CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Oxygen ion conductivity of La0.8Sr0.2Ga0.83Mg0.17-xCoxO3-δ synthesized by laser rapid solidification |
Zhang Jie (张洁)a b, Yuan Chao (袁超)c, Wang Jun-Qiao (王俊俏)a, Liang Er-Jun (梁二军)a, Chao Ming-Ju (晁明举)a |
a School of Physical Science & Engineering and Key Laboratory of Materials Physics of Ministry of Education of China, Zhengzhou University, Zhengzhou 450052, China;
b Department of Physics and Electronic Science, Zhengzhou Normal University, Zhengzhou 450044, China;
c College of Science, Henan Agricultural University, Zhengzhou 450002, China |
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Abstract Materials La0.8Sr0.2Ga0.83Mg0.17-xCoxO3-δ with x=0, 0.05, 0.085, 0.10, and 0.15 are synthesized by laser rapid solidification. It is shown that the samples prepared by laser rapid solidification give rise to unique spear-like or leaf-like microstructures which are orderly arranged and densely packed. Their electrical properties each show a general dependence of the Co content and the total conductivities of La0.8Sr0.2Ga0.83Mg0.085Co0.085O3-δ prepared by laser rapid solidification are measured to be 0.067, 0.124, and 0.202 S·cm-1 at 600, 700, and 800 ℃, respectively, which are much higher than by conventional solid state reactions. Moreover, the electrical conductivities each as a function of the oxygen partial pressure are also measured. It is shown that the samples with the Co content values ≤ 8.5 mol% each exhibit basically ionic conduction while those for Co content values ≥ 10 mol % each show ionic mixed electronic conduction under oxygen partial pressures from 10-16 atm (1 atm=1.01325×105 Pa) to 0.98 atm. The improved ionic conductivity of La0.8Sr0.2Ga0.83Mg0.085Co0.085O3-δ prepared by laser rapid solidification compared with by solid state reactions is attributed to the unique microstructure of the sample generated during laser rapid solidification.
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Received: 01 November 2012
Revised: 15 January 2013
Accepted manuscript online:
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PACS:
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72.60.+g
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(Mixed conductivity and conductivity transitions)
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61.72.U-
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(Doping and impurity implantation)
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66.90.+r
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(Other topics in nonelectronic transport properties of condensed matter)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 10974183), the Fund for Science and Technology Innovation Team of Zhengzhou City, China (Grant No. 2011-3), and the Postdoctoral Research Sponsorship in Henan Province, China (Grant No. 2011002). |
Corresponding Authors:
Liang Er-Jun
E-mail: ejliang@zzu.edu.cn
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Cite this article:
Zhang Jie (张洁), Yuan Chao (袁超), Wang Jun-Qiao (王俊俏), Liang Er-Jun (梁二军), Chao Ming-Ju (晁明举) Oxygen ion conductivity of La0.8Sr0.2Ga0.83Mg0.17-xCoxO3-δ synthesized by laser rapid solidification 2013 Chin. Phys. B 22 087201
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