Evaporation induced diameter control in fiber crystal growth by micro-pulling-down technique: Bi4Ge3O12
✍ Scribed by V. Chani; K. Lebbou; B. Hautefeuille; O. Tillement; J.-M. Fourmigue
- Publisher
- John Wiley and Sons
- Year
- 2006
- Tongue
- English
- Weight
- 413 KB
- Volume
- 41
- Category
- Article
- ISSN
- 0232-1300
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✦ Synopsis
Diameter self-control was established in Bi 4 Ge 3 O 12 fiber crystal growth by micro-pulling-down technique. In accordance with Bi 2 O 3 -GeO 2 phase diagram, the diameter was controlled due to compensation of solidification with evaporation of volatile Bi 2 O 3 self-flux charged into the crucible with excess. The crucibles had capillary channels of 310 or 650 µm in outer diameter. The crystals up to 400 mm long and 50-300 µm 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 10 4 were produced without automation of the process.