Characteristics of La2CaB10O19 crystallization from glass

I. Dyamant, E. Korin, J. Hormadaly

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

The characteristics of La2CaB10O19 (LCB) crystallization from a La2O3-CaO-B2O 3 glass were studied. The crystal growth rate (U) was estimated from the crystalline layer thicknesses to obtain the activation energy for growth (EG), which was found to be 418 kJ/mol. The activation energy for overall crystallization (E), obtained from non-isothermal differential thermal analysis (DTA) by the methods of Kissinger and Ozawa, was in the range of 398-417 kJ/mol. A comparison of the activation energies showed that E ≅ EG. X-ray diffraction (XRD) patterns, light microscopy images and second harmonic generation tests, confirmed that LCB is the dominant phase crystallizing from the glass. Nucleation-rate type curves derived from DTA measurements showed that the annealed glass behaved as a nuclei site-saturated matrix. Transmission electron microscopy and selected area electron diffraction images of fine glass powders indicated the presence of crystalline clusters of 30-50 nm, which are related to the phases detected by XRD. The crystallization of LCB from the glass was characterized by a growth process from a nuclei site-saturated matrix and could be analyzed by the Johnson-Mehl-Avarmi kinetic model.

Original languageEnglish
Pages (from-to)1784-1790
Number of pages7
JournalJournal of Non-Crystalline Solids
Volume356
Issue number35-36
DOIs
StatePublished - 1 Aug 2010

Keywords

  • Differential thermal analysis
  • Glass crystallization
  • Growth rate
  • La CaBO
  • Second harmonic generation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

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