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Title: Ferroelasticity and spin-state transitions of LaCoO{sub 3}

A uniaxial compression test of polycrystalline lanthanum cobaltite (LCO) was performed to investigate mechanical behavior of LCO in the temperature range of 83–553 K. Prepared by solid-state reaction, the electrical resistivity and the linear expansion coefficient of polycrystalline LCO, measured between 80 and 1273 K, exhibit distinct changes attributed to spin-state transitions of cobalt ions around 100–200 K and 400–600 K, but are relatively constant between 200 and 400 K. The stress-strain curve obtained under uniaxial compression shows strong nonlinearity due to ferroelastic domain switching process between 83 and 553 K. Initial Young's moduli, critical stress, and dissipated energy evaluated from the stress-strain curves decrease by about a half with increasing the temperature, whereas there was no drastic changes even around the spin-state transition temperatures. The initial modulus agrees with the temperature dependence of the apparent Young's modulus measured under low-stress cyclic loading.
Authors:
; ;  [1]
  1. Department of Mechanical Engineering, Saitama University, 255 Shimo-Okubo, Sarkura-ku, Saitama 3388570 (Japan)
Publication Date:
OSTI Identifier:
22308520
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; 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; COBALT COMPOUNDS; COBALT IONS; COMPRESSION; CUPRATES; ELECTRIC CONDUCTIVITY; EXPANSION; HIGH SPIN STATES; LANTHANUM COMPOUNDS; NONLINEAR PROBLEMS; OXYGEN COMPOUNDS; POLYCRYSTALS; SOLIDS; SPIN; STRAINS; STRESSES; TEMPERATURE DEPENDENCE; TRANSITION TEMPERATURE