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Alkoxide Route to La 0.5 Sr 0.5 CoO 3 Films and Powders
Author(s) -
Pohl Annika,
Westin Gunnar
Publication year - 2005
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2005.00424.x
Subject(s) - alkoxide , perovskite (structure) , differential scanning calorimetry , materials science , transmission electron microscopy , analytical chemistry (journal) , phase (matter) , sol gel , magnetization , scanning electron microscope , crystallography , mineralogy , chemistry , nanotechnology , catalysis , physics , organic chemistry , quantum mechanics , magnetic field , composite material , thermodynamics , biochemistry , chromatography
An all‐alkoxide route to films and nano‐phase powders of the La 0.5 Sr 0.5 CoO 3 perovskite is described. To our knowledge, this is the first purely alkoxide‐based route to (La 1− x Sr x )CoO 3 , 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, α r =59.94°. Ninety to 130 nm thick films of La 0.5 Sr 0.5 CoO 3 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.