12CaO-7Al2O3 electride hollow cathode
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United States of America Patent
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Apr 5, 2016
Grant Date -
Dec 4, 2014
app pub date -
Apr 28, 2014
filing date -
Apr 26, 2013
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Abstract
The 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.
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