Crystallisation kinetics in AO-Al2O3-SiO2-B2O3 glasses (A = Ba, Ca, Mg)
作者： N. Lahl , K. Singh , L. Singheiser , K. Hilpert , D. Bahadur
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摘要: The crystallisation kinetics of AO-Al2O3-SiO2-B2O3glasses (A = Ba, Ca, Mg) was investigated using DTA, XRD, and microstructural studies. Moreover, the influence nucleating agentssuch as TiO2, ZrO2, Cr2O3, Ni on MgO base glasses waselucidated. are interest for development ofsealants in Solid Oxide Fuel Cells (SOFC). activation energy ofcrystal growth, Ea, evaluated different glassesusing modified Kissinger equation. preparation method theglasses seems to determine whether surface or bulk nucleation is thedominant mechanism. Ea values vary between 330 and622 kJ/mol. agents tend enhance exceptZrO2. An increase Al2O3 concentration induces phaseseparation decreases Ea. results discussed onthe basis structural role chemical properties Alions well with respect possible use inSOFC.
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