Submicrometric NASICON ceramics with improved electrical conductivity obtained from mechanically activated precursors
authors Fuentes, RO; Figueiredo, FM; Soares, MR; Marques, FMB
nationality International
journal JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
author keywords mechanical activation; grain size; electrical conductivity; NASICON; sensors; ionic conductivity; Na3Si2(Zr,Y)(2)Po-12
keywords MECHANOCHEMICAL SYNTHESIS; SENSOR
abstract Na3Si2Zr1.88Y0.12PO11.94 was for the first time synthesised using mechanically activated mixtures of (ZrO2)(0.97)(Y2O3)(0.03), Na(3)PO(4)(.)12H(2)O and SiO2 aiming to lower the sintering temperature thus improving chemical homogeneity. The best result was obtained with powder mixtures activated in Teflon containers with partial amorphisation of the reactants attained after milling for 70 h at a maximum of 300 rpm, without significant contamination. The microstructure consists of 300-500 nm agglomerates of smaller grains with size in the range 50-100 nm. Dense, single phase ceramics with submicrometric grain size were obtained from the activated mixture after sintering at 1050degreesC for 10 h. The ionic conductivity of these ceramics is 2.5 x 10(-3) S cm(-1) at room temperature, and 0.24 S cm(-1) at 300degreesC. These values are higher than those obtained with non-activated solid state reaction samples and amongst the highest reported in the literature. (C) 2004 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0955-2219
year published 2005
volume 25
issue 4
beginning page 455
ending page 462
digital object identifier (doi) 10.1016/j.neurcermaoc.2004.02.019
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000226924100018
  ciceco authors
  impact metrics
journal analysis (jcr 2019):
journal impact factor 4.495
5 year journal impact factor 4.283
category normalized journal impact factor percentile 98.214
dimensions (citation analysis):
altmetrics (social interaction):



 


Sponsors

1suponsers_list_ciceco.jpg