GB1267817A - Improvements in or relating to crystal growing - Google Patents

Improvements in or relating to crystal growing

Info

Publication number
GB1267817A
GB1267817A GB40105/69A GB4010569A GB1267817A GB 1267817 A GB1267817 A GB 1267817A GB 40105/69 A GB40105/69 A GB 40105/69A GB 4010569 A GB4010569 A GB 4010569A GB 1267817 A GB1267817 A GB 1267817A
Authority
GB
United Kingdom
Prior art keywords
lead
per cent
ratio
flux
molar per
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
GB40105/69A
Inventor
Anthony George Wise
John Chadwick
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.)
Philips Components Ltd
Original Assignee
Mullard Ltd
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 Mullard Ltd filed Critical Mullard Ltd
Publication of GB1267817A publication Critical patent/GB1267817A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B35/00—Boron; Compounds thereof
    • C01B35/08—Compounds containing boron and nitrogen, phosphorus, oxygen, sulfur, selenium or tellurium
    • C01B35/10—Compounds containing boron and oxygen
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B35/00—Boron; Compounds thereof
    • C01B35/06—Boron halogen compounds
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B35/00—Boron; Compounds thereof
    • C01B35/08—Compounds containing boron and nitrogen, phosphorus, oxygen, sulfur, selenium or tellurium
    • C01B35/10—Compounds containing boron and oxygen
    • C01B35/12—Borates
    • 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
    • C30B29/10—Inorganic compounds or compositions
    • 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
    • C30B9/00—Single-crystal growth from melt solutions using molten solvents

Landscapes

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

Abstract

1,267,817. Ferric borate. MULLARD Ltd. 24 March, 1970 [26 March, 1969; 11 Aug., 1969], Nos. 15868/69 and 40105/69. Heading C1A. Single crystals of ferric borate (FeBO 2 ) are grown by preparing a flux melt including borate ions and one or both of lead fluoride and lead oxide such that the ratio [Pb]/([Pb]+ [B 2 O 3 ]) lies between 23 and 33 molar per cent and iron such that the ratio [Fe 2 O 3 ]/([Fe 2 O 3 ] + [Pb]) lies between 17À5 and 30 molar per cent, cooling the melt and separating the crystals therefrom. The preferred proportion of lead is between 25 and 33 molar per cent. The lead may be present as equimolar amounts of PbO and PbF 2 , when the ratio [Fe 2 O 3 ]/([Fe 2 O 3 ] + [Pb]) lies between 20 and 25 molar per cent. When the lead is present as PbO or PbF 2 the ratio [Fe 2 O 3 ]/([Fe 2 O 3 ]+[Pb]) may be 25 molar per cent. The flux may include a crystal growth habit modifying additive such as lead pyrophosphate, gallium oxide, and lanthanum oxide. The melt may also include a doping additive, e.g. Ti, V or Cr, which will have an effect on the magnetic properties of the resulting crystal. In a preferred embodiment a preliminary sintering of the flux components is carried out, the flux composition then sealed into a crucible, heated to 1150‹ C. for 24 hrs., rapidly cooled to 900‹ C., cooled at 1‹ C. per hour to 700‹ C., rapidly cooled to room temperature and then the crucible contents are leached out to retrieve the desired crystals.
GB40105/69A 1969-03-26 1969-03-26 Improvements in or relating to crystal growing Expired GB1267817A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1586869 1969-03-26

Publications (1)

Publication Number Publication Date
GB1267817A true GB1267817A (en) 1972-03-22

Family

ID=10066991

Family Applications (1)

Application Number Title Priority Date Filing Date
GB40105/69A Expired GB1267817A (en) 1969-03-26 1969-03-26 Improvements in or relating to crystal growing

Country Status (1)

Country Link
GB (1) GB1267817A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2616668C1 (en) * 2015-11-02 2017-04-18 Федеральное государственное автономное образовательное учреждение высшего образования "Крымский федеральный университет имени В.И. Вернадского" METHOD OF GROWING FeBO3 SINGLE-CRYSTAL FILM ON DIAMAGNETIC SUBSTRATE
CN110922166A (en) * 2019-11-08 2020-03-27 安徽大学 High-corrosion-resistance composite material and preparation method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2616668C1 (en) * 2015-11-02 2017-04-18 Федеральное государственное автономное образовательное учреждение высшего образования "Крымский федеральный университет имени В.И. Вернадского" METHOD OF GROWING FeBO3 SINGLE-CRYSTAL FILM ON DIAMAGNETIC SUBSTRATE
CN110922166A (en) * 2019-11-08 2020-03-27 安徽大学 High-corrosion-resistance composite material and preparation method thereof

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