Electric Properties of Solid Solutions Based on Strontium Tantalate with Perovskite-Type Structure. Oxygen-Ionic Conductivity / Animitsa I. E.,Kochetova N. A.,Neiman A. Ya. // RUSSIAN JOURNAL OF ELECTROCHEMISTRY. - 2010. - V. 46, l. 2. - P. 161-167.

ISSN/EISSN:

1023-1935 / нет данных

Type:

Article

Abstract:

Total conductivity of Sr(6-2x)Ta(2 + 2x)O(11 + 3x) (0 <= x <= 0.33) solid solutions with a cryolite structure is studied in the atmosphere with a low water vapor content under variation of the temperature (500 < T < 1000 degrees C) and oxygen activity in the gas phase (10(-18) < aO(2) < 0.21). Conductivity is divided into components. It is found that both the oxygen-ionic conductivity and the mobility of oxygen ions increase and the percentage of p-type electronic conductivity decreases at an increase in the concentration of oxygen vacancies. It is shown that compositions with a high strontium oxide content (0 <= x < 0.15) and accordingly high concentration of oxygen vacancies correspond to the maximum values of the oxygen-ionic conductivity and low activation energies. The Sr(6)Ta(2)O(11) and Sr(5.92)Ta(2.08)O(11.12) compositions in a wide range of aO(2) are characterized by negligibly low fractions of electronic conductivity component. For the compositions of x > 0.15, a transition occurs from the electrolytic region to mixed oxygen-hole conductivity character (at aO(2) = 0.21) at an increase in the oxygen activity.

Author keywords:

double perovskites; structure vacancies; oxygen-ionic conductivity TRANSPORT-PROPERTIES; PROTONIC CONDUCTORS; DEFECT STRUCTURE; NIOBATES; NONSTOICHIOMETRY

DOI:

10.1134/S1023193510020060

Web of Science ID:

ISI:000278122100006

Соавторы в МНС:

Другие поля

Поле	Значение
Month	FEB
Publisher	MAIK NAUKA/INTERPERIODICA/SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013-1578 USA
Language	English
Keywords-Plus	TRANSPORT-PROPERTIES; PROTONIC CONDUCTORS; DEFECT STRUCTURE; NIOBATES; NONSTOICHIOMETRY
Research-Areas	Electrochemistry
Web-of-Science-Categories	Electrochemistry
Author-Email	Nadezhda.Kochetova@usu.ru
Funding-Acknowledgement	Russian Foundation for Basic Research {[}07-08-00693-a]; Federal Agency on Science and Innovations
Funding-Text	The work was financially supported by the Russian Foundation for Basic Research, project no. 07-08-00693-a and Federal Agency on Science and Innovations.
Number-of-Cited-References	14
Usage-Count-Last-180-days	1
Usage-Count-Since-2013	8
Journal-ISO	Russ. J. Electrochem.
Doc-Delivery-Number	602EU