Crystal Research and Technology
Cryst. Res. Technol. 41, 972 (2006) - Abstract -

Evaporation induced diameter control in fiber crystal growth by micro-pulling-down technique: Bi4Ge3O12

V. Chani, K. Lebbou, B. Hautefeuille, O. Tillement, and J.-M. Fourmigue*

Physical Chemistry of Luminescent Materials, Claude Bernard Lyon1 University, CNRS UMR 5620, Bat. A. Kastler, 10 rue Ampère, 69622 Villeurbanne Cedex, France
*FiberCryst, 23 rue Royale, F-69001 Lyon, France

Keywords fiber, crystal, growth, micro-pulling-down, diameter, evaporation, Bi4Ge3O12
PACS 68.03.Fg, 81.05.Lg, 81.05.Zx, 81.10.Fq, 42.81.–i, 81.30.Dz, 29.40.Mc
DOI 10.1002/crat.200610707

Diameter self-control was established in Bi4Ge3O12 fiber crystal growth by micro-pulling-down technique. In accordance with Bi2O3-GeO2 phase diagram, the diameter was controlled due to compensation of solidification with evaporation of volatile Bi2O3 self-flux charged into the crucible with excess. The crucibles had capillary channels of 310 or 650 ìm in outer diameter. The crystals up to 400 mm long and 50-300 ìm in diameter were grown at pulling-down rates of 0.04-1.00 mm/min. The melt composition and the pulling rate were generally only two parameters determining solidification rate. As a result, crystals with uniform (± 10%) diameter and aspect ratio up to 104 were produced without automation of the process.




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