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

Journal Article · Mon Jul 28 00:00:00 EDT 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4891296· OSTI ID:22308520

Araki, Wakako; Abe, Takehiro; Arai, Yoshio ^[1]

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1. Department of Mechanical Engineering, Saitama University, 255 Shimo-Okubo, Sarkura-ku, Saitama 3388570 (Japan)

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.

• OSTI ID: 22308520
• Journal Information: Journal of Applied Physics, Vol. 116, Issue 4; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

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