Dispenser cathode life prediction model

Longo, R. T.; Adler, E. A.; Falce, Lou

doi:10.1109/iedm.1984.190712

Cited by 32 publications

(7 citation statements)

References 2 publications

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“…4c). The modified G-L model also requires reconciliation of different experimental values such as atomic surface densities 16,36,37,38 . In addition, the nature of the polynomial fit in the modified G-L model results in nonphysical deviations at coverages above 1 ML (Fig.…”

Section: Resultsmentioning

confidence: 99%

An orbital-overlap model for minimal work functions of cesiated metal surfaces

Chou

Voss

Bargatin

et al. 2012

J. Phys.: Condens. Matter

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We introduce a model for the effect of cesium adsorbates on the work function of transition metal surfaces. The model builds on the classical point-dipole equation by adding exponential terms that characterize the degree of orbital overlap between the 6s states of neighboring cesium adsorbates and its effect on the strength and orientation of electric dipoles along the adsorbate-substrate interface. The new model improves upon earlier models in terms of agreement with the work function-coverage curves obtained via first-principles calculations based on density functional theory (DFT). All the cesiated metal surfaces have optimal coverages between 0.6 to 0.8 monolayers (ML), in accordance with experimental data. All the cesiated tungsten surfaces we have considered are shown to have minimum work functions (MWF) lower than most cesiated metals, also in accordance with experiments.

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Section: Resultsmentioning

confidence: 99%

An orbital-overlap model for minimal work functions of cesiated metal surfaces

Chou

Voss

Bargatin

et al. 2012

J. Phys.: Condens. Matter

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“…A modified GL model was devised by Jensen et al [35] to incorporate empirical parameters such as covalent radii, although the fit tends to overestimate the work function ( figure 4(c)). The modified GL model also requires reconciliation of different experimental values such as atomic surface densities [16,[36][37][38]. In addition, the nature of the polynomial fit in the modified GL model results in nonphysical deviations at coverages above 1 ML (figure 4(c)).…”

Section: Resultsmentioning

confidence: 99%

Structural and Electrical Anomalies of Ba₂YCu₃O_7-y at the Oxygen Stoichiometry of 6.48

Ono¹,

Kobayashi²,

Nozaki³

et al. 1988

Jpn. J. Appl. Phys.

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We introduce a model for the effect of cesium adsorbates on the work function of transition metal surfaces. The model builds on the classical point-dipole equation by adding exponential terms that characterize the degree of orbital overlap between the 6s states of neighboring cesium adsorbates and its effect on the strength and orientation of electric dipoles along the adsorbate-substrate interface. The new model improves upon earlier models in terms of agreement with the work function-coverage curves obtained via first-principles calculations based on density functional theory. All the cesiated metal surfaces have optimal coverages between 0.6 and 0.8 monolayers, in accordance with experimental data. Of all the cesiated metal surfaces that we have considered, tungsten has the lowest minimum work function, also in accordance with experiments.

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“…If more than a monolayer of barium is present, the excess rapidly evaporates. Longo et al determined that the work function is dependent on the monolayer coverage of barium and that the minimum work function occurs at a value of less than full coverage [19]. They developed predictive equations for lifetime based on empirical data that accurately predicted the variation in emission with time and temperature.…”

Section: A Work Function Stability and Lifetimementioning

confidence: 98%

Controlled-Porosity Cathodes for High-Current-Density Applications

Ives

Falce²,

Miram

et al. 2010

IEEE Trans. Plasma Sci.

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Controlled-porosity reservoir cathodes that can operate at high current densities with long lifetimes are described. The fabrication process is economical and adaptable to high volume production. The cathodes exhibit superior performance over sintered powdered tungsten cathodes. This paper describes the fabrication, presents measured performance, and compares the results with conventional dispenser cathodes.

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Dispenser cathode life prediction model

Cited by 32 publications

References 2 publications

An orbital-overlap model for minimal work functions of cesiated metal surfaces

An orbital-overlap model for minimal work functions of cesiated metal surfaces

Structural and Electrical Anomalies of Ba₂YCu₃O_7-y at the Oxygen Stoichiometry of 6.48

Controlled-Porosity Cathodes for High-Current-Density Applications

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Dispenser cathode life prediction model

Cited by 32 publications

References 2 publications

An orbital-overlap model for minimal work functions of cesiated metal surfaces

An orbital-overlap model for minimal work functions of cesiated metal surfaces

Structural and Electrical Anomalies of Ba2YCu3O7-y at the Oxygen Stoichiometry of 6.48

Controlled-Porosity Cathodes for High-Current-Density Applications

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Structural and Electrical Anomalies of Ba₂YCu₃O_7-y at the Oxygen Stoichiometry of 6.48