Structural Characterization of Electrochemically Oxidized La2CuO4+δParticles Prepared by a Sol–Gel Method

The structure of powder samples of electrochemically oxidized La2CuO4+δwas studied using X-ray powder diffraction. The base La2CuO4material was prepared by a sol–gel method that allowed control of the mean particle size by calcining at different temperatures. The results show that the structure of t...

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Bibliographic Details
Published in:Journal of solid state chemistry 1997-07, Vol.131 (2), p.246-251
Main Authors: Mahı́a, José, Martı́nez-Lorenzo, José Luis, Blanco, M.Carmen, López-Quintela, M.Arturo
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Inorganic compounds
Physics
Salts
Structure of solids and liquids
crystallography
Structure of specific crystalline solids
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Summary:The structure of powder samples of electrochemically oxidized La2CuO4+δwas studied using X-ray powder diffraction. The base La2CuO4material was prepared by a sol–gel method that allowed control of the mean particle size by calcining at different temperatures. The results show that the structure of the electrochemically oxidized samples is very sensitive to the synthesis method, particularly the calcination temperature,Tcal. The refined lattice parametersbandc, the unit cell volumeV, and the orthorhombicity of the oxidized samples are found to increase considerably whenTcaldecreases. These variations indicate an increase in the quantity of interstitial oxygen in the samples calcined at lower temperatures with respect to the interstitial oxygen presents in ceramic samples. Particle size distributions were determined by transmission electron microscopy. A decrease in the mean particle size whenTcaldecreases was observed.
ISSN:0022-4596
1095-726X
DOI:10.1006/jssc.1997.7368