GB1469238A - Polarisation of ferroelectric ceramics - Google Patents

Polarisation of ferroelectric ceramics

Info

Publication number
GB1469238A
GB1469238A GB4118673A GB4118673A GB1469238A GB 1469238 A GB1469238 A GB 1469238A GB 4118673 A GB4118673 A GB 4118673A GB 4118673 A GB4118673 A GB 4118673A GB 1469238 A GB1469238 A GB 1469238A
Authority
GB
United Kingdom
Prior art keywords
pzt
substituted
voltage
ferroelectric
polarisation
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
GB4118673A
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 GB4118673A priority Critical patent/GB1469238A/en
Publication of GB1469238A publication Critical patent/GB1469238A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G7/00—Capacitors in which the capacitance is varied by non-mechanical means; Processes of their manufacture
    • H01G7/02—Electrets, i.e. having a permanently-polarised dielectric
    • H01G7/021—Electrets, i.e. having a permanently-polarised dielectric having an organic dielectric

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Inorganic Insulating Materials (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

1469238 Polarizing ferroelectric materials DEFENCE SECRETARY OF STATE FOR 6 Sept 1974 [31 Aug 1973] 41186/73 Heading C1J [Also in Division H1] A ferroelectric ceramic such as PZT or strontium-substituted PZT is polarized by first applying a voltage at a temperature within the range 100‹ to 200‹ C., which range is below the Curie point of the material, then applying a voltage at a lower temperature, e.g. between 25‹ and 50‹ C. A poling voltage of between 2À5 and 3À0 kv./mm. may be applied in both steps for about 5 minutes, and a time of about 30 minutes allowed to elapse between the steps. Particular ferroelectric ceramics referred to are K/Nb and Ag/Nb substituted PZT, and Ni, Bi and Cr substituted Sr substituted PZT.
GB4118673A 1974-09-06 1974-09-06 Polarisation of ferroelectric ceramics Expired GB1469238A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4118673A GB1469238A (en) 1974-09-06 1974-09-06 Polarisation of ferroelectric ceramics

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4118673A GB1469238A (en) 1974-09-06 1974-09-06 Polarisation of ferroelectric ceramics

Publications (1)

Publication Number Publication Date
GB1469238A true GB1469238A (en) 1977-04-06

Family

ID=10418495

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4118673A Expired GB1469238A (en) 1974-09-06 1974-09-06 Polarisation of ferroelectric ceramics

Country Status (1)

Country Link
GB (1) GB1469238A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3334091A1 (en) * 1982-09-22 1984-03-22 North American Philips Corp., 10017 New York, N.Y. METHOD FOR PRODUCING AN APODIZED ULTRASONIC TRANSDUCER

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3334091A1 (en) * 1982-09-22 1984-03-22 North American Philips Corp., 10017 New York, N.Y. METHOD FOR PRODUCING AN APODIZED ULTRASONIC TRANSDUCER

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee