Conductivity of Composite Materials Based on Me-2(WO4)(3) and WO3 (Me = Sc, In) / Neiman A. Ya.,Karapetyan A. V.,Pestereva N. N. // RUSSIAN JOURNAL OF ELECTROCHEMISTRY. - 2014. - V. 50, l. 1. - P. 58-69.

ISSN/EISSN:

1023-1935 / 1608-3342

Type:

Article

Abstract:

Composites \{Me-2(WO4)(3) - xWO(3)\} (Me = Sc, In) (x = 0.5-99\%) are synthesized and characterized by XRD and electron microscopy methods and also by the density and specific surface measurements. Temperature dependences of the total conductivity of composites are measured. The contributions of sigma(tot) and sigma(el) are assessed by the sigma(a(O2)) and EMF methods. The concentration dependences of conductivity and activation energy are plotted based on the sigma(tot) and sigma(ion) data. It is shown that (a) in the interval x = 0-30 vol \% WO3 (0-70 mol \%), the conductivity is independent of composition and the ionic component prevails; (b) in the interval x = 60-94.5 vol \% (90-99 mol \%), the electron conductivity prevails and increases with the increase in x; (c) in the x interval of 30-60 vol \% WO3 (70-90 mol \%), the conductivity is mixed, i.e., electron(n-type)-ionic; the latter region represents the transition interval from ionic to electron conductivity as x increases. These data are compared with the results obtained earlier for MeWO4-WO3 composites (Me = Ca, Sr, Ba). As regards the structural topology, the \{Me-2(WO4)(3) - xWO(3)\} composites pertain to the randomly distributed type. It is shown that in contrast to \{(MeWO4)-W-II center dot xWO(3)\} composites, the composites under study do not form the nonautonomous interface phase with the high ionic conductivity. The possible reasons for the observed differences in the topology and the conduction type of composites based on MeWO4 and Me-2(WO4)(3) are analyzed.

Author keywords:

eutectic composites; conduction type and its evolution with composition; dependence of conductivity of composition; temperature a(O2); metacomposite effect; composite topology IN2O3-WO3 SYSTEM; TRANSPORT; DIFFUSION; OXIDES

DOI:

10.1134/S1023193512110122

Web of Science ID:

ISI:000330794000008

Соавторы в МНС:

Другие поля

Поле	Значение
Month	JAN
Publisher	MAIK NAUKA/INTERPERIODICA/SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013-1578 USA
Language	English
EISSN	1608-3342
Keywords-Plus	IN2O3-WO3 SYSTEM; TRANSPORT; DIFFUSION; OXIDES
Research-Areas	Electrochemistry
Web-of-Science-Categories	Electrochemistry
Author-Email	arkady.neiman@usu.ru
Funding-Acknowledgement	Ministry of Education of the Russian Federation; Federal Target Program ``Development of Scientific Potential of Higher School{''}; Russian Foundation for Basic Research {[}06-03-90170-NNF, 08-03-00144, 11-03-01209-a]
Funding-Text	The study was carried out with the financial support from the Federal Target Program of the Ministry of Education of the Russian Federation ``Research and Pedagogical Cadres of Innovative Russia for 2009-2013,{''} Federal Target Program ``Development of Scientific Potential of Higher School in 2009-2013,{''} and the grants of the Russian Foundation for Basic Research nos. 06-03-90170-NNF, 08-03-00144, and 11-03-01209-a.
Number-of-Cited-References	20
Usage-Count-Last-180-days	2
Usage-Count-Since-2013	10
Journal-ISO	Russ. J. Electrochem.
Doc-Delivery-Number	AA0OH