Sol–gel preparation and characterization of non-substituted and Sr-substituted gadolinium cobaltates

An aqueous sol–gel chemistry approach for the preparation of Sr-substituted perovskite gadolinium cobaltates Gd 1− x Sr x CoO 3−δ ( x = 0.0, 0.25, 0.5 and 0.75) has been applied. The metal ions, generated by dissolving starting materials in diluted acetic acid were complexed by EDTA to obtain the pr...

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Bibliographic Details
Published in:Materials chemistry and physics 2011-02, Vol.125 (3), p.469-473
Main Authors: Cizauskaite, S., Johnsen, S., Jørgensen, J.-E., Kareiva, A.
Format: Article
Language:English
Subjects:
Diffraction
Dissolution
EDTA
Gadolinium
Gadolinium cobaltates
Heating
Metal ions
Perovskites
Scanning electron microscopy
Sol gel process
Sol–gel synthesis
Strontium
Strontium substitution
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Summary:An aqueous sol–gel chemistry approach for the preparation of Sr-substituted perovskite gadolinium cobaltates Gd 1− x Sr x CoO 3−δ ( x = 0.0, 0.25, 0.5 and 0.75) has been applied. The metal ions, generated by dissolving starting materials in diluted acetic acid were complexed by EDTA to obtain the precursors for non-substituted and Sr-substituted GdCoO 3. However, only two single-phase cobaltate samples with x = 0.0 and 0.25 have been obtained by the suggested sol–gel method. The influences of synthesis temperature and the amount of substituent on the phase purity of Gd 1− x Sr x CoO 3−δ were investigated. The evolution of the gels during heating, composition and micro-structural features in the polycrystalline samples was studied by thermal analysis (TG/DSC), infrared spectroscopy (IR), powder X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM).
ISSN:0254-0584
1879-3312
DOI:10.1016/j.matchemphys.2010.10.031