AC Conductivity and Complex Impedance of 3-wt% Li2CO3-doped (Ba-0.5,Sr-0.5)TiO3 Thick Films on Ag-Pd Printed Alumina Substrates

作者：Ham Yong Su^*; Koh Jung Hyuk

来源：Journal of the Korean Physical Society, 2010, 57(4): 1024-1028.

DOI：10.3938/jkps.57.1024

• AC conductivity
• Impedance spectroscopy
• (Ba-0.5,Sr-0.5)TiO3
• Thick film

Three (3)-wt% Li2CO3 doped (Ba-0.5,Sr-0.5)TiO3 thick films were prepared and sintered at a relatively low temperature (900 degrees C) for electronic device applications. The thick films were prepared via a screen printing process on Ag-Pd printed alumina substrates. In this experiment, the crystalline and the electrical properties of Li2CO3-doped (Ba-0.5,Sr-0.5)TiO3 thick films on the Ag-Pd printed alumina substrates sintered at 900 degrees C were investigated. To investigate the electrical properties, we employed impedance spectroscopy and ac conductivity. In this study, we found that the 3-wt% Li2CO3 doped (Ba-0.5,Sr-0.5)TiO3 thick film exhibited perovskite and pseudo-cubic structures. Also, the relative dielectric permittivity of the 3 wt% Li2CO3 doped (Ba-0.5,Sr-0.5)TiO3 thick film was 149.25 at 30 degrees C, and the activation energies were 0.432 and 0.326 eV at 1 and 81.57 kHz, respectively. The resistances of the grain and the grain boundary were 17.65 k Omega and 40.5 k Omega at 130 degrees C, respectively.

• 出版日期2010-10