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

Effect of Annealing in Reducing Atmosphere on Dielectric Properties of CaCu${}_3$Ti${}_4$O${}_{12}$/CaTiO${}_3$ Composites

21 May 2015, 13:00
3h 30m
Board: MNA-42
Poster presentation Material Physics, Nanoscale Physics and Nanotechnology Poster-3

Speaker

Ms Theeranuch Nachaithong (Materials Science and Nanotechnology Program, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002)

Description

The influence of annealing in Ar on the dielectric properties of CaCu${}_3$Ti${}_4$O${}_{12}$/CaTiO${}_3$ (CCTO/CTO) composites prepared by a solid state reaction method was studied. The phase composition and the microstructure were characterized by X-ray diffraction and scanning electron microscope with energy dispersive X-ray spectrometry, respectively. High dielectric permittivity values (2300$-$3000) with low loss tangent (0.01$-$0.03) at 1 kHz and room temperature were achieved in the CCTO/CTO composites. The dielectric permittivity was nearly independent on frequency in the range of 100$-$100000 Hz. Interestingly, the dielectric permittivity of the CCTO/CTO composites was largely reduced by annealing the sample in Ar atmosphere; while the low-frequency loss tangent value was largely increased. These results indicated to the decrease in the total resistance of the internal interfaces, i.e., CCTO-CCTO and CCTO-CTO interfaces. The dielectric behavior of the CCTO/CTO composites can be well explained based on the Maxwell-Wagner polarization at the internal interfaces.

Primary author

Ms Theeranuch Nachaithong (Materials Science and Nanotechnology Program, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002)

Co-author

Dr Prasit Thongbai (Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002)

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