The effect of F--doping on the conductivity of proton conductor Ba4Ca2Nb2O11 / Belova K.,Baskakova S.,Argirusis Chr.,Animitsa I. // ELECTROCHIMICA ACTA. - 2016. - V. 193, l. . - P. 63-71.

ISSN/EISSN:

0013-4686 / 1873-3859

Type:

Article

Abstract:

The fluorine-doped solid solution with double perovskite structure Ba4Ca2Nb2O11-0.5xFx was synthesized using the solid state method. It was found that the homogeneity region was limited by the composition Ba4Ca2Nb2O10.6F0.8. Structure and electrical properties of the solid solution have been investigated. Electrical conductivities were measured by varying the temperature in dry (pH(2)O = 1.9 10(-4) atm) and wet (pH2O = 1.42 10(-2) atm) air. These phases are capable of dissociative dissolution of water vapour and water uptake decreases with increasing x as a result of decreasing the concentration of oxygen vacancies. Fluorine doping increases the conductivity of Ba4Ca2Nb2O11 proton conductor over the investigated temperature range of 200-1000 degrees C, and a maximum of conductivity is observed for the fluorine content of x = 0.3 - 0.6. The difference between un- and fluorine-doped samples is more than 0.5 order of magnitude. The effect of F--doping on ionic conductivities of double perovskite Ba4Ca2Nb2O11 deals with an increase in mobility of oxygen (dry air) and protons (wet air), the increase in the mobility (consequently, conductivity) is accompanied by decrease in activation enthalpy. (C) 2016 Elsevier Ltd. All rights reserved.

Author keywords:

double perovskite; niobate; fluorine doping; proton conductor SHORT-RANGE STRUCTURE; ELECTRIC PROPERTIES; CHEMICAL-STABILITY; FUEL-CELLS; PEROVSKITE; BA2IN2O5; TEMPERATURE; OXIDES; ELECTROLYTE; BACEO3

DOI:

10.1016/j.electacta.2016.02.05

Web of Science ID:

ISI:000371471900009

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	MAR 1
Publisher	PERGAMON-ELSEVIER SCIENCE LTD
Address	THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
Language	English
EISSN	1873-3859
Keywords-Plus	SHORT-RANGE STRUCTURE; ELECTRIC PROPERTIES; CHEMICAL-STABILITY; FUEL-CELLS; PEROVSKITE; BA2IN2O5; TEMPERATURE; OXIDES; ELECTROLYTE; BACEO3
Research-Areas	Electrochemistry
Web-of-Science-Categories	Electrochemistry
Author-Email	Ksenia.Belova@urfu.ru
ResearcherID-Numbers	Baskakova, Svetlana/Q-6803-2016
Funding-Acknowledgement	Grant of fundamental and exploratory research in cooperation of Ural Federal University; Ural Branch of the Russian Academy of Sciences
Funding-Text	This work was financially supported by the Grant of fundamental and exploratory research in cooperation of Ural Federal University and Ural Branch of the Russian Academy of Sciences.
Number-of-Cited-References	36
Usage-Count-Last-180-days	3
Usage-Count-Since-2013	21
Journal-ISO	Electrochim. Acta
Doc-Delivery-Number	DF6NG