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Type: Artigo de periódico
Title: Ionic Conductivity And Structural Characterization Of Na1.5nb0.3zr1.5(po4)3 With Nasicon-type Structure
Author: Verissimo C.
Garrido F.M.S.
Alves O.L.
Calle P.
Martinez-Juarez A.
Iglesias J.E.
Rojo J.M.
Abstract: The NASICON-type Na1.5Nb0.3Zr1.5(PO4)3 was prepared by solid state reaction of Nb2O5 and the precursor γ-NaHZr(PO4)2 at 700°C. The EPR spectra showed a signal with a g factor of 1.984 assigned to Nb (IV) species in octahedral oxygen environments. The X-ray powder diffraction pattern obtained with monochromatic radiation was indexed on the basis of a rhombohedral cell, the hexagonal parameters being aH = 8.8061(2) and cH = 22.7638(7) Å. The Na+ ion conduction was measured by the complex impedance method (frequency range: 0.1-105 Hz; temperature range: 20-500°C) on four pellets previously sintered at 450, 750, 900 and 1000°C. The conductivity data are discussed in relation to the sintering temperature. An activation energy of 0.60 eV for the movement of Na+ ions in the NASICON framework has been found.
Rights: fechado
Identifier DOI: 
Date Issue: 1997
Appears in Collections:Unicamp - Artigos e Outros Documentos

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