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Title: Quartz crystal growth

Abstract

A process for growing single crystals from an amorphous substance that can undergo phase transformation to the crystalline state in an appropriate solvent. The process is carried out in an autoclave having a lower dissolution zone and an upper crystallization zone between which a temperature differential (.DELTA.T) is maintained at all times. The apparatus loaded with the substance, solvent, and seed crystals is heated slowly maintaining a very low .DELTA.T between the warmer lower zone and cooler upper zone until the amorphous substance is transformed to the crystalline state in the lower zone. The heating rate is then increased to maintain a large .DELTA.T sufficient to increase material transport between the zones and rapid crystallization. .alpha.-Quartz single crystal can thus be made from fused quartz in caustic solvent by heating to 350.degree. C. stepwise with a .DELTA.T of 0.25.degree.-3.degree. C., increasing the .DELTA.T to about 50.degree. C. after the fused quartz has crystallized, and maintaining these conditions until crystal growth in the upper zone is completed.

Inventors:
 [1]
  1. (Albuquerque, NM)
Publication Date:
Research Org.:
AT & T CORP
OSTI Identifier:
868416
Patent Number(s):
US 5135603
Assignee:
United States of America as represented by United States (Washington, DC) SNL
DOE Contract Number:
AC04-76DP00789
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
quartz; crystal; growth; process; growing; single; crystals; amorphous; substance; undergo; phase; transformation; crystalline; appropriate; solvent; carried; autoclave; dissolution; zone; upper; crystallization; temperature; differential; delta; maintained; times; apparatus; loaded; seed; heated; slowly; maintaining; warmer; cooler; transformed; heating; rate; increased; maintain; sufficient; increase; material; transport; zones; rapid; alpha; -quartz; fused; caustic; 350; degree; stepwise; 25; -3; increasing; 50; crystallized; conditions; completed; seed crystals; phase transformation; heating rate; seed crystal; material transport; upper zone; single crystal; single crystals; temperature differential; crystal growth; quartz crystal; dissolution zone; growing single; appropriate solvent; /117/

Citation Formats

Baughman, Richard J. Quartz crystal growth. United States: N. p., 1992. Web.
Baughman, Richard J. Quartz crystal growth. United States.
Baughman, Richard J. Wed . "Quartz crystal growth". United States. doi:. https://www.osti.gov/servlets/purl/868416.
@article{osti_868416,
title = {Quartz crystal growth},
author = {Baughman, Richard J.},
abstractNote = {A process for growing single crystals from an amorphous substance that can undergo phase transformation to the crystalline state in an appropriate solvent. The process is carried out in an autoclave having a lower dissolution zone and an upper crystallization zone between which a temperature differential (.DELTA.T) is maintained at all times. The apparatus loaded with the substance, solvent, and seed crystals is heated slowly maintaining a very low .DELTA.T between the warmer lower zone and cooler upper zone until the amorphous substance is transformed to the crystalline state in the lower zone. The heating rate is then increased to maintain a large .DELTA.T sufficient to increase material transport between the zones and rapid crystallization. .alpha.-Quartz single crystal can thus be made from fused quartz in caustic solvent by heating to 350.degree. C. stepwise with a .DELTA.T of 0.25.degree.-3.degree. C., increasing the .DELTA.T to about 50.degree. C. after the fused quartz has crystallized, and maintaining these conditions until crystal growth in the upper zone is completed.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jan 01 00:00:00 EST 1992},
month = {Wed Jan 01 00:00:00 EST 1992}
}

Patent:

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