Effect of hydration on conductivity of Ba4La (x) Ca2-x Nb2O11+0.5x (x=0.5, 1, 1.5, 2) phases / Korona D. V.,Kutikov I. M.,Neiman A. Ya // RUSSIAN JOURNAL OF ELECTROCHEMISTRY. - 2013. - V. 49, l. 12. - P. 1171-1180.

ISSN/EISSN:

1023-1935 / 1608-3342

Type:

Article

Abstract:

Substitution of Ca by La in initial cubic double perovskite Ba-4(Ca2Nb2)O-11{[}VO](1) allowed obtaining phases with a similar structure with a lower content of structural oxygen vacancies, Ba-4(La (x) Ca2 - x Nb-2)O11 + 0.5x {[}VO](1 - 0.5x) (x = 0.5, 1, 1.5, 2). The impedance technique was used to measure the temperature dependences of conductivity in the atmosphere of dry and humid air. Transport numbers determined using the EMF method in an oxygen-air and water steam concentration cells point to the predominantly hole nature of conductivity in the high-temperature region (T > 600A degrees C) and to predominance of proton conductivity in the low-temperature region. Activation energies of hole and proton conductivity were calculated. Thermogravimetric measurements were carried out under heating from 25 to 1000A degrees C with simultaneous mass-spectrometric determination of evolved H2O and CO2. The properties of the studied Ba-4(La (x) Ca2 - x Nb-2)O11 + 0.5x (x = 0.5, 1, 1.5, 2) phases were compared with the earlier studied Ba4 - x La (x) (Ca2Nb2)O11 + 0.5x phases with similar lanthanum content.

Author keywords:

double perovskite; oxygen vacancies; proton conductivity; impedance; transport numbers; thermogravimetry EFFECTIVE IONIC-RADII; BA4CA2NB2O11; NIOBATES; PROTON; WATER

DOI:

10.1134/S1023193512110079

Web of Science ID:

ISI:000328219800010

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	DEC
Publisher	MAIK NAUKA/INTERPERIODICA/SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013-1578 USA
Language	English
EISSN	1608-3342
Keywords-Plus	EFFECTIVE IONIC-RADII; BA4CA2NB2O11; NIOBATES; PROTON; WATER
Research-Areas	Electrochemistry
Web-of-Science-Categories	Electrochemistry
Author-Email	Danil.Korona@usu.ru
Funding-Acknowledgement	Russian Foundation for Basic Research {[}10-03-01149-a, 08-03-00144]; Ministry of Education and Science of the Russian Federation
Funding-Text	The work was supported by the Russian Foundation for Basic Research (projects no. 10-03-01149-a and 08-03-00144) and Ministry of Education and Science of the Russian Federation under the Federal Target Program ``Scientific and Scientific-Pedagogical Resources of Innovative Russia in 2009-2013,{''} and Federal Target Program ``Development of Scientific Potential of the Higher School in 2009-2010.{''}
Number-of-Cited-References	10
Usage-Count-Last-180-days	1
Usage-Count-Since-2013	4
Journal-ISO	Russ. J. Electrochem.
Doc-Delivery-Number	269DB