中国物理B ›› 2013, Vol. 22 ›› Issue (8): 87201-087201.doi: 10.1088/1674-1056/22/8/087201

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Oxygen ion conductivity of La0.8Sr0.2Ga0.83Mg0.17-xCoxO3-δ synthesized by laser rapid solidification

张洁a b, 袁超c, 王俊俏a, 梁二军a, 晁明举a   

  1. 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
  • 收稿日期:2012-11-01 修回日期:2013-01-15 出版日期:2013-06-27 发布日期:2013-06-27
  • 基金资助:
    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).

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   

  1. 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
  • Received:2012-11-01 Revised:2013-01-15 Online:2013-06-27 Published:2013-06-27
  • Contact: Liang Er-Jun E-mail:ejliang@zzu.edu.cn
  • Supported by:
    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).

摘要: 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.

关键词: doped lanthanum gallate, laser rapid solidification, oxygen ion conductivity, activation energy

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.

Key words: doped lanthanum gallate, laser rapid solidification, oxygen ion conductivity, activation energy

中图分类号:  (Mixed conductivity and conductivity transitions)

  • 72.60.+g
61.72.U- (Doping and impurity implantation) 66.90.+r (Other topics in nonelectronic transport properties of condensed matter)