Intraphase chemical diffusion of water in Ba4Ca2Nb2O11 / Animitsa IE,Neiman AY,Kochetova NA,Korona DV // RUSSIAN JOURNAL OF ELECTROCHEMISTRY. - 2006. - V. 42, l. 4. - P. 311-319.

ISSN/EISSN:

1023-1935 / нет данных

Type:

Article

Abstract:

The kinetics and mechanism of the water incorporation in binary perovskite (elpasolite) Ba4Ca2Nb2O11 are studied in the temperature interval 300-500 degrees C at aH(2)O = 1 x 10(-3) to 2.2 x 10(-2). The product of hydration at these temperatures and values of aH(2)O is a solid solution of the composition Ba4Ca2Nb2O11 . xH(2)O (x < 0.5). The process of interaction with water vapor is shown to be limited by the intraphase diffusion of hydrogen- and oxygen-containing species that enter the composition of H2O. Coefficients of chemical diffusion of water DH2O are estimated from relaxation dependences of weight upon a stage-by-stage change of humidity log a H2O -3.0 -> -2.5 -> -2.0 -> -1.6. It is established that the coefficients of chemical diffusion of water for Ba4Ca2Nb2O11 . xH(2)O at 0.1 < x < 0.5 insignificanfly increases with increasing x. The chemical diffusion of water for the composition Ba4CaNb2O11 . 0.35H(2)O is characterized by an activation energy of 0.38 eV. Given joint transfer of O2- and H+, the last value suggests that protons may exert an influence on the rate and energy of migration of oxygen. Possible forms of proton-containing species in the case of migration in experiments on chemical diffusion are discussed.

Author keywords:

chemical diffusion of water; oxygen and proton conduction OXYGEN DIFFUSION; PROTON; CONDUCTIVITY; COEFFICIENT; BACEO3

DOI:

10.1134/S1023193506040057

Web of Science ID:

ISI:000237052600005

Соавторы в МНС:

Другие поля

Поле	Значение
Month	APR
Publisher	MAIK NAUKA/INTERPERIODICA/SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013-1578 USA
Language	English
Keywords-Plus	OXYGEN DIFFUSION; PROTON; CONDUCTIVITY; COEFFICIENT; BACEO3
Research-Areas	Electrochemistry
Web-of-Science-Categories	Electrochemistry
Author-Email	arkady.neiman@usu.ru
Number-of-Cited-References	17
Usage-Count-Since-2013	1
Journal-ISO	Russ. J. Electrochem.
Doc-Delivery-Number	036EA