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
张洁a b, 袁超c, 王俊俏a, 梁二军a, 晁明举a
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
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.
中图分类号: (Mixed conductivity and conductivity transitions)