Open AccessNon-isothermal crystallization of lithium germanophosphate glass studied by different kinetic methods
Author(s) -
Srdjan Matijasevic,
Snežana Grujić,
Vladimir Topalović,
Jeleikolić,
Sonja Smiljanić,
Nebojša Labus,
Veljko Savić
Publication year - 2018
Publication title -
science of sintering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.309
H-Index - 25
eISSN - 1820-7413
pISSN - 0350-820X
DOI - 10.2298/sos1802193m
Subject(s) - crystallization , nucleation , activation energy , materials science , kinetic energy , thermodynamics , isothermal process , precipitation , lithium (medication) , differential thermal analysis , crystal (programming language) , phase (matter) , crystal growth , thermal analysis , kinetics , thermal , chemistry , diffraction , optics , medicine , physics , organic chemistry , quantum mechanics , meteorology , computer science , programming language , endocrinology
Crystallization kinetics of 22.5Li2O•10Al2O3•30GeO2•37.5P2O5 (mol%) glass was studied under non-isothermal condition using the differential thermal analysis (DTA). The study was performed by using the first crystallization peak temperature (Tp1) which belongs to the precipitation of LiGe2(PO4)3 phase in the glass. The activation energy of glass crystallization (Ea) was determined using different isokinetic methods. The dependence of Ea on the degree of glass-crystal transformation (α) was studied using model-free isoconversional linear integral KAS (Kissinger–Akahira–Sunose) and FWO (Flynn–Wall–Ozawa) methods. It was shown that the Ea varies with α and hence with temperature and consequently the glass/crystal transformation can be described as a complex process involving different mechanisms of nucleation and growth.
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