Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 31, Issue 5, Pages 763-771Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2010.11.016
Keywords
BaTiO3 and titanates; Electrical properties; Grain boundaries; Interfaces; HRTEM
Categories
Funding
- Austrian Federal Government
- Styrian Provincial Government
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The electrical properties of positive temperature coefficient (FTC) ceramics are expected to strongly correlate with the potential barrier height at grain boundaries, which in turn may be influenced by the grain boundary structure and chemistry. In this study, n-conducting BaTiO3 ceramics co-doped by La and Mn were prepared, and the electrical properties were determined by impedance spectroscopy and dc four-point van der Pauw measurements. Detailed analysis of the grain boundary structure was performed by electron microscopy techniques across different length scales. The study revealed that the randomly oriented polycrystalline microstructure was dominated by large angle grain boundaries, which in the present case were dry although a secondary crystalline and glass phase formed at triple junctions. The relationship between the observed grain boundary atomic structures and electrical properties is briefly discussed. (c) 2010 Elsevier Ltd. All rights reserved.
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