Title :
Studies on Tungsten-Rhenium mixed matrix cathodes
Author_Institution :
Central Electron. Eng. Res. Inst., Pilani
Abstract :
Studies are carried out on W-Re mixed matrix cathodes of varying compositions. The work function, when W & Re are in close proportions, is close to that of Re-coated cathode. The cathodes exhibited heating and decay effects at long pulses. AES in conjunction with SEM studies supported the presence of a thick active layer. The non-metallic behaviour is attributed to the presence of an appreciable amount of unreduced BaO. The resistance to Oxygen poisoning is better than that of a conventional B-Type cathode.
Keywords :
Auger electron spectra; cathodes; rhenium alloys; scanning electron microscopy; tungsten alloys; work function; AES; O poisoning resistance; SEM; W-Re; thick active layer; tungsten-rhenium mixed matrix cathodes; work function; Cathodes; Current density; Electrical resistance measurement; Heating; Oxygen; Powders; Pulse measurements; Scanning electron microscopy; Surface resistance; Tungsten; AES: Auger Electron Spectroscopy; THEM: Thermionic Emission Microscope; Tungsten-Rhenium mixed matrix cathodes (W-Re MM-cathodes); X-R D: X-ray diffraction;
Conference_Titel :
Vacuum Electronics Conference, 2008. IVEC 2008. IEEE International
Conference_Location :
Monterey, CA
Print_ISBN :
978-1-4244-1715-5
DOI :
10.1109/IVELEC.2008.4556405
