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Pure and Ca-doped LaCoO3 Nanopowders: Sol-Gel Synthesis, Characterization and Magnetic Properties

Published online by Cambridge University Press:  01 February 2011

Lidia Armelao ,
Davide Barreca ,
Gregorio Bottaro ,
Andrea Caneschi ,
Claudio Sangregorio ,
Alberto Gasparotto ,
Stefano Gialanella ,
Cinzia Maragno  and
Eugenio Tondello
Lidia Armelao
Affiliation:
ISTM-CNR and INSTM - Department of Chemistry - University of Padova -, Italy
Davide Barreca
Affiliation:
ISTM-CNR and INSTM - Department of Chemistry - University of Padova -, Italy
Gregorio Bottaro
Affiliation:
ISTM-CNR and INSTM - Department of Chemistry - University of Padova -, Italy
Andrea Caneschi
Affiliation:
Department of Chemistry and INSTM - University of Firenze -, Italy
Claudio Sangregorio
Affiliation:
Department of Chemistry and INSTM - University of Firenze -, Italy
Alberto Gasparotto
Affiliation:
Department of Chemistry and INSTM - University of Padova -, Italy
Stefano Gialanella
Affiliation:
Department of Engineering and Industrial Technologies - University of Trento -, Italy
Cinzia Maragno
Affiliation:
Department of Chemistry and INSTM - University of Padova -, Italy
Eugenio Tondello
Affiliation:
Department of Chemistry and INSTM - University of Padova -, Italy
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Abstract

This work is focused on the sol-gel synthesis of pure and Ca-doped LaCoO3 nanopowders. The samples were prepared starting from methanolic solutions of cobalt (II) acetate (Co(CH3COO)2·4H2O), lanthanum (III) nitrate (La(NO3)3·6H2O) and calcium (II) acetate (Ca(CH3COO)2·H2O). After solvent evaporation, the obtained powders were dried under vacuum and subsequently treated in air up to 1273 K. The system evolution under thermal annealing was studied by X-ray Diffraction (XRD) and Transmission Electron Microscopy (TEM), while the chemical composition was analyzed by X-ray Photoelectron (XPS) and X-ray Excited Auger electron (XE-AES) spectroscopies. The temperature and field dependence of the magnetic properties of the Ca-doped samples were investigated, and compared to those of the corresponding pure LaCoO3 powders.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 848: Symposium FF – Solid-State Chemistry of Inorganic Materials V , 2004 , FF9.5
Copyright
Copyright © Materials Research Society 2005

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References

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