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Synthesis, spark plasma sintering and electrical conduction mechanism in BaTiO3-Cu composites |
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| Authors: | Songhak Yoon,Jü rgen DornseifferYan Xiong,Daniel Grü nerZhijian Shen,Shoichi Iwaya,Christian PithanRainer Waser |
| Affiliation: | a Institute for Solid State Research, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany b Institute for Chemistry and Dynamics of the Geosphere, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany c Arrhenius Laboratory, Stockholm University, SE-10691 Stockholm, Sweden d IOM Technology Corporation, 957-0231 Shibata-shi, Japan e Technical R&D Division, NAMICS Corporation, 108-0074 Tokyo, Japan |
| 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 μm 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 μm 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. |
| Keywords: | Spark plasma sintering Composites Electrical conductivity Densification |
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