GB1457275A - Growth of crystalline material - Google Patents

Growth of crystalline material

Info

Publication number
GB1457275A
GB1457275A GB3505873A GB3505873A GB1457275A GB 1457275 A GB1457275 A GB 1457275A GB 3505873 A GB3505873 A GB 3505873A GB 3505873 A GB3505873 A GB 3505873A GB 1457275 A GB1457275 A GB 1457275A
Authority
GB
United Kingdom
Prior art keywords
crystal
inertia
armature
moment
rod
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
GB3505873A
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.)
UK Secretary of State for Defence
Original Assignee
UK Secretary of State for Defence
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 UK Secretary of State for Defence filed Critical UK Secretary of State for Defence
Priority to GB3505873A priority Critical patent/GB1457275A/en
Publication of GB1457275A publication Critical patent/GB1457275A/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
    • C30B15/00—Single-crystal growth by pulling from a melt, e.g. Czochralski method
    • C30B15/20—Controlling or regulating
    • C30B15/22—Stabilisation or shape controlling of the molten zone near the pulled crystal; Controlling the section of the crystal
    • 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
    • C30B15/00—Single-crystal growth by pulling from a melt, e.g. Czochralski method
    • C30B15/20—Controlling or regulating
    • C30B15/22—Stabilisation or shape controlling of the molten zone near the pulled crystal; Controlling the section of the crystal
    • C30B15/24—Stabilisation or shape controlling of the molten zone near the pulled crystal; Controlling the section of the crystal using mechanical means, e.g. shaping guides

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Liquid Deposition Of Substances Of Which Semiconductor Devices Are Composed (AREA)

Abstract

1457275 Measuring moment of inertia of rotors DEFENCE SECRETARY OF STATE FOR 22 July 1974 [23 July 1973] 35058/73 Heading G1N [Also in Divisions B1 and G3] A system for controlling the cross-sectional area of a crystal when being grown from a melt comprises a crystal puller fitted with means for measuring the effective inertial mass of the crystal when being pulled. As shown, in Fig. 1 a crucible 5 is heated by an induction heater grid 11 to produce a melt 7. A pull rod 1 suspended from and rotated by a torque motor 3 carries a crystal seed 9a in which the crystal is grown from the melt, the rod 1 and torque motor 3 being raised by motor 13. A current source 19 provides simultaneously D.C. and A.C. components of power to motor 3. The D.C. component is used to rotate the armature 6 and the crystal at a steady rate, whilst the A.C. component is used to provide superimposed on the steady rotation an oscillatory motion of the armature 6. It is stated that in these circumstances the moment of inertia of the armature is represented by the capacitance of the armature winding and this is measured in a bridge 21 (Fig. 2). The fixed moment of inertia of the armature 6, rod 1 and seed 9a is subtracted at 31 to produce an output signal representative only of the moment of inertia of the crystal 9. A signal representative of the position of the rod 1 at any given time is produced by indicator 25 and fed along with the signal from the inertia gauge 21 to a comparator 23 which produces an output control signal to modulate the power supplied to the heater coil 11.
GB3505873A 1973-07-23 1973-07-23 Growth of crystalline material Expired GB1457275A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3505873A GB1457275A (en) 1973-07-23 1973-07-23 Growth of crystalline material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3505873A GB1457275A (en) 1973-07-23 1973-07-23 Growth of crystalline material

Publications (1)

Publication Number Publication Date
GB1457275A true GB1457275A (en) 1976-12-01

Family

ID=10373291

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3505873A Expired GB1457275A (en) 1973-07-23 1973-07-23 Growth of crystalline material

Country Status (1)

Country Link
GB (1) GB1457275A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3640868A1 (en) * 1986-11-29 1988-06-09 Leybold Ag Apparatus for determining the diameter of a crystal on pulling from a melt
EP0293757A2 (en) * 1987-05-30 1988-12-07 Forschungszentrum Jülich Gmbh Process and apparatus to determine a parameter for the transition region between crystal and melt
DE19806949A1 (en) * 1998-02-19 1999-08-26 Leybold Systems Gmbh Crystal growth process control e.g. in the growth of germanium or silicon single crystals by the Czochralski method
US6341173B2 (en) 1997-09-03 2002-01-22 Leybold Systems Gmbh Device and method for the determination of diameters of crystals

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3640868A1 (en) * 1986-11-29 1988-06-09 Leybold Ag Apparatus for determining the diameter of a crystal on pulling from a melt
EP0293757A2 (en) * 1987-05-30 1988-12-07 Forschungszentrum Jülich Gmbh Process and apparatus to determine a parameter for the transition region between crystal and melt
EP0293757A3 (en) * 1987-05-30 1990-07-11 Kernforschungsanlage Juelich Process and apparatus to determine a parameter for the transition region between crystal and melt
US6341173B2 (en) 1997-09-03 2002-01-22 Leybold Systems Gmbh Device and method for the determination of diameters of crystals
DE19806949A1 (en) * 1998-02-19 1999-08-26 Leybold Systems Gmbh Crystal growth process control e.g. in the growth of germanium or silicon single crystals by the Czochralski method
US6126745A (en) * 1998-02-19 2000-10-03 Leybold Systems Gmbh Device for controlling crystal growth processes

Similar Documents

Publication Publication Date Title
GB1311558A (en) Growing crystals
GB1502528A (en) Electromagnetic compensation weighing apparatus
JPS6455089A (en) Method of controlling fan motor for air-conditioning machine
BE794885A (en) CONSTANT TORQUE CONTROL SYSTEM AND INERTIA COMPENSATION BY REGULATING THE ARMATURE CURRENT AND LOWERING THE EXCITATION OF A DIRECT CURRENT MOTOR
GB1457275A (en) Growth of crystalline material
US4032389A (en) Apparatus for automatically controlling crystal growth
DE69318973T2 (en) DEVICE FOR CORRECTING THE SWIVELING IN HYSTERESIS SYNCHRONOUS MOTORS
ES467928A1 (en) Method and an apparatus for controlling a crusher
GB1527834A (en) Photometry
US3955097A (en) Alternator driven by a vehicle engine
EP0293757B1 (en) Process and apparatus to determine a parameter for the transition region between crystal and melt
EP0040205A1 (en) Solenoid torquer system.
EP0088626A3 (en) Apparatus for controlling the speed of a rotating body
SU932402A1 (en) Asynchronous motor rotation speed determination method
JPS5527906A (en) Frequency-voltage convertor
SU903804A1 (en) Servoelectric drive
SU1004759A1 (en) Gyrocompass acceleration method
SU696532A1 (en) Tape-driving mechanism
HK142594A (en) Stepper motor control circuit, especially for watches
SU776101A1 (en) Device for automatic control of crystal diameter
SU979251A1 (en) Tension control
BG46007A3 (en) Method and installation for receiving crystal
JPS5680361A (en) Production apparatus of quenched thin strip
JPS5456124A (en) Torque controller for dc machine
SU1097441A1 (en) Method of controlling billet continuous casting machine mould swinging

Legal Events

Date Code Title Description
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Effective date: 19940721