Structural, ac conductivity and electric modulus studies of lithium based quaternary silicate glasses synthesised by the sol-gel route

Author： Muralidharan P. Satyanarayana N. Venkateswarlu M.

Publisher： Society of Glass Technology

ISSN： 0031-9090

Source： Physics and Chemistry of Glasses - European Journal of Glass Science and Technology Part B, Vol.46, Iss.3, 2005-06, pp. : 293-301

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Abstract

Lithium phosphoborosilicate (LPBS) glasses with various modifier (m) to former (f) ratio (m/f) were synthesised through the sol-gel route. The sol-gel process was monitored by XRD and DSC techniques to optimise the LPBS glass forming temperature. The structure of LPBS glasses was studied using XRD, FTIR and DSC techniques. The conductivity of LPBS glasses was calculated from impedance data analysis It is found that the 20Li₂O–80[0·1P₂O₅+0·9(0·2B₂O₃+0·8SiO₂)] glass showed the highest conductivity, σ=1·28(±0·01)×10^-7 Scm^-1 at 443K, with activation energy E_a=0·50(±0·03) eV. AC conductivity data were analysed using Jonscher's power law (JPL), where the power law exponent (s) exhibits a low value for high conducting LPBS glass and a nonlinear behaviour with varying temperature. The electric modulus data were fitted with Kohlraush–Williams–Watts (KWW) stretched exponential function, and the modulus formalism was used to study the ionic relaxation behaviour at different temperatures in LPBS glasses with various m/f ratios.