GB1232523A - - Google Patents

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Publication number
GB1232523A
GB1232523A GB1232523DA GB1232523A GB 1232523 A GB1232523 A GB 1232523A GB 1232523D A GB1232523D A GB 1232523DA GB 1232523 A GB1232523 A GB 1232523A
Authority
GB
United Kingdom
Prior art keywords
mol
per cent
lab
july
earth metal
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
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 filed Critical
Publication of GB1232523A publication Critical patent/GB1232523A/en
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes
    • H01J9/042—Manufacture, activation of the emissive part
    • 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
    • H01J1/14—Solid thermionic cathodes characterised by the material
    • H01J1/148—Solid thermionic cathodes characterised by the material with compounds having metallic conductive properties, e.g. lanthanum boride, as an emissive material

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Solid Thermionic Cathode (AREA)

Abstract

1,232,523. Cathode materials. INSTITUT PO OBSHTA I NEORGANICHNA HIMIA. 16 July, 1969 [16 July, 1968], No. 35919/69. Heading C1A. [Also in Division H1] A cathode material comprises a solid solution of lanthanum hexaboride and an isomorphous alkaline earth metal hexaboride, the latter being present in a proportion of between 20 and 50 mol. per cent. The material is obtained by a solid-phase reaction in vacuum at a temperature of 1700-1800‹ C. between lanthanum oxide, an alkaline earth metal carbonate and elementary boron in the required proportions. Examples are given of compositions containing 40 mol. per cent SrB 6 and 60 mol. per cent LaB 6 and 40 mol. per cent BaB 6 and 60 mol. per cent LaB 6 .
GB1232523D 1968-07-16 1969-07-16 Expired GB1232523A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BG1032768 1968-07-16

Publications (1)

Publication Number Publication Date
GB1232523A true GB1232523A (en) 1971-05-19

Family

ID=3897315

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1232523D Expired GB1232523A (en) 1968-07-16 1969-07-16

Country Status (1)

Country Link
GB (1) GB1232523A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5051660A (en) * 1973-09-07 1975-05-08
JPS5074965A (en) * 1973-11-02 1975-06-19
JPS50118658A (en) * 1974-03-01 1975-09-17
US3932314A (en) * 1973-09-05 1976-01-13 Hitachi, Ltd. Hexaboride electron emissive material

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3932314A (en) * 1973-09-05 1976-01-13 Hitachi, Ltd. Hexaboride electron emissive material
JPS5051660A (en) * 1973-09-07 1975-05-08
JPS5074965A (en) * 1973-11-02 1975-06-19
JPS50118658A (en) * 1974-03-01 1975-09-17
JPS5441299B2 (en) * 1974-03-01 1979-12-07

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees