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Effect of Annealing Temperature on the Li
+
^{ + }
+
Ionic Conductivity of La
0.67
−
x
_{0.67 - x}
0.67
−
x
Li
3
x
_{3x}
3
x
TiO
3
_{3 }
3
Authors
Nguyen Nang Dinh
Pham Duy Long
Le Dinh Trong
Publication date
31 December 2009
Publisher
'Publishing House for Science and Technology, Vietnam Academy of Science and Technology'
Abstract
Perovskite La0.67-xLi3xTiO3 with x = 0.10, 0.11, 0.12 and 0.13 were firstly annealed at 800 oC then treated by reactive milling, followed by post-annealing at temperatures from 1100 to 1200oC. The crystalline structure of grain and grain-boundary were characterized by XRD and SEM. The impedance measurements showed that nanocrystalline La0.67-xLi3xTiO3 after being annealed at 1150 oC possessed a grain conductivity as high as 1.3×10-3 S.cm-1. The grain-boundary conductivity was enhanced one order in magnitude after annealing at temperature higher 1100oC and consists of 5.8×10-5 S.cm-1. The results have also showed the limitation of the adiabatic thermal treatment for the improvement of the grain-boundary conductivity and suggested the way to overcome the limitation by rapidly cooling the samples from the high temperature to room temperature
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Last time updated on 17/10/2019