Laser-induced crystallization of glassy caesium metaborate studied by Raman spectroscopy

The Raman spectra of crystalline and amorphous solids with the caesium metaborate composition reveal that while the former consists solely of BØ 2O − units in ring metaborate arrangements, the latter contains a significant fraction of BØ 4 − tetrahedra as well (Ø,O: bridging and non-bridging oxygen...

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Bibliographic Details
Published in:Journal of non-crystalline solids 1990, Vol.116 (1), p.115-122
Main Authors: Kamitsos, E.I., Karakassides, M.A., Patsis, A.P., Chryssikos, G.D.
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Equations of state, phase equilibria, and phase transitions
Exact sciences and technology
Physics
Specific phase transitions
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Summary:The Raman spectra of crystalline and amorphous solids with the caesium metaborate composition reveal that while the former consists solely of BØ 2O − units in ring metaborate arrangements, the latter contains a significant fraction of BØ 4 − tetrahedra as well (Ø,O: bridging and non-bridging oxygen atoms, respectively). The laser-induced crystallization of the glass, monitored in situ by Raman scattering, is found to proceed via the isomerization reaction: BØ 4 − ⇌BØ 2O −. Kinetic data were obtained from the Raman spectra, at T = 200 ± 20°C, and indicate a Johnson-Mehl-Avrami time dependence of the crystallized volume, with a rate constant k = (1.2±0.1)×10 −3s −1 and Avrami factor n = 1.8±0.1.
ISSN:0022-3093
1873-4812
DOI:10.1016/0022-3093(90)91053-T