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KMID : 1059519940380040276
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Journal of the Korean Chemical Society
1994 Volume.38 No. 4 p.276 ~ p.282
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Reactivity and Preparation of Perovskite-Type Mixed Oxides LaBO3(B = Mn, Fe, Co) by Citrate Sol-Gel Method
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Hwang Ho-Soon
Park Il-Hyun
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Abstract
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Perovskite-type mixed oxides LaBO3(B = Mn, Fe, Co) were prepared by citrate sol-gel method in air(850℃, 24h). The oxygen stoichiometries and structures of these oxides were determined by XRD and TPR results as followings; LaMnO3.16(a = 5.507, c = 13.329 Å, hexagonal), LaFeO3.17(a = 5.554, b = 5.555, c = 7.863 Å, orthorhomibic), LaCoO3.0(a = 5.436, c = 13.095 Å, hexagonal). The temperature programmed reduction(TPR) experiments in static 300 torr H2 atmosphere shows that the reduction reaction of LaBO3(B = Mn, Fe, Co) proceeds into two stages, and thermal stabilities of these oxides decreased in the order of LaMnO3 > LaFeO3 > LaCoO3. According to the kinetic analysis the lowest activation energy was obtained for LaCoO3.
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