Experimental study of trivalent rare-earth element incorporation in CaTiO3 perovskite: evidence for a new substitution mechanism

Samples of calcium titanate perovskite (CaTiO 3 ) substituted with variable amounts of trivalent La, Pr, Nd or Sm were synthesized by solid-state reaction. The synthesized compounds were characterized by means of electron microprobe (EMPA), powder X-ray diffraction and µ-Raman spectroscopy. The inco...

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Bibliographic Details
Published in:Physics and chemistry of minerals 2019-11, Vol.46 (10), p.1003-1015
Main Authors: Goethals, Jules, Bedidi, Ali, Fourdrin, Chloé, Tarrida, Martine, Rossano, Stéphanie
Format: Article
Language:English
Subjects:
Calcium titanate
Chemical synthesis
Condensed Matter
Crystallography and Scattering Methods
Earth and Environmental Science
Earth Sciences
Electron probes
Geochemistry
Lanthanides
Materials Science
Mineral Resources
Mineralogy
Original Paper
Perovskites
Physics
Raman spectroscopy
Rare earth elements
Samarium compounds
Substitution reactions
X ray powder diffraction
X-ray diffraction
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Summary:Samples of calcium titanate perovskite (CaTiO 3 ) substituted with variable amounts of trivalent La, Pr, Nd or Sm were synthesized by solid-state reaction. The synthesized compounds were characterized by means of electron microprobe (EMPA), powder X-ray diffraction and µ-Raman spectroscopy. The incorporation of the studied lanthanides in the CaTiO 3 perovskite leads to the formation of complex (Ca 1-2x Ln 2x )(Ti 1-x Ca x )O 3 perovskites with a Pbnm disordered structure. This mechanism was revealed by the Ca/Ti ratio analyses of the samples, the study of the lattice parameter evolution and the Raman A 1g octahedral breathing mode frequency comparison for all systems.
ISSN:0342-1791
1432-2021
DOI:10.1007/s00269-019-01058-6