# Siam Physics Congress 2015

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

### 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)

### Presentation Materials

There are no materials yet.