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  Electrical properties and structure of grain boundaries in n-conducting BaTiO3 ceramics

Hou, J., Zhang, Z., Preis, W., Sitte, W., & Dehm, G. (2011). Electrical properties and structure of grain boundaries in n-conducting BaTiO3 ceramics. Journal of the European Ceramic Society, 31(5), 763-771. doi:10.1016/j.jeurceramsoc.2010.11.016.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-4D34-7 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-4D35-5
Genre: Journal Article

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 Creators:
Hou, Junbo1, 2, Author              
Zhang, Zaoli2, Author              
Preis, Wolfgang1, Author              
Sitte, Werner1, Author              
Dehm, Gerhard2, 3, Author              
Affiliations:
1Chair of Physical Chemistry, University of Leoben, A-8700 Leoben, Austria, ou_persistent22              
2Erich Schmid Institute of Material Science, Austrian Academy of Sciences, Leoben, Austria, ou_persistent22              
3Department of Materials Physics, Montanuniversität Leoben, Austria, ou_persistent22              

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 Abstract: The electrical properties of positive temperature coefficient (PTC) 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.

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Language(s): eng - English
 Dates: 2011-05
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: -
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Title: Journal of the European Ceramic Society
  Abbreviation : J. Eur. Ceram. Soc.
Source Genre: Journal
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Publ. Info: Barking, Essex, England : Elsevier
Pages: - Volume / Issue: 31 (5) Sequence Number: - Start / End Page: 763 - 771 Identifier: ISSN: 0955-2219
CoNE: https://pure.mpg.de/cone/journals/resource/958480280160