Early Stages of Crystallization of Lanthanum-Borogermanate Glass by a Femtosecond Laser Beam

Regions in the bulk of lanthanum borogermanate glass modified by a femtosecond laser beam were studied by means of optical microscopy and confocal Raman scattering (RS) spectroscopy. The obtained data show that, at the stages preceding the formation of an LaBGeO 5 microcrystal, upon irradiation by a...

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Bibliographic Details
Published in:Glass and ceramics 2018-09, Vol.75 (5-6), p.213-216
Main Authors: Lipat’ev, A. S., Lotarev, S. V., Lipat’eva, T. O., Lopatina, E. V., Sigaev, V. N.
Format: Article
Language:English
Subjects:
Ceramics
Characterization and Evaluation of Materials
Chemistry and Materials Science
Composites
Crystallization
Femtosecond lasers
Femtosecond pulsed lasers
Glass
Irradiation
Lanthanum
Laser beam heating
Lasers
Materials Science
Microcrystals
Microscopes
Nanocrystals
Natural Materials
Optical microscopy
Raman spectra
Rare earth metal compounds
Science for Glass Production
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Summary:Regions in the bulk of lanthanum borogermanate glass modified by a femtosecond laser beam were studied by means of optical microscopy and confocal Raman scattering (RS) spectroscopy. The obtained data show that, at the stages preceding the formation of an LaBGeO 5 microcrystal, upon irradiation by a femtosecond beam in a certain interval of laser pulse energy germanium nanocrystals precipitate in the zone of local heating. The correlation between the conditions of laser irradiation leading to the appearance of germanium nanocrystals and the conditions ensuring with high probability the crystallization of phases of the low-temperature modification of lanthanum borate and stillwellite-like lanthanum borogermanate suggest that germanium nanocrystals can serve as nuclei for heterogeneous crystallization of LaBO 3 and LaBGeO 3 .
ISSN:0361-7610
1573-8515
DOI:10.1007/s10717-018-0057-y