Hydrothermal synthesis of LaMnO3+δ: F.T.I.R. and W.A.X.S. investigations of the evolution from amorphous to crystallized powder

Pseudo-cubic LaMnO3+delta powders were obtained by pyrolysis of the amorphous residue of the hydrothermal treatment, at 150 C under autogeneous pressure, of lanthanum and manganese nitrates in the presence of citric acid. The pyrolysis steps were identified by coupled TGA-DTA determining also the ca...

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Bibliographic Details
Published in:Journal of materials science 2004-01, Vol.39 (8), p.2821-2826
Main Authors: BERNARD, C, DURAND, B, VERELST, M, LECANTE, P
Format: Article
Language:English
Subjects:
Carbon content
Chemistry
Citric acid
Colloidal state and disperse state
Crystallization
Evolution
Exact sciences and technology
General and physical chemistry
Hydrothermal treatment
Lanthanum
Lanthanum compounds
Manganese
Materials science
Perovskites
Powders
Pyrolysis
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Summary:Pseudo-cubic LaMnO3+delta powders were obtained by pyrolysis of the amorphous residue of the hydrothermal treatment, at 150 C under autogeneous pressure, of lanthanum and manganese nitrates in the presence of citric acid. The pyrolysis steps were identified by coupled TGA-DTA determining also the carbon content evolution. From FTIR and WAXS investigations of the amorphous powders calcined at various temperatures in the 200-1000 C range, it was shown that the crystallisation occurred slowly in the 550-700 C range and that the perovskite skeleton already existed in the amorphous citrate precursors formed by the hydrothermal treatment. 23 refs.
ISSN:0022-2461
1573-4803
DOI:10.1023/B:JMSC.0000021459.24971.91