Improved cataphoretic deposition methods for lanthanum hexaboride

Abstract

The cataphoretic deposition method for preparing lanthanum hexaboride coatings has been modified to permit the preparation of several different types of surfaces. Some of these surfaces had good adhesion to the substrate, overcoming a major drawback to earlier methods. The surfaces ranged from smooth and dense, which were excellent electron emitters but poor halide ion producers, to porous, which were excellent halide ion producers.