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

doi:10.1088/1674-1056/22/8/087201

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 La_0.8Sr_0.2Ga_0.83Mg_0.17-xCo_xO_3-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

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 La_0.8Sr_0.2Ga_0.83Mg_0.17-xCo_xO_3-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

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/Abstract

摘要： Materials La_0.8Sr_0.2Ga_0.83Mg_0.17-xCo_xO_3-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 La_0.8Sr_0.2Ga_0.83Mg_0.085Co_0.085O_3-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 La_0.8Sr_0.2Ga_0.83Mg_0.085Co_0.085O_3-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 La_0.8Sr_0.2Ga_0.83Mg_0.17-xCo_xO_3-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 La_0.8Sr_0.2Ga_0.83Mg_0.085Co_0.085O_3-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 La_0.8Sr_0.2Ga_0.83Mg_0.085Co_0.085O_3-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)

张洁, 袁超, 王俊俏, 梁二军, 晁明举. Oxygen ion conductivity of La_0.8Sr_0.2Ga_0.83Mg_0.17-xCo_xO_3-δ synthesized by laser rapid solidification[J]. 中国物理B, 2013, 22(8): 87201-087201.

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 La_0.8Sr_0.2Ga_0.83Mg_0.17-xCo_xO_3-δ synthesized by laser rapid solidification[J]. Chin. Phys. B, 2013, 22(8): 87201-087201.

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Oxygen ion conductivity of La_0.8Sr_0.2Ga_0.83Mg_0.17-xCo_xO_3-δ synthesized by laser rapid solidification

Oxygen ion conductivity of La_0.8Sr_0.2Ga_0.83Mg_0.17-xCo_xO_3-δ synthesized by laser rapid solidification

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