Journal
MATERIALS LETTERS
Volume 65, Issue 17-18, Pages 2624-2627Publisher
ELSEVIER
DOI: 10.1016/j.matlet.2011.05.109
Keywords
Mixed ionic-electronic conductor; SrTiO3-based ceramics; A-site deficiency; Electrical properties; Sintering
Funding
- National Nature Science Foundation of China [50672009, 20973021]
- Outstanding Doctoral Dissertation Guidance Foundation of Beijing [YB20091000802]
- US Department of Defense [W91CRB-10-1-0007]
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Mixed ionic-electronic conductors with high ionic conductivity play an important role in modern solid-state ionic devices. The ionic conductivity of SrTiO3-based materials can be significantly improved by creating deficiency on the A-site and acceptor-doping on the B-site. We report in this paper a remarkable enhancement of ionic conductivity, sinterability and thermal stability of (La, Sc) co-doped SrTiO3 by creating deficiency on the A-site. The ionic conductivity of (La0.3Sr0.7)(0.95)Sc(0.10)Ti(0.9)0O(3-delta) varies from 0.005 S/cm at 500 degrees C to 0.01 S/cm at 700 degrees C and to 0.018 S/cm at 950 degrees C in 5%H-2/Ar. These values are nearly eight times higher than that of La0.3Sr0.7TiO3-delta at T >= 700 degrees C. The A-site deficiency in (La, Sc) co-doped SrTiO3 also improves the thermal and electrical stabilities in various atmospheres. A possible charge compensation mechanism among defects in the (La0.3Sr0.7)(0.95)Sc0.10Ti0.90O3-delta is also discussed. (C) 2011 Elsevier B.V. All rights reserved.
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