US 5,290,395 A · Method of and apparatus for preparing single crystal

Abstract

A method and an apparatus for pulling a compound single crystal from a raw material molten solution is constructed to cause the solution to flow into a second crucible provided in a first crucible containing the raw material molten solution which is continuously synthesized from a plurality of raw materials, through a communicating hole formed in the bottom portion of the second crucible. The single crystal is pulled while the raw material molten solution is continuously synthesized from the plurality of raw materials, whereby it is possible to pull a long single compound crystal through a single pulling step from the raw material molten solution which is contained in the second crucible. An excellent state of a solid-liquid interface is maintained to obtain a quality single crystal.

Claims20

Dependent claims

A method of manufacturing a compound single crystal made of at least two initially separate starting material elements comprising the following steps:

(a) supplying said starting material elements from respective separate containers into a synthesizing chamber forming a first crucible,
(b) maintaining in said synthesizing chamber a controlled environment at a temperature for producing a melt,
(c) continuously reacting and synthesizing said at least two starting material elements in said synthesizing chamber thereby producing a compound melt,
(d) communicating a second crucible inside said first crucible with said first crucible to maintain a pool of said compound melt in said second crucible, said communicating taking place isolated from said reacting and synthesizing, whereby said second crucible isolates said pool of compound melt from any vibrations and non-uniform temperature distributions in said first crucible, and
(e) pulling said compound single crystal from said compound melt in said pool, whereby synthesizing and pulling take place simultaneously.

2 more elements

Dependencies are inferred from the claim text.

Method of and apparatus for preparing single crystal

Life of this patent

Method of and apparatus for preparing single crystal

Life of this patent

Abstract

Claims20