Conductivity and hydration of lanthanum-substituted barium calcium niobates Ba4-xLaxCa2Nb2O11+0.5x (x=0.5; 1; 1.5) / Korona D. V.,Neiman A. Ya. // RUSSIAN JOURNAL OF ELECTROCHEMISTRY. - 2011. - V. 47, l. 6. - P. 737-747.

ISSN/EISSN:

1023-1935 / нет данных

Type:

Article

Abstract:

A double perovskite Ba-4(Ca2Nb2)O-11 known as the oxygen-ionic and protonic conductor is modified by substitution of La atoms for Ba atoms in its composition. Three phases with different lanthanum contents Ba4 - x La (x) Ca2Nb2O11 + 0.5x with x = 0.5; 1; 1.5 are studied. The temperature dependences of conductivity are measured and the thermogravimetric studies are carried out. The thermogravimetric curves of heating are close for all three compounds, whereas their curves of cooling strongly differ from one another. For compositions with x = 0.5 and 1.5, the dependences of conductivity on the partial oxygen pressure P-O2 and the partial water vapor pressure P-H2O are measured. The total transport numbers of ions and the transport numbers of protons are calculated. It is shown that the slope of the log sigma(tot)(log P-H2O)(T) dependence reaches 1/3 in the range of medium P-H2O under the condition of electroneutrality 2{[}O-V{''}] = {[}H-i center dot], which coincides with the result obtained earlier for the Ba4Ca2Nb2O11 (x = 0) composition and the solid solutions on its basis with different Ba/Ca ratios. The obtained results are compared with the literature data describing the incorporation of water into Ba2In2O5 and BaCe0.89(Y-0.2)O-2.9.

Author keywords:

double perovskite; oxygen vacancies; partial water pressure; protonic conductivity OXIDE-ION CONDUCTIVITY; PROTON; OXYGEN; WATER; BA4CA2NB2O11; BA2IN2O5; SYSTEM; DIFFUSION; RADII

DOI:

10.1134/S1023193511060048

Web of Science ID:

ISI:000292271000015

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	JUN
Publisher	MAIK NAUKA/INTERPERIODICA/SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013-1578 USA
Language	English
Keywords-Plus	OXIDE-ION CONDUCTIVITY; PROTON; OXYGEN; WATER; BA4CA2NB2O11; BA2IN2O5; SYSTEM; DIFFUSION; RADII
Research-Areas	Electrochemistry
Web-of-Science-Categories	Electrochemistry
Author-Email	danil.korona@usu.ru
Funding-Acknowledgement	Russian Foundation of Basic Research {[}10-03-01149-a, 08-03-00144]; Ministry of Education and Science of the Russian Federation
Funding-Text	This study was financially supported by the Russian Foundation of Basic Research (grants nos. 10-03-01149-a and 08-03-00144) and also by the Ministry of Education and Science of the Russian Federation within the frames of the Federal Target Programs ``Research and Pedagogical Cadres of Innovative Russia for 2009-2013{''} and ``Development of the Scientific Potential of Higher School for 2009-2010{''}.
Number-of-Cited-References	19
Usage-Count-Since-2013	5
Journal-ISO	Russ. J. Electrochem.
Doc-Delivery-Number	785ZF