Structure, Dielectric and Spectroscopic Investigation

of (Sr1-x Nax) 0.8(K1-x Lnx) 0.4Nb2O6 with (Ln =Nd, Eu)

 

                  M. Zriouil1,   A. Lahmar1, 2, E. Antic-Fidancev3, P. Ashehoug3, T. Fukami4, B. Elouadi2*

1 Applied Solid State Chemistry Laboratory, Faculty of Sciences, Charia Ibn Batouta, B. P. 1014, Rabat, Morocco

2 Laboratoire d'Elaboration, Analyse Chimique et Ingénierie des Matériaux (LEACIM), Université de La Rochelle,

avenue Michel Crépeau, 17042 La Rochelle Cedex01, France

3 Laboratoire de Chimie Appliquée de l'Etat Solide ENSCP Matériaux Inorganiques

(CNRS UMR 7574) 11, rue P. et M. Curie 75231 PARIS cedex 05 , France

4 Departement of Electronic Engineering, Fucalty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan

* Corresponding author. E-mail: zriouil@fsr.ac.ma

Received: 26 June 2008; revised version accepted: 27 July 2008

 

Abstract

     The present work aims to analyse the influence of rare earth ions on the microstructure, phase transition and optical properties of K0.4Sr0.8 Nb2O6- based ceramics, crystallizing with the tetragonal tungsten bronze structure. The incorporation of such cations was found to decrease the maximum of the thermal plot of the dielectric constants. When the molar fraction of lanthanide ions is increased, a broadening was observed for the peaks of both the emission spectra and dielectric constants plots er’(T) .

 

Keywords: Niobates Tungsten Bronze Structure; SEM; Dielectric Properties; Europium luminescence.

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