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Preparation of LaFeO3 particles by sol-gel technology

Published online by Cambridge University Press:  31 January 2011

C. Vázquez-Vázquez ,
P. Kögerler ,
M. A. López-Quintela ,
R. D. Sánchez  and
J. Rivas
C. Vázquez-Vázquez
Affiliation:
Department of Physical Chemistry, University of Santiago de Compostela, E-15706 Santiago de Compostela, Spain
P. Kögerler
Affiliation:
Department of Physical Chemistry, University of Santiago de Compostela, E-15706 Santiago de Compostela, Spain
M. A. López-Quintela
Affiliation:
Department of Physical Chemistry, University of Santiago de Compostela, E-15706 Santiago de Compostela, Spain
R. D. Sánchez
Affiliation:
Department of Applied Physics, University of Santiago de Compostela, E-15706 Santiago de Compostela, Spain
J. Rivas
Affiliation:
Department of Applied Physics, University of Santiago de Compostela, E-15706 Santiago de Compostela, Spain
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Extract

The study of submicroscopic particles in already known systems has resulted in a renewed interest due to the large differences found in their properties when the particle size is reduced, and because of possible new technological applications. In this work we report the preparation of LaFeO3 particles by the sol-gel route, starting from a solution of the corresponding metallic nitrates and using urea as gelificant agent. Gels were decomposed at 200 °C and calcined 3 h at several temperatures, T, in the range 250–1000 °C. The samples were structurally characterized by x-ray diffraction (XRD) showing that the orthoferrite crystallizes at T as low as 315 °C. From the x-ray diffraction peak broadening, the particle size was determined. The size increases from 60 to 300 nm as the calcination T increases. Infrared spectroscopy was used to characterize gels and calcined samples. From these studies a mechanism for the gel formation is proposed. Study of the magnetic properties of LaFeO3 particles shows the presence of a ferromagnetic component which diminishes as the calcination temperature increases, vanishing at T = 1000 °C.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 2 , February 1998 , pp. 451 - 456
Copyright
Copyright © Materials Research Society 1998

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