Temperature Dependence of Ferroelasticity of La_<0.6>Sr_<0.4>Co_<0.2>Fe_<0.8>O_<3-δ>
Details
For attractive mixed ion-electronic conduction properties and also magnetic properties, lanthanum cobalt oxides are expected to be applied in various fields, such as cathode of solid oxide fuel cells, oxygen separation membrane, and magnetic material. With regard to mechanical properties, anomalous behavior around room temperature, known as fentelasticity, has been reported in recent years. In the present study, we conducted uniaxial compression tests of La_<0.6>Sr_<0.4>Co_<0.8>Fe_<0.2>O_<3-δ> (LSCF) in the temperature range from 83 K to 543 K. The results demonstrated that LCO and LSCF exhibit ferroelastic behavior all the temperatures. The variation of the stress-strain curve with temperature was greater for LSCF than for LCO. The elastic modulus of LSCF slightly increases from 83 K to 273 K but drastically decreased around 273 K, which was higher than the one of LCO in the whole temperature range.
