Stability and thermal expansion of Na+-conducting ceramics
authors Smirnova, OA; Fuentes, RO; Figueiredo, F; Kharton, VV; Marques, FMB
nationality International
journal JOURNAL OF ELECTROCERAMICS
author keywords sodium cationic conductor; impedance spectroscopy; air humidity; thermal expansion; ceramic microstructure
keywords NEUTRON POWDER DIFFRACTION; OXYGEN-ION CONDUCTORS; FORMER SOVIET-UNION; ELECTRICAL-PROPERTIES; SOLID ELECTROLYTES; O2 STRUCTURE; CO2 SENSOR; NASICON; OXIDES; WATER
abstract An impedance spectroscopy study of sodium cation-conducting ceramics, including layered compounds Na0.8Ni0.4Ti0.6O2, Na0.8Fe0.8Ti0.2O2, Na0.8Ni0.6Sb0.4O2 (structural type O-3), Na0.68Ni0.34Ti0.66O2 (P2 type), and NASICON-type Na3Si2Zr1.88Y0.12PO11.94 and Na3.2Si2.2Zr1.88Y0.12P0.8O11.94, showed that their transport properties are essentially independent of partial water vapor pressure at temperatures above 420 K. In the low-temperature range, increasing vapor partial pressure from approximately 0 ( dry air) up to 0.46 atm. leads to a reversible increase in the conductivity. The sensitivity of studied materials to air humidity is strongly affected by the ceramic microstructure, being favored by larger boundary area and porosity. Maximum stability in wet atmospheres was found for NASICON ceramics, which also exhibit the highest cationic conduction. The average thermal expansion coefficients at 300-1173 K are in the range (13.7-16.0) x 10(-6) K-1 for the layered materials and (5.9-6.5) x 10(-6) K-1 for NASICON-type ceramics.
publisher KLUWER ACADEMIC PUBL
issn 1385-3449
year published 2003
volume 11
issue 3
beginning page 179
ending page 189
digital object identifier (doi) 10.1023/B:JECR.0000026373.56703.b0
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000221178100008
  ciceco authors
  impact metrics
journal analysis (jcr 2019):
journal impact factor 2.588
5 year journal impact factor 1.735
category normalized journal impact factor percentile 76.786
dimensions (citation analysis):
altmetrics (social interaction):



 


Sponsors

1suponsers_list_ciceco.jpg