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Journal of Materials Science

, Volume 44, Issue 2, pp 385–391 | Cite as

Crystallization kinetic studies of CaBi2B2O7 glasses by non-isothermal methods

  • Koushik Majhi
  • K. B. R. VarmaEmail author
Article

Abstract

Transparent glasses of CaBi2B2O7 (CBBO) 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 (Tg) and the crystallization parameters (crystallization activation energy (Ecr) and Avrami exponent (n)) were evaluated under non-isothermal conditions using DSC. The heating rate dependent glass transition and the crystallization temperatures were rationalized by Lasocka equation for the as-quenched CBBO glasses. 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 (Ec(x)) that was determined by Ozawa method increased with the fraction of crystallization (x). The Avrami exponent (n(x)) decreased with the increase in fraction of crystallization (x), suggesting that there was a changeover in the crystallization process from the bulk to the surface.

Keywords

Differential Scanning Calorimetry Crystallization Kinetic Differential Scanning Calorimetry Experiment Differential Scanning Calorimetry Trace Avrami Exponent 

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  1. 1.Materials Research CentreIndian Institute of ScienceBangaloreIndia

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