Synthesis, Structure, and Electric Properties of Oxygen-Deficient Perovskites Ba3In2ZrO8 and Ba4In2Zr2O11 / Animitsa I. E.,Dogodaeva E. N.,Nokhrin S. S.,Kosareva O. A.,Neiman A. Ya // RUSSIAN JOURNAL OF ELECTROCHEMISTRY. - 2010. - V. 46, l. 7. - P. 734-740.

ISSN/EISSN:

1023-1935 / нет данных

Type:

Article

Abstract:

Perovskite phases Ba3In2ZrO8 and Ba4In2Zr2O11 with the nominal concentration of structural oxygen vacancies 1/9 and 1/12, respectively, were synthesized by solid-phase and solution methods. X-ray diffraction showed cubic symmetry of both phases with the unit cell parameter a = 0.4193(2) and 0.4204(3) nm, respectively. The absence of superstructural lines resulted in the conclusion on statistical arrangement of oxygen vacancies. Thermogravimetry and mass spectrometry proved that both phases can reversibly absorb water from gas phase (pH(2)O = 2 x 10(-2) atm) with observed correlation between the concentration of oxygen vacancies and amount of absorbed water. The total water amount was up to 0.9 mol per formula unit or, if recalculated for perovskite unit ABO(3), 0.3 and 0.23 mol H2O, respectively. The temperature curves of coductivity in the atmosphere with various partial water vapor pressures (pH(2)O = 3 x 10(-5) and 2 x 10(-2) atm) showed significantly higher conductivity and lower activation energy (0.52 eV) in humid atmosphere due to proton transfer. The proton conductivity is up to 5 x 10(-4) Ohm(-1) cm(-1) at 300 degrees C for Ba3In2ZrO8 specimen. IR spectrometry showed that pro-tons in the structure exist primarily in OH- groups.

Author keywords:

Ba3In2ZrO8; Ba4In2Zr2O11; oxygen vacancies; proton conductivity PROTON CONDUCTOR BA2IN2O5; WATER; OXIDES

DOI:

10.1134/S1023193510070037

Web of Science ID:

ISI:000282192000003

Соавторы в МНС:

Другие поля

Поле	Значение
Month	JUL
Publisher	MAIK NAUKA/INTERPERIODICA/SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013-1578 USA
Language	English
Keywords-Plus	PROTON CONDUCTOR BA2IN2O5; WATER; OXIDES
Research-Areas	Electrochemistry
Web-of-Science-Categories	Electrochemistry
Author-Email	irina.animitsa@usu.ru
Funding-Acknowledgement	Basic Foundation for Basic Research {[}07-08-00693]; Federal Science and Innovation Agency
Funding-Text	This work was supported by the Basic Foundation for Basic Research (project no. 07-08-00693) and by the Federal Science and Innovation Agency.
Number-of-Cited-References	25
Usage-Count-Last-180-days	3
Usage-Count-Since-2013	11
Journal-ISO	Russ. J. Electrochem.
Doc-Delivery-Number	654SZ