Applications of Scandium Oxide in Dispenser Thermionic Cathodes

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Jinshu Wang
Beijing University of Technology, Beijing, China

Series: Chemistry Research and Applications
BISAC: SCI013000

The addition of scandium oxide to dispenser cathodes, which are typically comprised of a porous tungsten matrix impregnated with Ba-Ca-aluminates, improves the emission by a factor of tens to hundreds under the same operating temperature. This new book reviews the fabrication, emission property and emission mechanism of Scandate cathodes. The traditional impregnated Scandate cathode, “top-layer” impregnated Scandate cathode, impregnated mixed matrix Scandate cathode and pressed Scandate cathode were each summarized. It was found that decreasing the grain size from micrometer to sub-micrometer could enhance the cathode emission performance. (Imprint: Nova)

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Table of Contents

ABSTRACT

1. INTRODUCTION

2. THE TYPE OF SCANDATE CATHODE

3. CHARACTERIZATION OF SCANDIUM AND ITS ROLE IN THE EMISSION

4. SURFACE STRUCTURE OF SCANDATE CATHODES

5. SUMMARY

ACKNOWLEDGEMENT

REFERENCES

INDEX

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