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Title: Microstructure of highly strained BiFeO{sub 3} thin films: Transmission electron microscopy and electron-energy loss spectroscopy studies

Microstructure and electronic structure of highly strained bismuth ferrite (BiFeO{sub 3}) thin films grown on lanthanum aluminate substrates are studied using high-resolution transmission and scanning transmission electron microscopies and electron energy loss spectroscopy (EELS). Monoclinic and tetragonal phases were observed in films grown at different temperatures, and a mix of both phases was detected in a film grown at intermediate temperature. In this film, a smooth transition of the microstructure was found between the monoclinic and the tetragonal phases. A considerable increase in the c-axis parameters was observed in both phases compared with the rhombohedral bulk phase. The off-center displacement of iron (Fe) ions was increased in the monoclinic phase as compared with the tetragonal phase. EEL spectra show different electronic structures in the monoclinic and the tetragonal phases. These experimental observations are well consistent with the results of theoretical first-principle calculations performed.
Authors:
 [1] ;  [2] ; ; ;  [1] ;  [1] ;  [3]
  1. Max Planck Institute of Microstructure Physics, Weinberg 2, D-06120 Halle (Germany)
  2. (KRISS), Daejeon 305-340 (Korea, Republic of)
  3. (United Kingdom)
Publication Date:
OSTI Identifier:
22275597
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 4; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALUMINATES; BISMUTH COMPOUNDS; COMPARATIVE EVALUATIONS; ELECTRON SPECTRA; ELECTRONIC STRUCTURE; ENERGY-LOSS SPECTROSCOPY; FERRITES; IRON IONS; LANTHANUM COMPOUNDS; MICROSTRUCTURE; MONOCLINIC LATTICES; STRAINS; SUBSTRATES; TEMPERATURE DEPENDENCE; THIN FILMS; TRANSMISSION ELECTRON MICROSCOPY; TRIGONAL LATTICES