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- W1978573808 abstract "Abstract The electric conductivity and Seebeck coefficient of sodium and strontium doped LaMnO3 were measured as a function of temperature and partial pressure of oxygen. The electrical conductivity measurements of La1−xNaxMnO3 (x=0.1–0.4) suggest a semiconductor behaviour from room temperature to 800–900°C. Both the electric conductivity and XRD results indicate a decomposition of the perovskites at sufficiently reduced atmosphere. Thus, La0.8Na0.2MnO3 decomposes at PO2 ∼ 10−17 atm and PO2 ∼ 10−13 atm at 800°C and 1000°C, respectively, whereas La0.8Sr0.2MnO3 decomposes at PO2 ∼ 10−15 atm at 1000°C. At low partial pressures of oxygen the conductivity exhibits a P 1 4 O 2 dependency for both sodium- and strontium-doped LaMnO3. At high partial pressures of oxygen the conductivity is nearly independent of the variation of PO2. Positive Seebeck coefficients indicate p-type carriers in the perovskite oxides. The mobility of the carriers was calculated at 1000°C and 1 atm O2, assuming a small polaron model. For La1−xNaxMnO3 (x=0.1, 0.2) the CH4 conversion and C2-selectivity were measured in a quartz fixed-bed reactor as a function of temperature and partial pressure of oxygen. The results indicate a maximum selectivity to C2H4 at 820°C for both catalysts. It was observed that La0.8Na0.2MnO3 showed an increasing C2H4 selectivity and a decreasing CH4 conversion when the PCH4/PO2 ratio increased." @default.
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- W1978573808 date "1993-11-01" @default.
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- W1978573808 title "Electric and catalytic properties of doped LaMnO3" @default.
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- W1978573808 doi "https://doi.org/10.1016/0167-2738(93)90409-v" @default.
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