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Influence of the atmosphere on the growth of LiYF 4 single crystal fibers by the micro‐pulling‐down method
Author(s) -
Maier D.,
Bertram R.,
Klimm D.,
Fornari R.
Publication year - 2009
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.200800400
Subject(s) - argon , crystallite , crystal (programming language) , single crystal , atmosphere (unit) , fiber , stoichiometry , materials science , argon gas , crystal growth , analytical chemistry (journal) , micro pulling down , chemistry , crystallography , mineralogy , composite material , chromatography , organic chemistry , thermodynamics , physics , computer science , programming language
Abstract 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. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)