Rare earth hexaboride electron-emitting material

Details Rare earth hexaboride electron-emitting material Rare earth hexaboride electron-emitting material

1998-06-26

2000-02-22

Kopec, Mark

Compositions

Electrically conductive or emissive compositions

Metal compound containing

2525211, 2525214, 313311, 313346R, H01B 106, H01J 105

Patent

active

060276703

ABSTRACT:
A rare earth hexaboride electron-emitting material of the formula ReB.sub.6+x, wherein Re is La, Ce or (La+Ce), and 0.05.ltoreq.x.ltoreq.0.20.

REFERENCES:
patent: 4030963 (1977-06-01), Gibson et al.
patent: 4999176 (1991-03-01), Iltis et al.
patent: 5238527 (1993-08-01), Otani et al.
patent: 5336362 (1994-08-01), Tanaka et al.
patent: 5690732 (1997-11-01), Otani et al.
Davis et al "Comparison of Thermionic Cathode Parameters of Low Index Single Crystal Faces of LaB.sub.6, CeB.sub.6 And PrB", Applied Surface Science 37, 1989, pp. 381-94.
Surface Science 107, L.W. Swanson, et al, "Crystallographic Dependence of the Work Function and Volatility of LaB.sub.6 ", pp. 263-289, 1981.
Journal of Physics E: Scientific Instruments 1975 vol. 8, E.D. Gibson et al, "The Preparation of Single Crystal LaB.sub.6 Cathodes for Electron Microscopes", pp. 1003-1004.
The Journal of Physical Chemistry, vol. 82, No. 1, 1978, Edmund Storms, et al, "Phase Relationship, Vaporization, and Thermodynamic Properties of the Lanthanum-Boron System", pp. 51-59.
Journal of Crystal Growth 118 (1992), Shigeki Otani, et al Preparation of LaB.sub.6 Single Crystals by the Traveling Colvent Floating Zone Method:, pp. 461-463.
Journal of Crystal Growth 126 (1993), Shigeki Otani, et al "Preparation of LaB.sub.6, Single Crystals from a Boron-Rich Molten Zone by the Floating Zone Method", pp. 466-470.
Journal of Materials Science 21 (1986), Paul R. Davis, et al "Fabrication and Characterization of Rare Earth Hexaboride Single-Crystal Materials", pp. 825-836.
Prog. Crystal Growth and Charact. 1988, vol. 16, pp. 1-18, Takaho Tanaka et al "A Survey on the Floating Zone Crystal growth of the Monocarbides of IVa, Va and VlaTransition Metals".

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