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Dielectric Relaxation in Li$_2$O-0.5B$_2$O$_3$-0.5SiO$_2$ Glass: Electrical Conductivity, Impedance and Modulus Analyses
New Physics: Sae Mulli 2017; 67: 17~23
Published online January 31, 2017;
© 2017 New Physics: Sae Mulli.

Mac KIM1, Hui Je RYU2, Yong Suk YANG2*

1 Department of Nano Fusion Technology, Pusan National University, Busan 46241, Korea
2 Department of Nanoenergy Engineering, Pusan National University, Busan 46241, Korea
Correspondence to:
Received June 29, 2016; Revised August 11, 2016; Accepted November 5, 2016.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
We investigated the dielectric relaxation properties of Li$_2$O-0.5B$_2$O$_3$-0.5SiO$_2$ (LBSO) glass, which is used as a thin-film Li-ion battery electrolyte. The glass sample was synthesized by using the melt quenching method, and the electrical properties were measured in the frequency and temperature ranges of 100 Hz $\sim$ 30 MHz and 30 $\sim$ 700 $^\circ$C at a heating rate of 2 $^\circ$C/min, respectively. The ionic conductivity and the dielectric relaxation of the LBSO glass were analyzed by employing its electrical conductivity, complex impedance and modulus. The $dc$ and the $ac$ activation energies obtained using Jonscher’s universal power law were 0.56 and 0.56 eV, and those obtained using Cole-Cole plot were 0.55 and 0.53 eV, respectively. The similar values of the $dc$ and the $ac$ activation energies indicate that the potential barrier heights between long and short distances for the ions to move are close to each other. The frequency dependency of the modulus could be fitted using the Kohlrausch-Williams-Watts model, and the results were compared with those obtained from an electrical impedance and conductivity analysis.  
PACS numbers: 72.80.Ng, 77.22.Gm, 72.20.Ee
Keywords: Li$_2$O-B$_2$O$_3$-SiO$_2$ glass, Dielectric relaxation, Universal power law, Cole-Cole plot, Electrical modulus

August 2017, 67 (8)