GB482471A - Improvements in heating elements for thermionic cathodes - Google Patents

Improvements in heating elements for thermionic cathodes

Info

Publication number
GB482471A
GB482471A GB3398736A GB3398736A GB482471A GB 482471 A GB482471 A GB 482471A GB 3398736 A GB3398736 A GB 3398736A GB 3398736 A GB3398736 A GB 3398736A GB 482471 A GB482471 A GB 482471A
Authority
GB
United Kingdom
Prior art keywords
titanates
perowskite
heating elements
oxygen content
thermionic cathodes
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
GB3398736A
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.)
Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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 Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Priority to GB3398736A priority Critical patent/GB482471A/en
Publication of GB482471A publication Critical patent/GB482471A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/15—Cathodes heated directly by an electric current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
    • H01J1/22—Heaters

Landscapes

  • Inorganic Compounds Of Heavy Metals (AREA)

Abstract

Heating elements for thermionic cathodes are composed mainly or entirely of perowskite or of the titanates of strontium or barium having a crystal structure similar to that of perowskite, or a mixture of these titanates, the oxygen content of the titanates being less than the stoichiometric content which is in equilibrium with the atmosphere. The oxygen content may be so reduced by heating the titanate in a reducing gas, e.g. at 1500-1800 DEG C. for 30-60 minutes in hydrogen.ALSO:Heating elements for thermionic cathodes are composed mainly or entirely of perowskite or of the titanates of strontium or barium having a crystal structure similar to that of perowskite, or a mixture of these titanates, the oxygen content of the titanates being less than the stoichiometric content which is in equilibrium with the atmosphere. The oxygen content may be so reduced by heating the titanate in a reducing gas, e.g. at 1500-1800 DEG C. for 30-60 minutes in hydrogen. The titanates may be mixed with an insulating additive such as excess of oxide of the alkaline earth metal, this excess may amount to ,1 mol. of the oxide to 1 mol. of the titanate.
GB3398736A 1936-12-10 1936-12-10 Improvements in heating elements for thermionic cathodes Expired GB482471A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3398736A GB482471A (en) 1936-12-10 1936-12-10 Improvements in heating elements for thermionic cathodes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3398736A GB482471A (en) 1936-12-10 1936-12-10 Improvements in heating elements for thermionic cathodes

Publications (1)

Publication Number Publication Date
GB482471A true GB482471A (en) 1938-03-30

Family

ID=10359928

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3398736A Expired GB482471A (en) 1936-12-10 1936-12-10 Improvements in heating elements for thermionic cathodes

Country Status (1)

Country Link
GB (1) GB482471A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2480496A1 (en) * 1980-04-14 1981-10-16 Philips Nv CATHODE FOR ELECTRONIC TUBES COMPRISING TWO HOLLOW BODIES

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2480496A1 (en) * 1980-04-14 1981-10-16 Philips Nv CATHODE FOR ELECTRONIC TUBES COMPRISING TWO HOLLOW BODIES

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