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Low-voltage field emission from tungsten fiber arrays in a stabilized zirconia matrix

Published online by Cambridge University Press:  31 January 2011

J. K. Cochran ,
A. T. Chapman ,
D. N. Hill  and
K. J. Lee
J. K. Cochran
Affiliation:
School of Materials Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245
A. T. Chapman
Affiliation:
School of Materials Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245
D. N. Hill
Affiliation:
School of Materials Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245
K. J. Lee
Affiliation:
School of Materials Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245
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Abstract

Field emitter array cathodes were fabricated from unidirectionally solidified composites of tungsten fibers in an insulating yttria-stabilized-zirconia (YSZ) matrix. A close-spaced molybdenum gate film (extractor) was formed utilizing c-beam evaporation of alumina as an insulator, which was overlayed by the molybdenum extractor. The high resistivity of the composite matrix coupled with the alumina insulator resulted in low leakage current and permitted dc operation of the device. Emission testing demonstrated current densities of 1–5 A/cm2 with leakage in the μA range for applied potentials of 125–200 V. Variation of emitter tip geometries from hemispheres to right circular cylinders to pointed cones produced increases in emission consistent with reduced tip radii.

Type
Articles
Information
Journal of Materials Research , Volume 2 , Issue 3 , June 1987 , pp. 322 - 328
Copyright
Copyright © Materials Research Society 1987

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References

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