Strontium tantalates with perovskite-related structure / Animitsa I,Neiman A,Sharafutdinov A,Nochrin S // SOLID STATE IONICS. - 2000. - V. 136, l. SI. - P. 265-271.

ISSN/EISSN:

0167-2738 / нет данных

Type:

Article; Proceedings Paper

Abstract:

The perovskite-related solid solution Sr6-2xTa2+2xO11+3x with oxygen structural vacancies has been studied by ac-conductivity measurements and thermogravimetry experiments in atmospheres of various water activities. It is found char Sr6-2xTa2+2xO11+3x with high oxygen vacancy concentrations is a high-temperature mixed oxygen-hydrogen ion conductor the conductivity of which is very sensitive to the presence of water vapour up to 900 degreesC. The TG study indicates that overall water weight loss increased with increasing the concentration of oxygen vacancies, but this relationship is not linear. The deviation of observed water uptake from theoretical value is relatively low only for Sr6Ta2O11. In accordance with the observed two-stage water removal the corresponding mechanism of the dehydration process has been proposed, involving deliberation of water molecules coordinated to metal atoms during the first stage followed by OH groups leaving the framework at the second. The possibility of the formation of oxyhydrate, intercalate or intergrown phases was discussed. (C) 2000 Elsevier Science B.V. All rights reserved.

Author keywords:

perovskites; protonic conductor; water uptake PROTONS

DOI:

10.1016/S0167-2738(00)00320-9

Web of Science ID:

ISI:000165996600038

Соавторы в МНС:

Другие поля

Поле	Значение
Month	NOV
Note	12th International Conference on Solid State Ionics, HALKIDIKI, GREECE, JUN 06-12, 1999
Organization	Minist Cultural Affairs; Minist Educ; Minist Macedonia \& Thrace; Gen Secretariat Res \& Technol; Univ Patras, Res Comm; Aristotle Univ Thessaloniki; Univ Thessaly; Patras Sci Pk; Chem Process Engn Res Inst; Natl Bank Greece; Commercial Bank Greece; Agr Bank Greece; Athenian Brewry SA, Patras Plant; LPC Hellas; Leader Books SA; GlaxoWellcome; George P Vasilopoulos SA; Hlthcon Ltd; Energizer; ONR; Elefctrochem Soc, High Temperature Mat Div
Publisher	ELSEVIER SCIENCE BV
Address	PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language	English
Keywords-Plus	PROTONS
Research-Areas	Chemistry; Physics
Web-of-Science-Categories	Chemistry, Physical; Physics, Condensed Matter
Number-of-Cited-References	11
Usage-Count-Since-2013	5
Journal-ISO	Solid State Ion.
Doc-Delivery-Number	385GZ