Use of an axial magnetic field to suppress convection in the solvent of Ge_0.98Si_0.02 grown by the travelling solvent method
by L. Abidi, M.Z. Saghir, D. Labrie
International Journal of Materials and Product Technology (IJMPT), Vol. 22, No. 1/2/3, 2005

Abstract: A three dimensional numerical simulation of the effect of an axial magnetic field on the fluid flow, heat and mass transfer within the solvent of Ge_0.98Si_0.02 grown by the travelling solvent method is presented. The feed rod consists of a Ge_0.85Si_0.15 polycrystalline material, a Ge_0.98Si_0.02 rod which acts as the solvent and a germanium seed located at the bottom of the sample. It is found that a strong convective flow exists in the solvent, which is known to be undesirable to achieve a uniform crystal. An external axial magnetic field is applied to suppress this convection. By increasing the magnetic induction it is observed that the intensity of the flow at the centre of the crucible reduces at a faster rate than near the wall. This phenomenon creates a stable and flat growth interface and the silicon distribution in the horizontal plane becomes relatively homocentric. The maximum velocity is found to obey a logarithmic law with respect to the Hartmann number U_max ∝ H_a^-7/4.

Online publication date: Tue, 30-Nov-2004

The full text of this article is only available to individual subscribers or to users at subscribing institutions.

 
Existing subscribers:
Go to Inderscience Online Journals to access the Full Text of this article.

Pay per view:
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.

Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Materials and Product Technology (IJMPT):
Login with your Inderscience username and password:

Username:        Password:          Forgotten your password?

Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.

If you still need assistance, please email subs@inderscience.com