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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/937

Title: Preparation of La0.5Sr0.5CoO3 powders and thin film from a new aqueous solution gel precursor
Authors: PAGNAER, John
HARDY, An
MONDELAERS, Dirk
VANHOYLAND, Geert
D'HAEN, Jan
VAN BAEL, Marlies
VAN DEN RUL, Heidi
MULLENS, Jules
Issue Date: 2005
Publisher: ELSEVIER SCIENCE SA
Citation: Materials Science and Engineering B, 118(1-3). p. 79-83
Abstract: This paper reports on the spin deposition of LSCO thin films on a SiO2/Si substrate by a new aqueous solution-gel route. Stable and monometallic precursor solutions are prepared from common and inexpensive oxides or hydroxides. The aqueous La3+ precursor is synthesized by reaction of La2O3 with citric acid. In order to prepare an aqueous Sr2+ precursor Sr(OH)(2) is complexed by EDTA. The new peroxo citrato CO2+ precursor is synthesized by reaction of Co(OH)(2) with hydrogen peroxide in an aqueous solution of citric acid. Mixing the individual precursors in stoichiometric quantities results in a clear and stable aqueous LSCO precursor solution. Evaporation of water transforms this solution in an amorphous gel that is homogeneous down to nanometer scale. In situ high temperature X-ray diffraction analysis of the gel reveals that phase pure LSCO powder is formed at 550 degrees C without detection of any intermediate crystalline phase. Spin deposition and crystallization at 625 degrees C in pure O-2 of this aqueous precursor solution resulted in a phase pure conductive LSCO thin film. The sheet resistance of this thin film amounted to 235 ohm/sq. Since the thickness of the film is 120 nm, the specific resistivity was calculated to be 2.8 m ohm cm at room temperature.
URI: http://hdl.handle.net/1942/937
DOI: 10.1016/j.mseb.2004.12.017
ISI #: 000228514800018
ISSN: 0921-5107
Category: A1
Type: Journal Contribution
Validation: ecoom, 2006
Appears in Collections: Research publications

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