High-temperature proton conductors with structure-disordered oxygen sublattice / Animitsa I. E. // RUSSIAN JOURNAL OF ELECTROCHEMISTRY. - 2009. - V. 45, l. 6. - P. 668-676.

ISSN/EISSN:

1023-1935 / нет данных

Type:

Article; Proceedings Paper

Abstract:

Data on the thermogravimetry, spectroscopy, and electrical charge transfer as functions of T, aH(2)O, and aO(2) for niobates and tantalates of alkali-earth metals with structure disordering of the oxygen sublattice, which can show high-temperature proton conduction, are summarized. It is shown that in the solid solution series with decreasing x (that is, with the increasing of the oxygen vacancies concentration) the proton conductivity increase, which is caused by the increasing of both the concentration of proton defects formed in the structure (in compliance with the formula Sr6 - 2x M (2 + 2x) (+5) O-10(OH)(2-6x) and their mobility. The proton transfer dominates for the compositions with x < 0.15 at temperatures below 550A degrees C. In the solid solutions (Ba1-y Ca (y) )(6)Nb2O11 (0.23 a parts per thousand currency sign y a parts per thousand currency sign 0.47) characterized by equal concentration of oxygen vacancies, with the increasing of barium content (correspondingly, with the increasing of the lattice parameter) the oxygen-ion conductivity (at aH(2)O = 3 x 10(-5)) grows monotonically, which is caused by the decreasing of the oxygen atom migration energy and increasing of their mobility. In this series, the proton conductivity (at aH(2)O = 2 x 10(-2)) increased. It was shown, by using IR-spectroscopy and the H-1 NMR method, that the protons exist in the complex oxide structure mainly as energy-wise nonequivalent OH- groups: isolated, closely set, and paired, whose quantitative ratios are determined by the coordination preference of the B-sublattice elements.

Author keywords:

perovskites; niobates; tantalates; high-temperature proton conduction PEROVSKITE-RELATED STRUCTURE; WATER; SR6TA2O11

DOI:

10.1134/S1023193509060081

Web of Science ID:

ISI:000267670800008

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	JUN
Note	9th Conference on Fundamental Problems of Solid-State Ionics, Chernogolovka, RUSSIA, JUN 24-27, 2008
Publisher	MAIK NAUKA/INTERPERIODICA/SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013-1578 USA
Language	English
Keywords-Plus	PEROVSKITE-RELATED STRUCTURE; WATER; SR6TA2O11
Research-Areas	Electrochemistry
Web-of-Science-Categories	Electrochemistry
Author-Email	Irina.Animitsa@usu.ru
Number-of-Cited-References	18
Usage-Count-Since-2013	5
Journal-ISO	Russ. J. Electrochem.
Doc-Delivery-Number	466OF