03.05.2011
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 03.05.2011   Карта сайта     Language По-русски По-английски
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03.05.2011










doi:10.1016/j.ssi.2011.03.001 | How to Cite or Link Using DOI
Copyright © 2011 Elsevier B.V. All rights reserved.
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Electrical conduction in (La0.97Sr0.03)2(Mo1 − xGax)2O9 − α ceramics


Jianhong Xua, Jinling Yina, Xiaowen Wanga, Hongtao Wanga and Guilin Malow asterisk, a, E-mail The Corresponding Author





a Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China




Received 26 October 2010;


revised 11 January 2011;


accepted 1 March 2011.


Available online 22 March 2011.











Abstract



A novel series of ceramic samples (La0.97Sr0.03)2(Mo1 − xGax)2O9 − α (x = 0, 0.01, 0.03, 0.05, 0.08) were prepared by a solid-state reaction method. All the doubly doped ceramics have a single cubic structure except (La0.97Sr0.03)2(Mo0.92Ga0.08)2O9 − α. The conduction behaviors of the samples with x ≤ 0.05 were investigated using various electrochemical methods including gas concentration cells, oxygen electrochemical permeation and AC impedance spectroscopy in the temperature range of 823–1273 K. In dry oxygen-containing atmosphere, the ceramic samples were almost pure oxide-ionic conductors. In wet oxygen-containing atmosphere, the ceramic samples were also almost pure oxide-ionic conductors, but didn't possess the protonic conduction. The electrochemical oxygen permeation experiment further verified the oxide-ionic conduction nature under oxygen-containing atmosphere. The phase transition has been completely suppressed in the doubly doped samples in both dry and wet air atmospheres. The oxide-ionic conductivities were affected by the doping levels, and increased in the order: σ (x = 0.05) < σ (x = 0) < σ (x = 0.03) < σ (x = 0.01). (La0.97Sr0.03)2(Mo0.99Ga0.01)2O9 − α exhibited the highest oxide-ionic conductivity of 0.103 S cm−1 at 1273 K.











Research highlights



► A novel series of (La0.97Sr0.03)2(Mo1 − xGax)2O9 − α were prepared. ► The solubility limit of Ga in (La0.97Sr0.03)2(Mo1 − xGax)2O9 − α was at least x = 0.05. ► The samples were almost pure oxide-ionic conductors in oxygen-containing atmospheres. ► The phase transition has been completely suppressed in the doubly doped samples. ► The conductivities increased in the order: σ(x = 0.05) < σ(x = 0) < σ(x = 0.03) < σ(x = 0.01).





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  • Chen Wev   honorary member of ISSC science council

  • Harton Vladislav Vadim  honorary member of ISSC science council

  • Lichtenstain Alexandr Iosif  honorary member of ISSC science council

  • Novikov Dimirtii Leonid  honorary member of ISSC science council

  • Yakushev Mikhail Vasilii  honorary member of ISSC science council

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