Abstract
The effects of thermal convection are investigated for the physical vapor transport (PVT) crystal growth process of Hg2Cl2. These effects may lead to increased defect densities and reduced optical homogeneity of the resultant crystals. A two-dimensional axisymmetrical model has been developed and applied to simulate the fluid flow, temperature, and mass concentration distribution in closed ampoules during PVT crystal growth. The numerical parametric studies show that the growth rate increases with the one-quarter power of the Raleigh number, Ra0.25, for 0<or= Delta T<or=30 K (0<or=Ra<or=2.62*103), and with Ra1.5 in the temperature range of 30<or= Delta T<or=50 K (2.62*103<or=Ra<or=4.73*103). The effect of thermal convection is shown to be negligible for gravitational accelerations less than the order of 10-1g0, for low-aspect-ratio enclosures. The growth rate of Hg2Cl2 decreases exponentially with an increase in the partial pressure of an impurity B, as well as with a decrease in the ampoule aspect ratio AR (radius to transport length) for 0.05<or=AR<or=0.20.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Modelling and Simulation in Materials Science and Engineering
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
