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Title: In-situ neutron diffraction of LaCoO₃ perovskite under uniaxial compression. I. Crystal structure analysis and texture development

The dynamics of texture formation, changes in crystal structure, and stress accommodation mechanisms have been studied in perovskite-type R3⁻c rhombohedral LaCoO₃ during uniaxial compression using in-situ neutron diffraction. The in-situ neutron diffraction revealed the complex crystallographic changes causing the texture formation and significant straining along certain crystallographic directions during compression, which are responsible for the appearance of hysteresis and non-linear ferroelastic deformation in the LaCoO₃ perovskite. The irreversible strain after the first loading was connected with the appearance of non-recoverable changes in the intensity ratio of certain crystallographic peaks, causing non-reversible texture formation. However, in the second loading/unloading cycle, the hysteresis loop was closed and no further irrecoverable strain appeared after deformation. The significant texture formation is responsible for an increase in the Young's modulus of LaCoO₃ at high compressive stresses, ranging from 76 GPa at the very beginning of the loading to 194 GPa at 900 MPa at the beginning of the unloading curve.
Authors:
;  [1] ;  [1] ;  [2] ;  [1] ;  [3] ;  [4] ; ; ;  [5]
  1. Department of Mechanical and Aerospace Engineering, University of Central Florida, Orlando, Florida 32816 (United States)
  2. (United States)
  3. (Ukraine)
  4. The School of Engineering and Materials Science, Queen Mary, University of London, London E1 4NS (United Kingdom)
  5. Chemical and Engineering Materials Division, Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
Publication Date:
OSTI Identifier:
22306246
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 1; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COBALT COMPOUNDS; COMPRESSION; CRYSTALLOGRAPHY; DEFORMATION; HYSTERESIS; LANTHANUM COMPOUNDS; NEUTRON DIFFRACTION; NONLINEAR PROBLEMS; OXYGEN COMPOUNDS; PEROVSKITE; PRESSURE RANGE GIGA PA; STRAINS; STRESSES; TEXTURE; TRIGONAL LATTICES; YOUNG MODULUS