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
Source: 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.
Keywords: Metal Oxide nanomaterials;Physical Analysis and Characterisation
Document URI: http://hdl.handle.net/1942/937
ISSN: 0921-5107
e-ISSN: 1873-4944
DOI: 10.1016/j.mseb.2004.12.017
ISI #: 000228514800018
Category: A1
Type: Journal Contribution
Validations: ecoom 2006
Appears in Collections:Research publications

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