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Polycrystallinity of (100) Oriented Crystals

IP.com Disclosure Number: IPCOM000074820D
Original Publication Date: 1971-Jun-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 20K

Publishing Venue

IBM

Related People

Ghee, RC: AUTHOR [+3]

Abstract

A method has been developed for obtaining (100) crystals that can be grown to long lengths (3'') without the occurrence of polycrystallinity. Slight misorientations of seeds in (100) crystal growth result in poly crystalline growth occurring at the periphery of the crystal, after 3'' - 4'' of crystal have been grown. This is unlike the growth of (111) crystals in which slight seed misorientations can be tolerated without deleterious effects to the structure.

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Polycrystallinity of (100) Oriented Crystals

A method has been developed for obtaining (100) crystals that can be grown to long lengths (3'') without the occurrence of polycrystallinity. Slight misorientations of seeds in (100) crystal growth result in poly crystalline growth occurring at the periphery of the crystal, after 3'' - 4'' of crystal have been grown. This is unlike the growth of (111) crystals in which slight seed misorientations can be tolerated without deleterious effects to the structure.

In the usual seed cutting process, the butt end of the seed crystal is oriented by an optical reflectogram or x-ray and the sides of the square seed are cut, as nearly as can be determined mechanically, perpendicular to the butt end. However, in the cutting of (111) seeds for the diamond cubic lattice, the major planes (100 and 110) are already perpendicular to the butt end (the end which will be used to start the crystal) and can be individually oriented by an optical reflectogram or x-ray. Thus, as in the drawing, the two (100) faces (X and Y) can be individually oriented within 0-2 degrees of the (100) plane. These two faces mate against the seed chuck, thus assuring that growth will occur on a plane closely corresponding to the (100) plane.

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