20-22 May 2015
Asia/Bangkok timezone
The Centennial Celebration of General Relativity Theory and 80 Years of Thai Physics Graduate

Influences of Sn Doping and CaTiO${}_3$ Volume Fraction on Microstructure and Electrical Response of Sn-doped CaCu${}_3$Ti${}_4$O${}_{12}$/CaTiO${}_3$ Composites

21 May 2015, 13:00
3h 30m
Board: MNA-16
Poster presentation Material Physics, Nanoscale Physics and Nanotechnology Poster-3

Speaker

Mr Jutapol Jumpatam (Materials Science and Nanotechnology Program, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002)

Description

The influences of Sn doping concentration and CaTiO$_3$ volume fraction on microstructure and electrical response of Sn-doped CaCu$_3$Ti$_4$O$_{12}$/CaTiO$_3$ composites prepared from a nominal formula of Ca$_{1+x}$Cu$_{3-x}$Ti$_{4-y}$Sn${}_y$O${}_{12}$ (where $x$ = 0, 0.5, 1 and 1.5; $y$ = 0.05 and 0.30) were investigated. The dielectric properties of CaCu${}_3$Ti${}_4$O${}_{12}$/CaTiO${}_3 $ composites were measured as functions of frequency and temperature. The n-type semiconducting grains of CaCu${}_3$Ti${}_4$O${}_{12}$ phase and insulating interfaces between CaCu${}_3$Ti${}_4$O${}_{12}$-CaCu${}_3$Ti${}_4$O${}_{12}$ grains and CaCu${}_3$Ti${}_4$O${}_{12}$-CaTiO${}_3$ grains were studied by an impedance spectroscopy technique. The microstructure of Ca${}_{1+x}$Cu${}_{3-x}$Ti${}_{4-y}$Sn${}_y$O${}_{12}$ ceramics was slightly changed with increasing CaTiO${}_3$ volume fraction. The dielectric properties were strongly affected by Sn content and the volume faction of CaTiO${}_3$. At 1 kHz, the dielectric constant (${\varepsilon}^{\prime}$) increased with increasing Sn doping concentration. It was also found that ${\varepsilon}^{\prime}$ decreased with increasing CaTiO${}_3$ volume fraction. The activation energy for conduction within the grains slightly increased with increasing the Sn content; whereas, the activation energy for conduction at the internal interfaces decreased slightly. Interestingly, it was found that Egb increased significantly with increasing CaTiO${}_3$ volume fraction.

Primary author

Mr Jutapol Jumpatam (Materials Science and Nanotechnology Program, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002)

Co-authors

Dr Prasit Thongbai (Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002) Prof. Santi Maensiri (School of Physics, Institute of Science, Suranaree University of Technology, Nakorn Ratchasima, THAILAND 30000) Dr Teerapon Yamwong (National Metal and Materials Technology Center (MTEC), Thailand Science Park, Pathumthani, THAILAND 12120)

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