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12CaO-7Al2O3 Electride Hollow CathodeThe use of the electride form of 12CaO-7Al2O3, or C12A7, as a low work function electron emitter in a hollow cathode discharge apparatus is described. No heater is required to initiate operation of the present cathode, as is necessary for traditional hollow cathode devices. Because C12A7 has a fully oxidized lattice structure, exposure to oxygen does not degrade the electride. The electride was surrounded by a graphite liner since it was found that the C12A7 electride converts to it's eutectic (CA+C3A) form when heated (through natural hollow cathode operation) in a metal tube.
Document ID
20170001264
Acquisition Source
Goddard Space Flight Center
Document Type
Other - Patent
Authors
Rand, Lauren P.
Williams, John D.
Martinez, Rafael A.
Date Acquired
February 3, 2017
Publication Date
January 24, 2017
Subject Category
Electronics And Electrical Engineering
Funding Number(s)
CONTRACT_GRANT: NNG05GH75H
CONTRACT_GRANT: NNX11CD35P
CONTRACT_GRANT: FA9300-06-C-0023
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-Patent-9,552,952
Patent Application
US-Patent-Appl-SN-15/091,433

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