Journal Article

PreJuSER-16900

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Synthesis, spark plasma sintering and electrical conduction mechanism in BaTi3-Cu composites

Yoon, S.FZJ* ; Dornseiffer, J.FZJ* ; Xiong, Y. ; Grüner, D.FZJ* ; Shen, Z. ; Iwaya, S. ; Pithan, C.FZJ* ; Waser, R.FZJ*

2011
Elsevier Science Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.jeurceramsoc.2010.11.012

Abstract: BaTiO3-Cu composite powders were prepared via an alkoxide-mediated synthesis approach. As-synthesized BaTiO3 nanoparticles were as small as 40 nm and coated partially larger Cu particles of approximately 1 mu m in size. Thermogravimetric analysis (TGA) and dilatometry revealed a gradual increase in weight loss and retarded shrinkage with the increase of Cu addition. BaTiO3-Cu composites were successfully densified by spark plasma sintering (SPS). The microstructures show an average grain-size for BaTiO3 of around 100 nm and a crystallite size of about 1 mu m for the Cu inclusions. The AC conductivity of the BaTiO3-Cu composites increased with increasing Cu content or with temperature. The dominant electrical conduction mechanism in SPSed BaTiO3-Cu composites changed from migration of oxygen vacancies to band conduction of trapped electrons in oxygen vacancies with the increase of Cu content. (c) 2010 Elsevier Ltd. All rights reserved.

Keyword(s): J ; Spark plasma sintering (auto) ; Composites (auto) ; Electrical conductivity (auto) ; Densification (auto)

Note: This work was supported by the Korea Research Foundation Grant funded by the Korean Government (KRF-2007-D00124). S. Yoon acknowledges support from COST Action 539 (COST-STSM-539-03589) of the European Union. NAMICS Corporation, Niigata (Japan) is gratefully acknowledged for financial support within a common collaboration project. The authors are grateful to Dr. Heinz-Josef Penkalla for the element specific analysis by TEM and to Dr. Detlev Hennings for helpful discussion and comments.

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Contributing Institute(s):

1. Troposphäre (IEK-8)
2. Elektronische Materialien (PGI-7)
3. Jülich-Aachen Research Alliance - Fundamentals of Future Information Technology (JARA-FIT)

Research Program(s):

1. Atmosphäre und Klima (P23)
2. Grundlagen für zukünftige Informationstechnologien (P42)

Appears in the scientific report 2011

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