Cathode for a cathode ray tube.

摘要

A cathode for use in electron tubes which comprises a base metal (1) made of nickel as a principal component and having a surface on which a porous electron emissive layer (30) is formed. The porous electron emissive layer is of a composition comprising 0.1 to 20 wt% (relative to the total weight of the porous electron emissive layer) of scandium oxide having a layered crystalline structure dispersed in an oxide of alkaline earth metal including at least barium. This cathode can be made by preparing a solution in which nitrocellulose is dissolved with the use of an organic solvent, mixing both of barium carbonate and scandium oxide having a layered crystalline structure into the solution to provide a suspension, pulverizing solid components of the suspension for the adjustment of particle size, and depositing the suspension on a surface of the base metal to form the electron emissive layer.