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Crystallization kinetics of SrBi2B2O7 glasses by non-isothermal methods

Majhi, Koushik and Varma, KBR (2009) Crystallization kinetics of SrBi2B2O7 glasses by non-isothermal methods. In: Journal of Thermal Analysis and Calorimetry, 98 (3). pp. 731-736.

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Abstract

Transparent glasses of SrBi2B2O7 (SBBO) were fabricated via the conventional melt-quenching technique. The amorphous and the glassy nature of the as-quenched samples were, respectively, confirmed by X-ray powder diffraction (XRD) and differential scanning calorimetry (DSC). The glass transition (T (g)) and the crystallization parameters [crystallization activation energy (E (cr)) and Avrami exponent (n)] were evaluated under non-isothermal conditions using DSC. There was a close agreement between the activation energies for the crystallization process determined by Augis and Bennet and Kissinger methods. The variation of local activation energy [E (c)(x)] that was determined by Ozawa method, decreased with the fraction of crystallization (x). The Avrami exponent (n(x)) increased with the increase in fraction of crystallization (x) suggesting that there was a change over in the crystallization process from the surface to the bulk.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to Springer.
Keywords: Glass transition; Crystallization; Borate; Non-linear optics; Polar; Activation energy
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Depositing User: Id for Latest eprints
Date Deposited: 12 Jan 2010 10:02
Last Modified: 19 Sep 2010 05:54
URI: http://eprints.iisc.ac.in/id/eprint/25363

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