Glass transition and crystallization kinetics of lithium modified zinc borate semiconducting glasses by non-isothermal method

Glass transition and crystallization kinetics of lithium-modified zinc borate glasses of the system 20ZnO center dot xLi(2)O. (80-x) B2O3 (x = 10, 20, 30 and 40) have been studied using the non-isothermal method of differential scanning calorimetry (DSC). The 20ZnO center dot 10Li(2)O center dot 70 B2O3 glass composition has the highest thermal stability and the glass-forming tendency among all other glasses. The activation energy associated with crystallization ((210-318) kJ/mol)), glass transition ((464-531) kJ/mol)), Avrami exponent (3) and frequency factor (2.49 x 10(9)-2.32 x 10(17)) were extracted from the fitting of different theoretical models and the values are in close agreement with each other. The value of the Avrami exponent was found similar to 3 thereby indicates the occurrence of volume nucleation with two-dimensional growth in the currently studied glass system. The formation of Pure monoclinic LiZnBO3 crystalline phase is observed in 20ZnO center dot 30Li(2)O center dot 50B(2)O(3) and 20ZnO center dot 40Li(2)O center dot 40B(2)O(3) glass compositions which is a potential candidate for electric double-layer capacitance fabrication.