Conductivity and hydration of fluorite-type La6-x WO12-1.5x phases (x=0.4; 0.6; 0.8; 1) / Partin G. S.,Korona D. V.,Neiman A. Ya.,Belova K. G. // RUSSIAN JOURNAL OF ELECTROCHEMISTRY. - 2015. - V. 51, l. 5. - P. 381-390.

ISSN/EISSN:

1023-1935 / 1608-3342

Type:

Article

Abstract:

Solid-phase synthesis was used to obtain four phases from the region of cubic fluorite-type La6WO12-La10W2O21 (La5WO10.5) solid solution. The temperature dependence of conductivity was measured using the impedance spectroscopy technique in the atmosphere of dry and humid air and also when was varied from 0.21 to 10(-20) atm. Ionic transport numbers t (ion) are calculated (0.6 to 0.9). It was shown that the La5.6WO11.4 phase had a relatively high stability towards hydrolysis, as the value of its conductivity dropped negligibly (as compared to other studied samples) after long-term sample conditioning in a humid atmosphere. Activation energies of hole (0.85 to 0.98 eV) and proton (0.49 to 0.56 eV) conductivity were calculated. The method of thermogravimetric analysis was used to determine the phase hydration degree in the course of cooling from 980 to 200A degrees C at . Hydration enthalpies Delta H (hydr) (52 to 67 kJ/mol) were calculated.

Author keywords:

La6WO12; double fluorite; proton conductivity; oxygen vacancies; impedance; thermogravimetric analysis; hydration enthalpy PROTON; DEFECTS; SYSTEM

DOI:

10.1134/S1023193515050092

Web of Science ID:

ISI:000355411900001

Соавторы в МНС:

Другие поля

Поле	Значение
Month	MAY
Publisher	MAIK NAUKA/INTERPERIODICA/SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013-1578 USA
Language	English
EISSN	1608-3342
Keywords-Plus	PROTON; DEFECTS; SYSTEM
Research-Areas	Electrochemistry
Web-of-Science-Categories	Electrochemistry
Author-Email	D.V.Korona@urfu.ru
Funding-Acknowledgement	Ural Federal University
Funding-Text	The work was financially supported by Ural Federal University as part of implementation of the Program of Development of Ural Federal University for the winners of the competition of ``Young Scientists of Ural Federal University{''}. The results were obtained as part of the work on the State Assignment of Ministry of Education and Science of the Russian Federation no. 4.1039.2014/K.
Number-of-Cited-References	10
Usage-Count-Last-180-days	1
Usage-Count-Since-2013	13
Journal-ISO	Russ. J. Electrochem.
Doc-Delivery-Number	CJ3VI