Alkoxide Route to La0.5Sr0.5CoO3 Films and Powders |
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Authors: | Annika Pohl Gunnar Westin |
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Affiliation: | Department of Materials Chemistry, Ångström Laboratory, Uppsala University, Uppsala, Sweden |
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Abstract: | An all-alkoxide route to films and nano-phase powders of the La0.5Sr0.5CoO3 perovskite is described. To our knowledge, this is the first purely alkoxide-based route to (La1? x Sr x )CoO3, and it yields phase-pure and elementally homogeneous perovskite at 700°C by heating at 2°C/min. At 700°C, a cubic unit cell was obtained with a c=3.853Å, and after further heating to 1000°C, a rhombohedral cell could be indexed: a r=5.417 Å, αr=59.94°. Ninety to 130 nm thick films of La0.5Sr0.5CoO3 were obtained by spin coating. The gel-to-oxide conversion was studied in some detail, using thermo-gravimetric analysis, differential scanning calorimetry, powder X-ray diffraction, IR spectroscopy, and transmission electron microscope equipped with an energy-dispersive X-ray spectrometer. |
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