Emission properties of Re-W dispenser cathodes

Author

Taran, A. ; Plankovskyy, S. ; Voronovich, D. ; Abashin, S.

Author_Institution

Nat. Aerosp. Univ. Kharkiv Aviation Inst., Kharkiv, Ukraine

fYear

2009

fDate

28-30 April 2009

Firstpage

407

Lastpage

408

Abstract

The technique for producing impregnated cathodes with a Re-W ldquospongerdquo matrix (75%-Re/25%-W mass ratio) and 3BaOmiddot0.5CaOmiddotAl₂O₃ as the emissive active substance has been developed. The emission properties of such cathodes with normal impregnation and of one with excess of emissive active substance have been studied. The cathodes with the normal impregnation have higher emission properties in comparison with the cathodes with the tungsten sponge. The cathodes with a Re-W matrix and excess of impregnant are characterized by anomalous Schottky effect, BaReO₄ and BaWO₄ needlelike nanostructures formation.

Keywords

Schottky effect; aluminium compounds; barium compounds; calcium compounds; cathodes; rhenium; tungsten; BaO-CaO-Al₂O₃; BaReO₄; BaWO₄; Re-W; Re-W sponge matrix; Schottky effect; dispenser cathodes; emission properties; emissive active substance; impregnated cathodes; Barium; Calcium; Cathodes; Current density; Nanostructures; Powders; Temperature; Testing; Thermionic emission; Tungsten; Re-W matrix; impregnant; ispenser cathode; thermionic emission;

fLanguage

English

Publisher

ieee

Conference_Titel

Vacuum Electronics Conference, 2009. IVEC '09. IEEE International

Conference_Location

Rome

Print_ISBN

978-1-4244-3500-5

Electronic_ISBN

978-1-4244-3501-2

Type

conf

DOI

10.1109/IVELEC.2009.5193581

Filename

5193581