GB1341368A - Treatment of barium titanate ceramics - Google Patents

Treatment of barium titanate ceramics

Info

Publication number
GB1341368A
GB1341368A GB1341368DA GB1341368A GB 1341368 A GB1341368 A GB 1341368A GB 1341368D A GB1341368D A GB 1341368DA GB 1341368 A GB1341368 A GB 1341368A
Authority
GB
United Kingdom
Prior art keywords
heating
barium titanate
oxidizing atmosphere
temperature coefficient
barium
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
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Publication of GB1341368A publication Critical patent/GB1341368A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • C04B35/46—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 titanium oxides or titanates
    • C04B35/462—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 titanium oxides or titanates based on titanates
    • C04B35/465—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 titanium oxides or titanates based on titanates based on alkaline earth metal titanates
    • C04B35/468—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 titanium oxides or titanates based on titanates based on alkaline earth metal titanates based on barium titanates
    • C04B35/4682—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 titanium oxides or titanates based on titanates based on alkaline earth metal titanates based on barium titanates based on BaTiO3 perovskite phase
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/02—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having positive temperature coefficient
    • H01C7/022—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having positive temperature coefficient mainly consisting of non-metallic substances
    • H01C7/023—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having positive temperature coefficient mainly consisting of non-metallic substances containing oxides or oxidic compounds, e.g. ferrites
    • H01C7/025—Perovskites, e.g. titanates

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Thermistors And Varistors (AREA)

Abstract

1341368 Positive temperature coefficient resistors MATSUSHITA ELECTRIC INDUSTRIAL CO Ltd 20 June 1972 28758/72 Heading H1K The positive temperature coefficient of resistance of a barium titanate based ceramic is increased by coating it with a silver compound and/or a lithium compound, which is the oxide or is convertible to it by heating above 700‹ C. in an oxidizing atmosphere, and then heating in an oxidizing atmosphere at from 700‹-1200‹ C. The titanate, which includes niobium, bismuth, antimony or a rare earth element such as lanthanum to provide the positive coefficient may have its Curie point adjusted by substitution of lead and tin for part of the barium and titanium respectively. The lithium and silver compounds, examples of which are given, may be applied in the molten form, as a paste or solution, or as a powder, any excess being removed after the heating is completed. Various examples are described in details.
GB1341368D 1972-06-20 1972-06-20 Treatment of barium titanate ceramics Expired GB1341368A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2875872 1972-06-20

Publications (1)

Publication Number Publication Date
GB1341368A true GB1341368A (en) 1973-12-19

Family

ID=10280669

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1341368D Expired GB1341368A (en) 1972-06-20 1972-06-20 Treatment of barium titanate ceramics

Country Status (1)

Country Link
GB (1) GB1341368A (en)

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
PE20 Patent expired after termination of 20 years