GB1069035A - Improvements in or relating to methods of preparing multi-stable ferrite materials - Google Patents

Improvements in or relating to methods of preparing multi-stable ferrite materials

Info

Publication number
GB1069035A
GB1069035A GB1704365A GB1704365A GB1069035A GB 1069035 A GB1069035 A GB 1069035A GB 1704365 A GB1704365 A GB 1704365A GB 1704365 A GB1704365 A GB 1704365A GB 1069035 A GB1069035 A GB 1069035A
Authority
GB
United Kingdom
Prior art keywords
stable
ferrite
toroid
april
firing
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
GB1704365A
Inventor
Raymond Malcolm Glaister
Eric Walter Lee
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 GB1704365A priority Critical patent/GB1069035A/en
Priority to NL6605231A priority patent/NL6605231A/xx
Priority to FR58644A priority patent/FR1477110A/en
Publication of GB1069035A publication Critical patent/GB1069035A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/45—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of non-linear magnetic or dielectric devices
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
    • C04B35/2666—Other ferrites containing nickel, copper or cobalt

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

1,069,035. Magnetic structures. STANDARD TELEPHONE & CABLES Ltd. April 15, 1966 [April 22, 1965], No. 17043/65. Heading H1H. A ferrite having at least 3 stable states o<SP>f</SP> magnetization is produced by inducing in a bi-stable ferrite a magnetic condition intermediate between the two fully switched conditions, and subjecting it to a heat treatment to introduce a stable state corresponding to the intermediate condition. The initial ferrite, preferably CO x Fe<SP>2+</SP> 1-x Fe 2 O 4 , where x is 0À025- 0À2, may be prepared by milling the constituents, pre-firing, re-milling, pressing into toroids, firing in CO 2 at 1350‹ C., annealing at 200‹ C. in an alternating field of frequency 50 c./sec., and magnitude first 100 oe. then 25 oe., and cooling in the field. The toroid is then pulsed (starting at remenance) until partial switching occurs, and in this state is heated at 70-250‹ C. The toroid may have a zone of reduced thickness (see Fig. 4). The stable states correspond to horizontal peaks in the hysteresis curve (see Figs. 5 and 6b).
GB1704365A 1965-04-22 1965-04-22 Improvements in or relating to methods of preparing multi-stable ferrite materials Expired GB1069035A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB1704365A GB1069035A (en) 1965-04-22 1965-04-22 Improvements in or relating to methods of preparing multi-stable ferrite materials
NL6605231A NL6605231A (en) 1965-04-22 1966-04-19
FR58644A FR1477110A (en) 1965-04-22 1966-04-22 Improvements in manufacturing methods for multistable magnetic devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1704365A GB1069035A (en) 1965-04-22 1965-04-22 Improvements in or relating to methods of preparing multi-stable ferrite materials

Publications (1)

Publication Number Publication Date
GB1069035A true GB1069035A (en) 1967-05-17

Family

ID=10088230

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1704365A Expired GB1069035A (en) 1965-04-22 1965-04-22 Improvements in or relating to methods of preparing multi-stable ferrite materials

Country Status (2)

Country Link
GB (1) GB1069035A (en)
NL (1) NL6605231A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118213180A (en) * 2024-04-28 2024-06-18 香磁磁业(深圳)有限公司 Sintered ferrite preparation process and sintered ferrite magnet

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118213180A (en) * 2024-04-28 2024-06-18 香磁磁业(深圳)有限公司 Sintered ferrite preparation process and sintered ferrite magnet

Also Published As

Publication number Publication date
NL6605231A (en) 1966-10-24

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