Ionic transports and optical spectra of 50Li2O–50B2O3 glass

Abstract The ionic and optical transports of 50Li2O–50B2O3 glass were investigated. Time-resolved current spectra (TRCS) showed repetitions of typical charge and discharge processes. The model circuit and equation for the TRCS and the equation for the relation between the turning times of polarization (TTP) and configuration energy (CE) have also been suggested. Equations were satisfied by the experimental results, and the potential and temperature dependence of the configuration energy (CE) and the dipole length from the TTP were investigated in detail. Kink phenomena showed that three or more types of charges were involved in the polarizations. The bi-exponential conductivity equation was applied to obtain the temperature dependence of the ac conductivity (TDAC). Complex impedance spectra (CIS) consisted of a semi-arc and a spur due to the electrode-specimen polarization. The shift of inflection points and peak frequencies in complex modulus spectra (CMS) showed non-Debye type relaxations, and the activation energy for relaxation was consistent with the relaxation for the temperature dependence of the dc conductivity (TDC). The migration concept (MC) applied to the CMS was satisfied at the dispersion and peak region, but slightly swerved at the tail. The fractal dimensionality displayed a three-dimensional character. The band gap, Urbach energy and optical indexes were obtained from optical spectra using Kramers–Kronig analysis (KKA).