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- W85512968 abstract "In order to identify the effects of minor titania additions and La:Sr cation ratio on the properties of lanthanum-strontium ferrites with high ionic conductivity, selected compositions in the La1−xSrxFe1−yTiyO3−δ system (x=0.5 and 0.7; y=0–0.25) have been appraised employing dilatometry, oxygen permeation studies and total conductivity with Seebeck coefficient measurements in the oxygen partial pressure (p(O2)) range, 10−20 to 0.5 atm. The total conductivity is predominantly p-type electronic in the p(O2) range 10−8–0.5 atm, with a relatively low, temperature-activated hole mobility indicating a hopping mechanism. Oxygen-ionic and n-type electronic transport is dominant for oxygen partial pressures below 10−14–10−10 atm. Titanium addition lowers electronic and oxygen ionic conductivity in both regimes, but also substantially decreases thermal expansion coefficients (TECs). The average TEC values are (12.4–13.6)×10−6K−1 at 300–900 K and (21.6–24.9)×10−6K−1 at 900–1300 K in air. In oxidizing atmospheres the steady-state oxygen permeation fluxes through La1−xSrxFeO3−δ (x=0.5–0.7) are similar, whereas under reducing conditions, La0.5Sr0.5FeO3−δ exhibits the highest ionic conductivity, rendering this composition a most promising parent compound for mixed-conducting membranes operating under large p(O2) gradients. The activation energies for ionic transport at low p(O2), 68–75 kJ/mol, are essentially independent of dopant concentration." @default.
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- W85512968 date "2005-04-01" @default.
- W85512968 modified "2023-10-13" @default.
- W85512968 title "Transport properties and thermal expansion of Ti-substituted La1−xSrxFeO3−δ ()" @default.
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- W85512968 doi "https://doi.org/10.1016/j.solidstatesciences.2005.01.001" @default.
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