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Title: In-situ neutron diffraction of LaCoO{sub 3} perovskite under uniaxial compression. II. Elastic properties

Calculations of elastic constants and development of elastic anisotropy under uniaxial compression in originally isotropic polycrystalline LaCoO{sub 3} perovskite are reported. The lattice strains in individual (hkl) planes as well as average lattice strain were determined both for planes oriented perpendicular and parallel to the loading direction using in-situ neutron diffraction. Utilizing average lattice strains as well as lattice strains along the a and c crystallographic directions, an attempt was made to determine Poisson's ratio of LaCoO{sub 3}, which was then compared with that measured using an impulse excitation technique. The elastic constants were calculated and Young's moduli of LaCoO{sub 3} single crystal in different crystallographic directions were estimated.
Authors:
 [1] ;  [2] ; ;  [1] ;  [1] ;  [3] ; ;  [4] ;  [5] ; ; ;  [6]
  1. Department of Mechanical and Aerospace Engineering, University of Central Florida, Orlando, Florida 32816 (United States)
  2. (Ukraine)
  3. (United States)
  4. Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for High Performance Ceramics, Ueberlandstrasse 129, 8600 Duebendorf (Switzerland)
  5. The School of Engineering and Materials Science, Queen Mary, University of London, London E1 4NS (United Kingdom)
  6. Chemical and Engineering Materials Division, Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
Publication Date:
OSTI Identifier:
22306158
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)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANISOTROPY; COBALT COMPOUNDS; COMPRESSION; CRYSTALLOGRAPHY; ELASTICITY; EXCITATION; LANTHANUM COMPOUNDS; MONOCRYSTALS; NEUTRON DIFFRACTION; OXYGEN COMPOUNDS; PEROVSKITE; POLYCRYSTALS; PULSES; STRAINS; YOUNG MODULUS