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Thermal Annealing Effects in Vanadium Pentoxide Films Intercalated with Eu3+

Published online by Cambridge University Press:  10 February 2011

H. P. Oliveira ,
J. M. Rosolen ,
P. S. Calefi ,
C. A. Brunello  and
C. F. O. Graeff
H. P. Oliveira
Affiliation:
Departamento de Quimica, FFCLRP/Universidade de São Paulo, Ribeirão Preto, SP, CEP 14040–901, Brazil. (herepo@ffclrp.usp.br)
J. M. Rosolen
Affiliation:
Departamento de Quimica, FFCLRP/Universidade de São Paulo, Ribeirão Preto, SP, CEP 14040–901, Brazil.
P. S. Calefi
Affiliation:
Departamento de Quimica, FFCLRP/Universidade de São Paulo, Ribeirão Preto, SP, CEP 14040–901, Brazil.
C. A. Brunello
Affiliation:
Departamento de Física e Matemática, FFCLRP/Universidade de São Paulo.
C. F. O. Graeff
Affiliation:
Departamento de Física e Matemática, FFCLRP/Universidade de São Paulo.
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Abstract

This work reports on the spectroscopic properties of europium ions intercalated in a vanadium pentoxide matrix, as well as the effects of thermal treatment on its structural and electronic properties. X-ray diffraction, TG/DTA, ESR, luminescence as well as XANES were used in order to characterize the intercalation compound. For the as grown samples, the intercalation of Eu3+ is observed to have little effect in the V2O5 lamellar structure, however the inter-planar spacing grows from 1.19 nm to 1.33nm for a 10% Eu3+ content. The luminescence for the as grown samples are dominated by the host, the same happening with the ESR spectra. However ESR data show that the presence of Eu3+ in the host induces the partial reduction of vanadium to V4+ For samples treated above 873K the luminescence excitation spectra presents a new shoulder at 300 nm, which when excited shows emissions bands typical of the Eu3+ In ESR the same thermal treatments are marked by the appearance of a new broad line assigned to ferromagnetic EuO, as well as the partial oxidation of V4+ to V5+ This result may be correlated to suppression of Eu3+ luminescence due to the presence of water in the neighborhood of Eu3+.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 574: Symposia BB – Multicomponent Oxide Films for Electronics , 1999 , 137
Copyright
Copyright © Materials Research Society 1999

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References

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