Structural and Magnetic Properties of La{sub 1−x}(Ca,Sr){sub x}MnO{sub 3} Powders Produced by the Hydrothermal Method

La{sub 1−x}(Ca,Sr){sub x}MnO{sub 3} manganites have been produced using the hydrothermal method. The influence of the concentration of La, Ca, and Sr on the structural, morphological, and magnetic properties was studied and analyzed. The X-ray diffraction analysis showed that samples crystallized in...

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Bibliographic Details
Published in:Journal of superconductivity and novel magnetism 2018-12, Vol.31 (12)
Main Authors: Londoño-Calderón, V., Rave-Osorio, L. C., Restrepo, J., Játiva, J., Jurado, J. F., Arnache, O., Restrepo-Parra, E.
Format: Article
Language:English
Subjects:
CALCIUM
CONCENTRATION RATIO
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CURIE POINT
HYDROTHERMAL SYNTHESIS
LANTHANUM
LANTHANUM COMPOUNDS
MAGNETIC PROPERTIES
MANGANATES
MANGANESE IONS
MICROSTRUCTURE
OXYGEN
POWDERS
SCANNING ELECTRON MICROSCOPY
SPECTROSCOPY
STOICHIOMETRY
STRONTIUM
SYMMETRY
TEMPERATURE RANGE 0065-0273 K
TRIGONAL LATTICES
X-RAY DIFFRACTION
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Summary:La{sub 1−x}(Ca,Sr){sub x}MnO{sub 3} manganites have been produced using the hydrothermal method. The influence of the concentration of La, Ca, and Sr on the structural, morphological, and magnetic properties was studied and analyzed. The X-ray diffraction analysis showed that samples crystallized in rhombohedral or trigonal symmetries depending on the stoichiometry. The morphological analyses obtained by using scanning electron microscopy showed cauliflower-type microstructures in all samples. Energy-dispersive spectroscopy studies were also performed, evidencing not only the presence of the constituent elements but an oxygen deficiency and manganese-relative excess in all the samples. This fact is suggested as the cause of the unusual magnetic behavior where a low-temperature re-entrant phase was observed within the ferromagnetic matrix in some of the samples attributed to spin frustration. Furthermore, for some samples, a critical Curie temperature higher than the reported values is attributed to the relative excess of manganese ions, which can occupy other sites in the lattices as interstices or La, Ca, and Sr sites.
ISSN:1557-1939
1557-1947
DOI:10.1007/S10948-018-4625-8