Title :
A.C. and D.C. characteristics of ZnO-Al2O3 composites
Author :
Choi, U-Sung ; Park, Choon-Bae ; Kim, Tae-Won ; Jung, Seungwoo ; Jeon, Jangbae
Author_Institution :
Dept. of Electron. Mater. Eng., Wonkwang Univ., Iksan, South Korea
Abstract :
Alternating current and direct current of pure, ball-milled, or Al 2O3 added ZnO are investigated by means of complex impedance measurement and a voltage-current source measurement unit. The electrical conductivity of ZnO-Al2O3 composite increases when the content of Al2O3 is within 1 at.% and decreases when it is more than that. The increase and decrease of electrical conductivity seem to be due to the donor effect of Al2O3 and the increase of the number of ZnO grains, respectively. The impedance spectrum seems to be semicircular. The sizes of semicircle increase with increasing Al2O3 content. The calculated dielectric constants (at 50°C) were about 70-140 at the peak of the semicircle
Keywords :
II-VI semiconductors; alumina; ceramics; dielectric materials; electric impedance; electrical conductivity; permittivity; powder technology; zinc compounds; 50 degC; AC characteristics; DC characteristics; ZnO-Al2O3; ball-milled materials; complex impedance measurement; dielectric constants; donor effect; electrical conductivity; impedance spectrum; voltage-current source measurement; Electrical resistance measurement; Geometrical optics; Impedance; Microstructure; Nonlinear optics; Optical waveguides; Photoconducting materials; Temperature dependence; USA Councils; Zinc oxide;
Conference_Titel :
Properties and Applications of Dielectric Materials, 1997., Proceedings of the 5th International Conference on
Conference_Location :
Seoul
Print_ISBN :
0-7803-2651-2
DOI :
10.1109/ICPADM.1997.616571
