GB838575A - Method of growing corundum crystals - Google Patents

Method of growing corundum crystals

Info

Publication number
GB838575A
GB838575A GB19011/58A GB1901158A GB838575A GB 838575 A GB838575 A GB 838575A GB 19011/58 A GB19011/58 A GB 19011/58A GB 1901158 A GB1901158 A GB 1901158A GB 838575 A GB838575 A GB 838575A
Authority
GB
United Kingdom
Prior art keywords
aqueous medium
temperature
nutrient material
autoclave
seed crystal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB19011/58A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Corp
Original Assignee
Western Electric Co Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Western Electric Co Inc filed Critical Western Electric Co Inc
Publication of GB838575A publication Critical patent/GB838575A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C30—CRYSTAL GROWTH
    • C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
    • C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)

Abstract

<PICT:0838575/III/1> A crystal of corumdum is grown on a seed crystal 12 (Fig. 1) in a sealed autoclave 1 containing an aqueous medium 15 and aluminium-containing nutrient material 11, the medium being maintained at a temperature of at least 395 DEG C. in the region of the seed crystal 12 and above this temperature in the region of the nutrient material 11. The nutrient material may be aluminium oxide or aluminium hydroxide, and the aqueous medium may be a solution of sodium or potassium carbonate or hydroxide. The materials are contained in a sealed steel tube 6, which may be lined with silver or platinum, or in a sealed liner of silver inside tube 6 and spaced therefrom, the space being filled with water or aqueous medium. Several seeds may be used, and they are supported by a wire frame 13 having a baffle 14. The aqueous medium fills at least 65% of the free volume of the autoclave at room temperature, and the autoclave is heated to maintain its external mean temperature between 420 DEG C. and 460 DEG C. with the external temperature opposite the nutrient material 30 DEG C. to 35 DEG C. higher than the external temperature opposite the seed crystal. Chromium, cobalt, titanium or nickel may be incorporated in the growing crystal by adding compounds of these metals to the aqueous medium.
GB19011/58A 1957-06-14 1958-06-13 Method of growing corundum crystals Expired GB838575A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US838575XA 1957-06-14 1957-06-14

Publications (1)

Publication Number Publication Date
GB838575A true GB838575A (en) 1960-06-22

Family

ID=22181137

Family Applications (1)

Application Number Title Priority Date Filing Date
GB19011/58A Expired GB838575A (en) 1957-06-14 1958-06-13 Method of growing corundum crystals

Country Status (1)

Country Link
GB (1) GB838575A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4096025A (en) * 1974-02-21 1978-06-20 The United States Of America As Represented By The Secretary Of The Army Method of orienting seed crystals in a melt, and product obtained thereby
US5057286A (en) * 1990-02-05 1991-10-15 The Japan Steel Works, Ltd. Vessel for use in hydrothermal synthesis
EP0581875A1 (en) * 1991-04-22 1994-02-09 CONDEA Vista Company Process for growing crystals

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4096025A (en) * 1974-02-21 1978-06-20 The United States Of America As Represented By The Secretary Of The Army Method of orienting seed crystals in a melt, and product obtained thereby
US5057286A (en) * 1990-02-05 1991-10-15 The Japan Steel Works, Ltd. Vessel for use in hydrothermal synthesis
EP0581875A1 (en) * 1991-04-22 1994-02-09 CONDEA Vista Company Process for growing crystals
EP0581875A4 (en) * 1991-04-22 1995-11-02 Vista Chemical Process for growing crystals
US5569325A (en) * 1991-04-22 1996-10-29 Condea Vista Company Process for growing crystals

Similar Documents

Publication Publication Date Title
GB1069056A (en) Phosphors
GB838575A (en) Method of growing corundum crystals
GB1153802A (en) Method for preparing improved Synthetic Quartz Crystals
GB1468052A (en) Crystals and their manufacture
US3271114A (en) Crystal growth container
GB1061831A (en) Hydrothermal growth of zinc oxide crystals
Beesk et al. X-ray crystal structure of Ag 6 O 2
Chleck et al. The preparation and some properties of radioactive Quinol-Krypton clathrate compounds
GB1303309A (en)
GB682203A (en) Process for growing a single crystal of quartz
SE7711022L (en) WAY TO PRODUCE POWDERED DEXTROS
ES400635A1 (en) Crystallisation of fructose
GB1302008A (en)
GB965345A (en) Improvements in or relating to quartz crystals
ES8205752A1 (en) Suspension of insulin crystals and process for its preparation.
US2983577A (en) Method of producing sodium tetraborate tetrahydrate
US3031264A (en) Production of boric acid
GB423785A (en) Improved process for crystallizing borax from solutions
GB1126628A (en) Blood volume replacement medium
US2537043A (en) Method for synthesizing large single crystals of quartz
Hoag et al. The inner, initial permeability of iron and nickel from 98 to 410 megacycles
US11661674B1 (en) Single crystalline RbUO3 and method of making and using same
GB963757A (en) Improvements in or relating to the manufacture of crystals of alkaline earth metal tungstates and molybdates
GB898739A (en) Improvements in or relating to the production of quartz crystals
GB811214A (en) Improvements in or relating to methods of growing quartz crystals