Strontium tantalates with a perovskite structure: Their conductivity and high-temperature interaction with water / Animitsa IE,Neiman AY,Sharafutdinov AR,Kazakova MG // RUSSIAN JOURNAL OF ELECTROCHEMISTRY. - 2001. - V. 37, l. 3. - P. 266-272.

ISSN/EISSN:

1023-1935 / нет данных

Type:

Article

Abstract:

The interaction of perovskite-like solid solutions Sr6-2xTa2+2xO11+3x (x = 0-0.28) with water is studied, along with dependences of the solutions' conductivity on their composition and the atmosphere's temperature and humidity. The Sr6-2xTa2+2xO11+3x phases with high concentrations of structural oxygen vacancies are high-temperature mixed oxygen-hydrogen ionic conductors whose conduction is sensitive to the presence of water vapor up to 900 degreesC. According to a thermogravimetric study, the amount of water incorporated into the complex-oxide matrix is proportional to the concentration of structural oxygen vacancies. The process of water incorporation is considered in terms of crystalline and chemical properties of the structure. The oxygen-deficient perovskites containing coordination-unsaturated metal atoms can reconstruct their coordination polyhedron by adding water molecules, with subsequent partial dissociation of water to hydroxyl groups. The proposed mechanism explains different states of water in the oxide and a two-stage nature of its removal: water molecules coordinating the metal atom and those surrounding OH- leave the core in the first and second stages, respectively.

Author keywords:

TRANSPORT; PROTONS; OXIDES

DOI:

10.1023/A:1009025313816

Web of Science ID:

ISI:000168693600007

Соавторы в МНС:

Другие поля

Поле	Значение
Month	MAR
Publisher	MAIK NAUKA/INTERPERIODICA
Address	C/O KLUWER ACADEMIC-PLENUM PUBLISHERS, 233 SPRING ST, NEW YORK, NY 10013-1578 USA
Language	English
Keywords-Plus	TRANSPORT; PROTONS; OXIDES
Research-Areas	Electrochemistry
Web-of-Science-Categories	Electrochemistry
Number-of-Cited-References	25
Journal-ISO	Russ. J. Electrochem.
Doc-Delivery-Number	432LQ