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Non-isothermal crystallization kinetics of some basaltic glass-ceramics containing CaF2 as nucleation agent

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Abstract

The crystallization mechanism of the glass-ceramics obtained from Romanian (Şanoviţa) basalt in the presence of 3 and 5% CaF2 as nucleation agent has been investigated under non-isothermal conditions using DTA technique. The activation energies of the crystallization processes were calculated using the Kissinger-Akahira-Sunose, Ozawa-Flynn-Wall, Starink and Tang isoconversional methods. The monotonous decreases in the activation energy (E a) with the crystallized fraction (α) confirms the complex mechanism of the glass-ceramics crystallization process. It has been proved that the Johnson-Mehl-Avrami model cannot be applied for the studied glass-ceramics crystallization process.

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Authors and Affiliations

  1. Faculty of Industrial Chemistry and Environmental Engineering, “Politehnica” University of Timişoara, P-ţa Victoriei No. 2, 300006, Timisoara, Romania

    C. Păcurariu, R. I. Lazău, I. Lazău & R. Ianoş

  2. Faculty of Pharmacy, University of Medicine and Pharmacy “Victor Babeş”, P-ţa E. Murgu no. 2, Timisoara, Romania

    B. Tiţa

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  1. C. Păcurariu
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  2. R. I. Lazău
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  3. I. Lazău
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  4. R. Ianoş
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  5. B. Tiţa
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Correspondence to C. Păcurariu.

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Păcurariu, C., Lazău, R.I., Lazău, I. et al. Non-isothermal crystallization kinetics of some basaltic glass-ceramics containing CaF2 as nucleation agent. J Therm Anal Calorim 97, 507–513 (2009). https://doi.org/10.1007/s10973-009-0369-9

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