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Influence of the atmosphere on the growth of LiYF4 single crystal fibers by the micro-pulling-down method

✍ Scribed by D. Maier; R. Bertram; D. Klimm; R. Fornari

Publisher: John Wiley and Sons
Year: 2009
Tongue: English
Weight: 115 KB
Volume: 44
Category: Article
ISSN: 0232-1300
DOI: 10.1002/crat.200800400

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✦ Synopsis

Micro-pulling-down growth of LiYF 4 single crystal fibers have been performed under different gas atmospheres using stoichiometric LiYF 4 single crystal pieces from prior Czochralski experiments as starting material. Completely transparent and phase pure LiYF 4 single crystal fibers could be obtained after evacuation of the recipient to 2 × 10 -6 mbar and subsequent filling with pure (99.995%) CF 4 gas. Using a gas mixture of 5% CF 4 in Argon or pure 5N Argon leads to the formation of micro crystallites of oxofluorides on the surface. Evacuating only to 3 × 10 -3 mbar leads, independently of atmosphere, to completely white fibers that are heavily contaminated with oxofluorides. DSC measurements of the completely transparent fiber grown under pure CF 4 atmosphere reveal congruent melting behavior.

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