High-Temperature Observation of Nickel Cathode by Using Muller-Type Microscope

概要

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By using Muller-type microscope having an ordinary pumping system, emission patterns of nickel single crystal activated by magnesium were observed at high temperatures. As the results, it was found that crystal faces of nickel were divided into two groups. namely, a group of faces, such as (320) face, whose emission appeared in the early stage of activation and monotonously increased with rising temperature, and another group of faces, such as (211) face, whose emission appeared after prolonged activation treatment and had a maximum value at certain temperature. Also it was found that, in each group, the smaller the work function of the crystal face, the looser their atomic packing was. The cause that crystal faces should be divided into two groups was discussed. Finally, the cathode at high temperature was quenched to room temperature with applying anode voltage. As the result, it was found that, with the progress of activation, the pattern similar to that appearing at high temperature could be obtained at room temperature and also the time elapsed until disappearance of the pattern at room temperature became longer.
東北大学の論文