Artículo
Synthesis, structural characterization and Mössbauer study of LnV 0.5Fe 0.5O 3 perovskites (Ln = Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho and Er)
Ivashita, Flávio F.; Biondo, Valdecir; Bellini, Jusmar V.; Paesano Jr., Andrea; Blanco, Marìa Cecilia
; Fuertes, Valeria Cintia
; Pannunzio Miner, Elisa Victoria
; Carbonio, Raul Ernesto
Fecha de publicación:
09/2012
Editorial:
Pergamon-Elsevier Science Ltd
Revista:
Materials Research Bulletin
ISSN:
0025-5408
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Perovskites LnV 0.5Fe 0.5O 3 (Ln = Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho and Er) were synthesized by rapid solidification from arc-melted samples and characterized by the study of their crystal structure and hyperfine properties. These metastable solid solutions crystallized in the Pbnm symmetry, with the iron and vanadium cations randomly distributed in the transition metal octahedral sites. Depending on the lanthanide present at the A site of the perovskite, iron is present with two valences (i.e., Fe 3+ and Fe 2+). The volume of the unit cell for these perovskites increases linearly with the lanthanide ionic radius, as the perovskite approaches its ideal structure. At room temperature, the quadrupolar splitting of the trivalent paramagnetic Mössbauer component works as an indirect measurement for the Goldshmidt tolerance factor. Close to or below 100 K, these perovskites undergo a crystallographic phase transformation, probably due to orbital ordering of the V 3+ cations, originating two different magnetic iron sites. © 2012 Elsevier Ltd.
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Articulos(INFIQC)
Articulos de INST.DE INVESTIGACIONES EN FISICO- QUIMICA DE CORDOBA
Articulos de INST.DE INVESTIGACIONES EN FISICO- QUIMICA DE CORDOBA
Citación
Ivashita, Flávio F.; Biondo, Valdecir; Bellini, Jusmar V.; Paesano Jr., Andrea; Blanco, Marìa Cecilia; et al.; Synthesis, structural characterization and Mössbauer study of LnV 0.5Fe 0.5O 3 perovskites (Ln = Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho and Er); Pergamon-Elsevier Science Ltd; Materials Research Bulletin; 47; 9; 9-2012; 2227-2234
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