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Study of A and B sites order in lanthanide-doped lead titanate ferroelectric system

  • A. Pentón-Madrigal (a1), Y. Mendez-González (a1), A. Peláiz-Barranco (a1), F. Calderón-Piñar (a1), L. A. S. de Oliveira (a2), J. Belhadi (a3) and Y. Gagou (a3)...


Pb0.88 Ln 0.08TiO3 ferroelectric system, where Ln = La, Sm, Eu, and Dy, has been characterized using Scanning Electron Microscopy, Raman spectroscopy, and X-ray diffraction experiments. Softening of the lowest transverse optical phonon mode E (1TO) was evaluated as a function of the rare earths’ ionic radius suggesting partial occupation of lanthanide ions at the A and B sites of the perovskite structure. Using Rietveld refinements, it has been established a higher incorporation of Ln3+ ions into the A sites of the perovskite structure than that of the B sites for the studied ceramics. The occupation at B sites increases slightly with the decreases of the ionic radii of the lanthanides.


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