FR2038158A7 - Powder material for verneuil crystal - growth - Google Patents

Powder material for verneuil crystal - growth

Info

Publication number
FR2038158A7
FR2038158A7 FR7011605A FR7011605A FR2038158A7 FR 2038158 A7 FR2038158 A7 FR 2038158A7 FR 7011605 A FR7011605 A FR 7011605A FR 7011605 A FR7011605 A FR 7011605A FR 2038158 A7 FR2038158 A7 FR 2038158A7
Authority
FR
France
Prior art keywords
verneuil
degrees
growth
crystal
powder material
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
FR7011605A
Other languages
French (fr)
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.)
Czech Academy of Sciences CAS
Original Assignee
Czech Academy of Sciences CAS
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 Czech Academy of Sciences CAS filed Critical Czech Academy of Sciences CAS
Application granted granted Critical
Publication of FR2038158A7 publication Critical patent/FR2038158A7/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
    • C30B11/00—Single-crystal growth by normal freezing or freezing under temperature gradient, e.g. Bridgman-Stockbarger method
    • C30B11/04—Single-crystal growth by normal freezing or freezing under temperature gradient, e.g. Bridgman-Stockbarger method adding crystallising materials or reactants forming it in situ to the melt
    • C30B11/08—Single-crystal growth by normal freezing or freezing under temperature gradient, e.g. Bridgman-Stockbarger method adding crystallising materials or reactants forming it in situ to the melt every component of the crystal composition being added during the crystallisation
    • C30B11/10—Solid or liquid components, e.g. Verneuil method

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)

Abstract

An intermediate material for the production of corundum, spinel or rutile crystals by the Verneuil technique is prepd. in a spherical, powdery form. An aqs. suspension contng. 0.5-10% of the stoichiometric quantities of hydroxide(s) are dried at 105-500 degrees C. opt. dopant ions of Ga, Cr, Co, Mn, Ni, Ti, V, Fe are added and the mixture finally dehydrated form a max. of 6 hrs. at 300-580 degrees C. The intermediate product is homogeneous does not readily agglomerate, and has low total impurity concn. The noxious gases which are produced from sulphate materials are thus eliminated and the final crystals are of excellent quality with few bubble defects.
FR7011605A 1969-04-02 1970-04-01 Powder material for verneuil crystal - growth Expired FR2038158A7 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CS235169 1969-04-02

Publications (1)

Publication Number Publication Date
FR2038158A7 true FR2038158A7 (en) 1971-01-08

Family

ID=5360392

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7011605A Expired FR2038158A7 (en) 1969-04-02 1970-04-01 Powder material for verneuil crystal - growth

Country Status (1)

Country Link
FR (1) FR2038158A7 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0098724A1 (en) * 1982-06-25 1984-01-18 Sumitomo Chemical Company, Limited Single crystal production

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0098724A1 (en) * 1982-06-25 1984-01-18 Sumitomo Chemical Company, Limited Single crystal production

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Legal Events

Date Code Title Description
ST Notification of lapse