TRANSPORT PROPERTIES OF THE MIXED-CONDUCTING SRFE1.2CO0.3OX

摘要: Single phase SrFe1.2Co0.3Ox sample with layered crystal structure was prepared using a solid state reaction method. Electrical conductivity and apparent oxygen diffusion coefficients of the were measured as functions temperature in atmospheres various partial pressures \(({\text{P}}_{{\text{O}}_{\text{2}} } )\). Total ionic conductivities determined by conventional four-probe electron blocking methods, respectively. The coefficient derived from time-dependent relaxation data reequilibrium process after abruptly changing )\) surrounding atmosphere. Several different established use premixed gas cylinders. increases increasing At 900°C air, total are 10 8 S · cm-2, transference number (≈ 0.8 air) does not have strong dependence. activation energy decreasing In has low value ≈ 0.37 eV. \( \approx 2 \times 10^{ - 6} {\text{ cm}}^{\text{2}} \cdot {\text{s}}^{{\text{ 1}}}\) at 950°C over wide range \({\text{P}}_{{\text{O}}_{\text{2}}} (1 \leqslant {\text{P}}_{{\text{O}}_{\text{2}}} 18} {\text{atm}})\) .