Influence of the crucible geometry on the shape of the melt-crystal interface during growth of sapphire crystal using a heat exchanger method

Jyh Chen Chen, Chung Wei Lu

Research output: Contribution to journalConference articlepeer-review

32 Scopus citations

Abstract

Computer simulations using the commercial code FIDAP, which is based on finite element techniques, were performed to investigate the effect of the shape of the crucible on the temperature distribution, velocity distribution and shape of the melt-crystal interface, during the application of the heat exchanger method (HEM) of growing sapphire crystals. Heat transfer from the furnace to the crucible and heat extraction from the heat exchanger can be modeled by the convection boundary conditions. Cylindrical crucibles with differently curved corners at their base are considered. The curved base of the crucible decreases the convexity of the melt-crystal interface and suppresses the appearance of "hot spots". A hemispherically shaped crucible base yields the lowest maximum convexity. The variation in convexity of the melt-crystal interface is less abrupt for a cylindrical crucible with curved corners at the base than one without curved corners. The effects of the thickness and the conductivity of the crucible are also addressed. The convexity of the melt-crystal interface decreases as the thickness of the crucible wall increases. The convexity also declines as the conductivity of the crucible increases.

Original languageEnglish
Pages (from-to)239-245
Number of pages7
JournalJournal of Crystal Growth
Volume266
Issue number1-3
DOIs
StatePublished - 15 May 2004
EventProceedings of the Fourth International Workshop on Modeling - Kyushu, Japan
Duration: 4 Nov 20037 Nov 2003

Keywords

  • A1. Convexity
  • A1. Crucible geometry
  • A2. Heat exchanger method
  • A2. Single crystal growth
  • B1. Sapphire

Fingerprint

Dive into the research topics of 'Influence of the crucible geometry on the shape of the melt-crystal interface during growth of sapphire crystal using a heat exchanger method'. Together they form a unique fingerprint.

Cite this