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Stirring a Crystal Growing Melt in a Sealed System

IP.com Disclosure Number: IPCOM000077637D
Original Publication Date: 1972-Aug-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Gunn, JB: AUTHOR

Abstract

In growing crystals of some compounds (e.g., III - V semiconductors), the high pressure and reactive nature of the atmosphere over the melt requires that a completely sealed system be used. Problems then arise in keeping the melt stirred. One approach to stirring the melt is to utilize the common method of sloshing a fluid around the inside of a container, by moving the center of the container briskly in a horizontal circular path without rotating the container. The liquid can be caused to travel so fast around the inside of the container that it overflows the rim. A motion of the same or related type can be applied to a sealed system to obtain continuous vigorous stirring of a melt.

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Stirring a Crystal Growing Melt in a Sealed System

In growing crystals of some compounds (e.g., III - V semiconductors), the high pressure and reactive nature of the atmosphere over the melt requires that a completely sealed system be used. Problems then arise in keeping the melt stirred. One approach to stirring the melt is to utilize the common method of sloshing a fluid around the inside of a container, by moving the center of the container briskly in a horizontal circular path without rotating the container. The liquid can be caused to travel so fast around the inside of the container that it overflows the rim. A motion of the same or related type can be applied to a sealed system to obtain continuous vigorous stirring of a melt.

In the side and vertical plan views of Figs. 1 and 2, a mechanism is shown which accomplishes stirring of the melt utilizing a sloshing motion. In Fig. 1, a crucible 1 containing a melt 2 from which a crystal can be grown is disposed in a sealed pressure vessel 3. Pressure vessel 3 is fixedly mounted on a table 4 to which the desired motion is applied via cranks 5, causing the surface of melt 2 to form an angle with the horizontal as it is stirred within crucible 1. Cranks 5 are connected to table 4 via crank pins and bearings shown schematically at 6. Cranks 5 are connected to crank gears 7 and are caused to rotate in place in shaft bearings shown schematically at 8; the latter being mounted on a fixed frame, not shown. A driving gear 9 connected to a driving motor 10 simultaneously rotates crank gears 7 in the same direction, causing table 4 to be driven in a circular path by cranks 5....