Chemical diffusion of water in the double perovskites Ba4Ca2Nb2O11 and Sr6Ta2O11 / Animitsa I.,Neiman A.,Kochetova N.,Korona D.,Sharafutdinov A. // SOLID STATE IONICS. - 2006. - V. 177, l. 26-32. - P. 2363-2368.

ISSN/EISSN:

0167-2738 / нет данных

Type:

Article; Proceedings Paper

Abstract:

The mechanism and kinetics of water incorporation in the double perovskites Ba4Ca2Nb2O11 and Sr6Ta2O11 has been investigated (T=300 divided by 500 degrees C and aH(2)O = 1 . 10(-3)divided by 2.2 . 10(-2)). The formation of hydration products Ba4Ca2Nb2O11 center dot xH(2)O and Sr6Ta2O11 center dot xH(2)O (0.2 < x < 0.50) was limited by the diffusion of H2O, It has been found that the concentration dependences of D-H2O are the same for both samples: small increasing of D-H2O With increasing x. The temperature dependences of the chemical diffusion coefficients of water for compositions of Ba4Ca2Nb2O11 center dot 0.35H(2)O and Sr6Ta2O11 center dot 0.35H(2)O could be described with close activation energies of E-a=0.38 +/- 0.03 eV and E-a =0.49 +/- 0.03 eV, respectively. The chemical diffusion coefficients of water are nearly one order of magnitude smaller for tantalate Sr6Ta2O11. This result correlates with lower oxygen and proton conductivities in Sr6Ta2O11 as the consequence of lower mobilities. (c) 2006 Elsevier B.V. All rights reserved.

Author keywords:

double perovskites; chemical diffusion coefficients of water OXYGEN DIFFUSION; PROTON; CONDUCTIVITY; COEFFICIENT; BACEO3; STATE

DOI:

10.1016/j.ssi.2006.07.005

Web of Science ID:

ISI:000242611800031

Соавторы в МНС:

Другие поля

Поле	Значение
Month	OCT 31
Note	15th International Conference on Solid State Ionics, Baden Baden, GERMANY, 2005
Publisher	ELSEVIER SCIENCE BV
Address	PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language	English
Keywords-Plus	OXYGEN DIFFUSION; PROTON; CONDUCTIVITY; COEFFICIENT; BACEO3; STATE
Research-Areas	Chemistry; Physics
Web-of-Science-Categories	Chemistry, Physical; Physics, Condensed Matter
Author-Email	irina.animitsa@usu.ru
Number-of-Cited-References	20
Usage-Count-Last-180-days	2
Usage-Count-Since-2013	8
Journal-ISO	Solid State Ion.
Doc-Delivery-Number	113QG