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Hexaboride-electron-emissive-material

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Hexaboride electron emissive material

Details

Inventors: Kawabe, Ushio; Yamamoto, Shigehiko; Aita, Toshiyuki; Honda, Yukio;
Assignee: Hitachi, Ltd. (JA)
Primary Examiner: Padgett; Benjamin R.
Assistant Examiner: Parr; E. Suzanne
Attorney, Agent or Firm: Craig & Antonelli

An electron emissive material of the formula (Y.sub.1.sub.-x EU.sub.x)B.sub.6 having the calcium hexaboride type crystal structure can easily produce hexaborides of the single phase. These borides have a number of merits such as small work function, high mechanical properties and low vapor pressure, and they are far more excellent than prior-art materials when used in a thermionic emission cathode and a field emission type cold cathode.

DETAILED DESCRIPTION An object of this invention is to provide a stable and long-life electron emissive material which has a low work function, which can be readily manufactured as a stable single phase compound and which establishes a high electronic current density.
In order to accomplish the object, this invention substitutes europium (Eu) for part of yttrium (Y) in yttrium hexaboride (YB.
sub.
6).

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