Speaker
Mr
Pariwat Saengvong
(Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002)
Description
The dielectric properties and electrical response of grain boundaries of Na${}_{1/3}$Ca${}_{1/3}$La${}_{1/3}$Cu${}_3$Ti${}_4$O${}_{12}$ ceramics were investigated as a function of frequency. High dielectric permittivity (${\varepsilon}^{\prime}\sim$10${}^4$) and low loss tangent (tan$\delta$<0.1 at 1 kHz) were observed in Na${}_{1/3}$Ca${}_{1/3}$La${}_{1/3}$Cu${}_3$Ti${}_4$O${}_{12}$ ceramics. Through analyses using a complex impedance spectroscopy, it was found that the dielectric properties of Na${}_{1/3}$Ca${}_{1/3}$La${}_{1/3}$Cu${}_3$Ti${}_4$O${}_{12}$ ceramics were closely related to the electrical response of grain boundaries. The investigation of electrical response of the grain boundary suggested that the potential barrier at the grain boundaries of Na${}_{1/3}$Ca${}_{1/3}$La${}_{1/3}$Cu${}_3$Ti${}_4$O${}_{12}$ ceramics was due to the Schottky effect. The giant low frequency dielectric response in Na${}_{1/3}$Ca${}_{1/3}$La${}_{1/3}$Cu${}_3$Ti${}_4$O${}_{12}$ ceramics is attributed to Maxwell-Wagner polarization at the grain boundaries.
Author
Mr
Pariwat Saengvong
(Department of Physics, 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)
