Artículo
Synthesis of new double perovskites La1.98Mn1.11Mo0.89O5.93 and La1.92Mn1.29Mo0.71O5.84: Characterization of structural and magnetic properties
Fuster, Valeria de Los Angeles
; Blanco, Marìa Cecilia
; Franco, Diego Gaspar
; Tirao, German Alfredo
; Nassif, Vivian; Nieva, Gladys Leonor
; Carbonio, Raul Ernesto
Fecha de publicación:
05/10/2016
Editorial:
Elsevier Science Sa
Revista:
Journal of Alloys and Compounds
ISSN:
0925-8388
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
The synthesis, structural and magnetic characterization of two new perovskites La1.98Mn1.11Mo0.89O5.93 and La1.92Mn1.29Mo0.71O5.84 are reported. Combined Rietveld refinements of X-ray and neutron powder diffraction data indicate that both samples are monoclinic perovskites with space group P21/n. The distribution of the transition metals over the octahedral sites is highly ordered: Mn preferentially occupies 2c sites, while Mo mostly occupies 2d sites. Mn oxidation states were determined by means of high resolution Kβ Emission Spectroscopy. The susceptibility as a function of temperature measurements and hysteresis loops show complex magnetic behaviour of both perovskites. The refined magnetic cells indicate that La1.98Mn1.11Mo0.89O5.93 is ferrimagnetic as a result of the antiferromagnetic coupling of two ferromagnetic sub-lattices associated to 2d and 2c sites, while La1.92Mn1.29Mo0.71O5.84 is ferromagnetic due to ferromagnetic alignment of the two sub-lattices. The magnetic overall behaviour of the latter perovskite is interpreted in terms of delocalization of magnetic moments arising from ferromagnetic double-exchange interactions between Mn2+ and Mn3+.
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Articulos(CCT - PATAGONIA NORTE)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Articulos(IFEG)
Articulos de INST.DE FISICA ENRIQUE GAVIOLA
Articulos de INST.DE FISICA ENRIQUE GAVIOLA
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Articulos de INST.DE FISICA DE ROSARIO (I)
Articulos de INST.DE FISICA DE ROSARIO (I)
Articulos(INFIQC)
Articulos de INST.DE INVESTIGACIONES EN FISICO- QUIMICA DE CORDOBA
Articulos de INST.DE INVESTIGACIONES EN FISICO- QUIMICA DE CORDOBA
Citación
Fuster, Valeria de Los Angeles; Blanco, Marìa Cecilia; Franco, Diego Gaspar; Tirao, German Alfredo; Nassif, Vivian; et al.; Synthesis of new double perovskites La1.98Mn1.11Mo0.89O5.93 and La1.92Mn1.29Mo0.71O5.84: Characterization of structural and magnetic properties; Elsevier Science Sa; Journal of Alloys and Compounds; 681; 5-10-2016; 444-454
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