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Structure effects on glass stability and crystallization


Glass stability and crystallization activation energy (Ec) were evaluated in a pure devitrite glass (Na2Ca3Si6O16), and two other glasses which 4 mol% and 8 mol% of devitrite glass were replaced by TiO2 (Dev, 4Ti and 8Ti, respectively). The results were linked to glass-structure studies found in the literature. Glass stability parameters were calculated from DSC experiments, with the aid of the equations: K2 = Tx - Tg and KM = (Tx - Tg)2/Tg. It was observed, for all equations, that the glass stability values increase with the addition of the TiO2 contents. This behavior was a consequence of the two factors: decrease of the glass-modifier concentrations (Na+ and Ca2+), and Ti ions added on the glass-network acting as glass-former in which Si–O–Si were replaced by Si–O–Ti4+ tetrahedrons. Isothermal heat treatments were carried out at 800 °C, it was verified by scanning electron microscopy that TiO2 does not act as nucleant agent in the Na2Ca3Si6O16, and that surface crystallization was predominant for all glasses studied in this work. Kissinger equation was used to obtain crystallization activation energy (Ec), it was observed that Ec values decreased with the TiO2 addition, this behavior was explained regarding the bond energy dissociation (Si–O and Ti–O) and calculated viscosity data.

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Publication details

The article was received on 10 Dec 2017, accepted on 05 Mar 2018 and first published on 05 Mar 2018

Article type: Paper
DOI: 10.1039/C7CE02135F
Citation: CrystEngComm, 2018, Accepted Manuscript
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    Structure effects on glass stability and crystallization

    A. Rodrigues Mendes, L. D. Silva, R. Zhang and V. O. Soares, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C7CE02135F

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