skip to main content

Title: Untilting BiFeO{sub 3}: The influence of substrate boundary conditions in ultra-thin BiFeO{sub 3} on SrTiO{sub 3}

We report on the role of oxygen octahedral tilting in the monoclinic-to-tetragonal phase transition in ultra-thin BiFeO{sub 3} films grown on (001) SrTiO{sub 3} substrates. Reciprocal space maps clearly show the disappearance of the integer-order Bragg peak splitting associated with the monoclinic phase when the film thickness decreases below 20 unit cells. This monoclinic-to-tetragonal transition is accompanied by the evolution of the half-order diffraction peaks, which reflects untilting of the oxygen octahedra around the [110] axis, proving that the octahedral tilting is closely correlated with the transition. This structural change is thickness-dependent, and different from a strain-induced transition in the conventional sense.
Authors:
;  [1] ;  [2] ;  [3] ;  [4] ;  [3] ;  [4]
  1. Department of Physics, University of Michigan, Ann Arbor, Michigan 48109 (United States)
  2. X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
  3. Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853 (United States)
  4. (United States)
Publication Date:
OSTI Identifier:
22269588
Resource Type:
Journal Article
Resource Relation:
Journal Name: APL Materials; Journal Volume: 1; Journal Issue: 5; Other Information: (c) 2013 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BOUNDARY CONDITIONS; BRAGG CURVE; DIFFRACTION; FILMS; MONOCLINIC LATTICES; OXYGEN; PHASE TRANSFORMATIONS; STRONTIUM TITANATES; SUBSTRATES; THICKNESS