistry , crystal structure , nanotechnology , organic chemistry , medicine , physics , layer (electronics)
Epitaxially strained NaNbO 3 films were grown by liquid‐delivery spin metal–organic chemical vapour deposition on several oxide substrates, inducing tensile and compressive lattice strain. High‐resolution X‐ray diffraction measurements reveal that coherently grown compressively strained NaNbO 3 films on NdGaO 3 exhibit the orthorhombic c phase. With increasing in‐plane strain a first structural phase transition to the monoclinic r phase and, further on, for films grown under tensile strain on rare earth scandates, a second phase transition to the aa phase, are observed. Our results are in good agreement with the pathway of phase transitions predicted by Diéguez, Rabe & Vanderbilt [ Phys. Rev. B , (2005), 72 , 144101] for NaNbO 3 films.