From La2O3 To LaCoO3: XPS Analysis

Natile, Marta Maria; Galenda, Alessandro; Glisenti, Antonella

doi:doi:10.1116/11.20061006

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Surface Science Spectra / Volume 15 / Issue 1

Surf. Sci. Spectra 15, 1 (2008); http://dx.doi.org/10.1116/11.20061006 (13 pages)

From La₂O₃ To LaCoO₃: XPS Analysis

Marta Maria Natile¹, Alessandro Galenda², and Antonella Glisenti²

¹ISTM-CNR, University of Padova, Dipartimento di Scienze Chimiche, Via F. Marzolo, 1, Padova, 35131, Italy
²University of Padova, Dipartimento di Scienze Chimiche, Via F. Marzolo, 1, Padova, 35131, Italy

(Published online 7 May 2010)

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Nanostructured LaCoO₃ powder was prepared by a new approach: cobalt oxide nanoparticles were deposited, by wet impregnation, on the La₂O₃ surface. The La₂O₃ support was prepared by precipitation from a basic solution of La(NO₃)₃⋅6H₂O. The precipitate was dried at 353 K for 2 h and calcined at 923 K for 6 h in air. Nanostructured LaCoO₃ was obtained by wet impregnation of La₂O₃ with aqueous solutions of Co(NO₃)₂⋅6H₂O: [Co/La]_nomimal = 1.0 (nominal atomic ratio is obtained from the precursors weighed quantities). The obtained suspension was maintained under stirring for two days and then kept in rest for one day. Water was evaporated in air and the obtained solid was dried at 353 K for 2 h and at 923 K for 6 h in air. The thermal treatment in air promotes a solid state reaction between La-O and Co-O and then the formation of LaCoO₃.

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KEYWORDS and PACS

Keywords

calcination, cobalt compounds, lanthanum compounds, nanoparticles, powders, precipitation, La2O3, LaCoO3, Perovskite, nanostructured powder, wet impregnation

PACS

61.46.Df

Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots)
81.10.Dn

Growth from solutions
81.10.Fq

Growth from melts; zone melting and refining
81.15.Lm

Liquid phase epitaxy; deposition from liquid phases (melts, solutions, and surface layers on liquids)
81.40.Gh

Other heat and thermomechanical treatments
81.20.Ev

Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation