AC conductivity and its scaling behavior in MgO-Li2O-B2O3-Bi2O3 glasses

作者：Purnima M; Bale Shashidhar; Samee M A; Ahmmad Shaik Kareem; Rahman Syed^*

来源：Journal of Physics and Chemistry of Solids, 2013, 74(2): 189-195.

DOI：10.1016/j.jpcs.2012.09.001

• Glasses
• Differential Scanning Calorimetry (DSC)
• Electrical conductivity
• Transport properties

In the present work, the compositional dependence of density, refractive index and glass transition temperature of xMgO-(25-x)Li2O-50B(2)O(3)-25Bi(2)O(3) glasses is studied. Impedance spectroscopy technique is employed on these samples and the data are analyzed using Cole-Cole type impedance response function. The AC conductivity behavior of the present glasses has been investigated in the frequency range from 100 Hz to 1 MHz and as a function of temperature the measured AC data are analyzed using the Jonscher's universal power law to explain the observed dispersive behavior of the electrical conductivity. The temperature and composition dependence scaling behavior in the AC conductivity are satisfactorily explained by scaling the AC conductivity sigma'(omega) by hopping frequency omega(p). The frequency response of dielectric constant epsilon' and dielectric loss tan delta as a function of temperature were studied. The tan delta peak shifts to higher frequency with increasing temperature, indicating dipolar relaxation character of dielectric loss in the present glasses.

• 出版日期2013-2