Synthesis and transport properties of perovskite-like phases (Sr, Ba)(4)E2Nb2O11 (+/-) (delta) (E = Mn, Cr, Cu) / Animitsa I. E.,Kochetova N. A.,Nokhrin S. S.,Dogodaeva E. N. // RUSSIAN JOURNAL OF ELECTROCHEMISTRY. - 2007. - V. 43, l. 6. - P. 699-707.

ISSN/EISSN:

1023-1935 / нет данных

Type:

Article

Abstract:

Synthesis of (Sr, Ba)(4)Theta 2Nb2O11 (+/- delta) where E = Mn, Cr, Cu and solid solution (Sr1 - yCuy)(6 - 2x)Nb2 + 2xO11 + 3x is performed. By measuring the overall conductance of some solid-solution compositions it is established that the conductance increases with the cubic-lattice parameter and concentration of oxygen vacancies. Values of the conductance in humid air at T < 700 degrees C are shown to increase as compared with dry air. Mass spectrometry analysis confirms the possibility of water incorporation into the complex-oxide structure out of a gas phase. Complex certification of samples of the composition (Sr, Ba)(4)E2Nb2O11 where E = Mn, Cr, Cu is performed. It is established that the decrease in the overall electroconductance occurs in the series Sr4Mn2Nb2O11 > Ba4Mn2Nb2O11 > Sr4CrMnNb2O11 > Sr4Cu2Nb2O11. Investigation of the overall electroconductance in dry and moist atmospheres shows that the effect of humidity exerts no influence on the values of the overall electroconductance. The oxygen-ion constituent of conductance is determined by the Arzhannikov method and is also evaluated from a sigma,pO(2) dependence. It is established that the presence of an element with a variable oxidation degree for compositions of the type Sr4E2Nb2O11 leads to an increase in the contribution made by the electronic constituent. In so doing, the magnitude of the oxygen-ion conductance practically does not alter. Thermal and mass spectrometry analyses show that, for the Sr4E2Nb2O11 compositions where E = Mn, Cr, Cu, there occurs no water intercalation into structure, correspondingly, there is observed no appearance of a protonic constituent of conduction.

Author keywords:

niobates and tantalates of alkaline-earth metals; synthesis; electroconduction; water intercalation; Arzhannikov method SYSTEM; WATER

DOI:

10.1134/S1023193507060134

Web of Science ID:

ISI:000247977600013

Соавторы в МНС:

Другие поля

Поле	Значение
Month	JUN
Publisher	MAIK NAUKA/INTERPERIODICA/SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013-1578 USA
Language	English
Keywords-Plus	SYSTEM; WATER
Research-Areas	Electrochemistry
Web-of-Science-Categories	Electrochemistry
Author-Email	irina.animitsa@usu.ru
Number-of-Cited-References	12
Usage-Count-Last-180-days	3
Usage-Count-Since-2013	7
Journal-ISO	Russ. J. Electrochem.
Doc-Delivery-Number	189GO