TY  - JOUR
AU  - Yoon, S.
AU  - Dornseiffer, J.
AU  - Xiong, Y.
AU  - Grüner, D.
AU  - Shen, Z.
AU  - Iwaya, S.
AU  - Pithan, C.
AU  - Waser, R.
TI  - Synthesis, spark plasma sintering and electrical conduction mechanism in BaTi3-Cu composites
JO  - Journal of the European Ceramic Society
VL  - 31
SN  - 0955-2219
CY  - Amsterdam [u.a.]
PB  - Elsevier Science
M1  - PreJuSER-16900
SP  - 773 - 782
PY  - 2011
N1  - 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.
AB  - 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.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000287389300014
DO  - DOI:10.1016/j.jeurceramsoc.2010.11.012
UR  - https://juser.fz-juelich.de/record/16900
ER  -