Synthesis, spark plasma sintering and electrical conduction mechanism in BaTiO(3)-Cu composites
2011 (English)In: Journal of the European Ceramic Society, ISSN 0955-2219, Vol. 31, no 5, 773-782 p.Article in journal (Refereed) Published
BaTiO(3)-Cu composite powders were prepared via an alkoxide-mediated synthesis approach. As-synthesized BaTiO(3) 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. BaTiO(3)-Cu composites were successfully densified by spark plasma sintering (SPS). The microstructures show an average grain-size for BaTiO(3) of around 100 nm and a crystallite size of about 1 mu m for the Cu inclusions. The AC conductivity of the BaTiO(3)-Cu composites increased with increasing Cu content or with temperature. The dominant electrical conduction mechanism in SPSed BaTiO(3)-Cu composites changed from migration of oxygen vacancies to band conduction of trapped electrons in oxygen vacancies with the increase of Cu content.
Place, publisher, year, edition, pages
2011. Vol. 31, no 5, 773-782 p.
Spark plasma sintering, Composites, Electrical conductivity, Densification
IdentifiersURN: urn:nbn:se:su:diva-68542DOI: 10.1016/j.jeurceramsoc.2010.11.012ISI: 000287389300014OAI: oai:DiVA.org:su-68542DiVA: diva2:472736
authorCount :82012-01-042012-01-042012-01-04Bibliographically approved