Effect of oxygen activity in the gaseous phase on the mechanism of reactions in the solid-state synthesis of In-2(WO4)(3) and In6WO12 / Neiman A. Ya.,Kartseva E. V.,Pestereva N. N.,Fedorova L. M. // RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A. - 2011. - V. 85, l. 11. - P. 1885-1890.

ISSN/EISSN:

0036-0244 / нет данных

Type:

Article

Abstract:

The effect of oxygen's activity on the rate of In-2(WO4)(3) and In6WO12 formation reactions was studied to determine the reaction mass transfer mechanism. It was established that the formation of In-2(WO4)(3) in a model reaction cell is due to the transfer of WO (4) (2-) components and electrons moving in opposite directions through the reaction product. The relation between the diffusion coefficients of the carriers was found. The rate of electron diffusion and the reaction rate were shown to vary according to the law K-p approximate to D-lim = D-e similar to a(O2)(-1/4). We conclude that the formation of electronic conductor In6WO12 is a two-region process: at the In-2(WO4)(3) | In6WO12 interface, the product is formed on the In-2(WO4)(3) surface due to \{WO3\} escaping toward In2O3, and at the In6WO12 | In2O3 interface, the product is formed on the In2O3 surface via the reaction of diffuse \{WO3\} with In2O3. The probable relationship between the diffusion coefficients of the In6WO12 components was obtained. A relation was developed for the process rate. The diffusion coefficients for the limiting component were calculated using the data on the estimated thickness of the product layers.

Author keywords:

reaction-associated diffusion; polyanionic transfer; relationship of charge carrier and mass carrier mobilities; nature of product conductance; effect of oxygen's activity ION CONDUCTION; SC-2(WO4)(3)-TYPE STRUCTURE; TRIVALENT; SYSTEM; ELECTROLYTES; DIFFUSION; TRANSPORT

DOI:

10.1134/S0036024411110239

Web of Science ID:

ISI:000295697100005

Соавторы в МНС:

Другие поля

Поле	Значение
Month	NOV
Publisher	MAIK NAUKA/INTERPERIODICA/SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013-1578 USA
Language	English
Keywords-Plus	ION CONDUCTION; SC-2(WO4)(3)-TYPE STRUCTURE; TRIVALENT; SYSTEM; ELECTROLYTES; DIFFUSION; TRANSPORT
Research-Areas	Chemistry
Web-of-Science-Categories	Chemistry, Physical
Author-Email	Arkady.Neiman@usu.ru
Funding-Acknowledgement	RF Ministry of Education and Science; federal target program Developing the Scientific Potential of Higher Education; Russian Foundation for Basic Research {[}06-03-90170-NNF, 08-03-00144]
Funding-Text	This work was supported by the RF Ministry of Education and Science's program Scientists and Science Teachers of an Innovative Russia, 2009-2013; by the federal target program Developing the Scientific Potential of Higher Education, 2009-2010; and by the Russian Foundation for Basic Research, project nos. 06-03-90170-NNF and 08-03-00144.
Number-of-Cited-References	20
Usage-Count-Last-180-days	1
Usage-Count-Since-2013	8
Journal-ISO	Russ. J. Phys. Chem. A
Doc-Delivery-Number	830YZ