Assessment of stability and protonic conduction in NASICON ceramics

authors	Fuentes, RO; Smirnova, OA; Kharton, VV; Figueiredo, FM; Marques, FM
nationality	International
journal	JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
author keywords	conductivity; impedance spectroscopy; microstructure-final; NASICON; powders-solid state reaction; proton conduction
keywords	IMPEDANCE SPECTROSCOPY; CO2 SENSOR; WATER
abstract	NASICON-type Na3Si2Zr1.88Y0.12PO11.94 and Na3.2Si2.2Zr1.88Y0.12P0.8O11.94 ceramics were obtained by a standard ceramic route. The structural and microstructural analysis of materials processed tinder different conditions suggested that the amount of Na- and P-rich liquid phases formed during the high temperature sintering is smaller for Na3.2Si2.2Zr1.88Y0.12P0.8O11.94. Indeed, samples of this composition showed a considerably worse sinterability. Total conductivity values obtained as a function of the humidity content show no evidence for protonic conduction in NASICON between 373 and 473 K. Results obtained at lower temperatures are not conclusive due to the significant degradation of the electrolyte/electrode interfaces and surfaces in wet atmospheres. (C) 2003 Elsevier Ltd. All rights reserved.
publisher	ELSEVIER SCI LTD
issn	0955-2219
year published	2004
volume	24
issue	10-11
beginning page	3049
ending page	3055
digital object identifier (doi)	10.1016/j.jeurceramsoc.2003.10.040
web of science category	Materials Science, Ceramics
subject category	Materials Science
unique article identifier	WOS:000222117700018