GB676212A - Improvements in or relating to methods and apparatus for growing crystals - Google Patents

Improvements in or relating to methods and apparatus for growing crystals

Info

Publication number
GB676212A
GB676212A GB397149A GB397149A GB676212A GB 676212 A GB676212 A GB 676212A GB 397149 A GB397149 A GB 397149A GB 397149 A GB397149 A GB 397149A GB 676212 A GB676212 A GB 676212A
Authority
GB
United Kingdom
Prior art keywords
tank
solute
rate
addition
growing
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
GB397149A
Inventor
Arthur James Warner
Stanley George Foord
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB397149A priority Critical patent/GB676212A/en
Publication of GB676212A publication Critical patent/GB676212A/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
    • C30B7/00—Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions

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:0676212/III/1> In a process for growing single crystals by circulating nutrient solution between a dissolving tank 1 and a growing tank 13 maintained at constant, different temperatures, solute is added substantially continuously to the tank 1 from hopper 51 and the rate of addition is automatically controlled to maintain the concentration in the tank substantially constant. The temperature in the dissolving tank is maintained at least 1 DEG C above that at which the solution would be saturated. As described pump 12 draws solution from tank 1 through filter 8 and viscosity meter 10 and delivers it to the bottom of container 13. Increases and decreases in viscosity (and hence concentration) are used, (see Group XXXV), to decrease or increase the rate of addition of solute from the hopper 51. The containers 1, 13 are heated by electrical jackets 2, 14 and the temperatures are thermostatically controlled. Connecting pipes 11, 17 are also heated. Seed crystals 23 are carried by a spider 22 in container 13, the spider being rotated first one way and then the other by suitable means. Instead of viscosity any other parameter, e.g. density, dependent upon concentration may be used to control the addition of solute. Alternatively the rate of addition of solute may be preset in accordance with the rate of crystal growth as determined over the entire growing period by experiment. The crystallization of ethylene diamine tartrate is referred to using a solution which would be saturated at 45 DEG C with a temperature of 50 DEG C in the dissolving tank and of 42.5 DEG C in the growing tank.
GB397149A 1949-02-14 1949-02-14 Improvements in or relating to methods and apparatus for growing crystals Expired GB676212A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB397149A GB676212A (en) 1949-02-14 1949-02-14 Improvements in or relating to methods and apparatus for growing crystals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB397149A GB676212A (en) 1949-02-14 1949-02-14 Improvements in or relating to methods and apparatus for growing crystals

Publications (1)

Publication Number Publication Date
GB676212A true GB676212A (en) 1952-07-23

Family

ID=9768348

Family Applications (1)

Application Number Title Priority Date Filing Date
GB397149A Expired GB676212A (en) 1949-02-14 1949-02-14 Improvements in or relating to methods and apparatus for growing crystals

Country Status (1)

Country Link
GB (1) GB676212A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006029830A1 (en) * 2006-06-27 2008-01-03 Schmidt-Köksal, Michael Growing of deuterated alanine doped triglycine sulfate monocrystals from a solution for night vision device, comprises arranging a crystal holder in a chamber of a device and pumping the solution in a circulation with the chamber
FR2909687A1 (en) * 2006-12-06 2008-06-13 Centre Nat Rech Scient Preparing deutrated potassium dihydrogen phosphate crystal, comprises producing crystalline solution with part of supersaturated solution of the compound, and continuous circulating solution between crystallization and saturation chambers

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006029830A1 (en) * 2006-06-27 2008-01-03 Schmidt-Köksal, Michael Growing of deuterated alanine doped triglycine sulfate monocrystals from a solution for night vision device, comprises arranging a crystal holder in a chamber of a device and pumping the solution in a circulation with the chamber
DE102006029830B4 (en) * 2006-06-27 2011-02-24 Schmidt-Köksal, Michael Process and device for producing pyroelectric single crystals
FR2909687A1 (en) * 2006-12-06 2008-06-13 Centre Nat Rech Scient Preparing deutrated potassium dihydrogen phosphate crystal, comprises producing crystalline solution with part of supersaturated solution of the compound, and continuous circulating solution between crystallization and saturation chambers
WO2008081103A3 (en) * 2006-12-06 2008-09-12 Centre Nat Rech Scient Crystal growth in a solution in stationary conditions
US8771379B2 (en) 2006-12-06 2014-07-08 Centre National De La Recherche Scientifique (C.N.R.S.) Crystal growth in solution under static conditions

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