Reasons for the Low Work-Function Value of Lanthanum Hexaboride Used as an Efficient Electron Emitter

Тваури, И.В.; Silaev, I. V.; Заалишвили, В.Б.; Ашхотов, О. Г.; Sozaev, Z. T.; Магкоев, Т. Т.

doi:10.1134/s1063785022040125

Cited by 2 publications

(1 citation statement)

References 8 publications

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“…Furthermore, foreign adsorbed atoms exert a significant effect on the work function. Research has shown that the low work function of LaB 6 results from the formation of a La-B dipole layer on the surface [9].…”

Section: Introductionmentioning

confidence: 99%

Modification of LaB6 with ZrO2-Al2O3-TiO2 for Improvement of Density and Mechanical and Electrical Properties

Yang,

Ba,

Hong

et al. 2024

Crystals

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Pure lanthanum hexaboride (LaB6) ceramics were prepared using powders of different grain sizes. The ceramics could reach a relative density of 98.2% at high temperatures and pressures, but had a low flexural strength (136.9 MPa). LaB6 ceramics were synthesized using ZrO2-Al2O3-TiO2 (ZAT) as sintering additives. The ceramics demonstrate high density and excellent mechanical properties. The hot pressure sintering (HPS) method was utilized in the synthesis of the ceramics. Investigations were conducted on the effects of ZAT content, as well as the effects of the sintering temperature and pressure on the sintering behavior, microstructure, and mechanical and electrical properties of LaB6 ceramics. LaB6 ceramics fabricated with a ZAT addition of 6 wt.%, at a sintering temperature of 1700 °C, and under a pressure of 50 MPa, exhibited superior sintering and electrical properties, including a relative density of 97%, a conductivity of 7.2 MS/m, a flexural strength of 281.5 MPa, and a Vickers hardness of 21.2 GPa. The LaB6 ceramics synthesized in this research exhibit promising potential as electron-emitting cathodes for field emission applications.

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Section: Introductionmentioning

confidence: 99%

Modification of LaB6 with ZrO2-Al2O3-TiO2 for Improvement of Density and Mechanical and Electrical Properties

Yang,

Ba,

Hong

et al. 2024

Crystals

View full text Add to dashboard Cite

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Boron trace amount measurement in LaB6 hollow cathode discharge using an improved actinometry method based on OES

Wang,

Meng,

Ning

et al. 2024

Phys. Scr.

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The erosion of hollow cathode critical structures is inevitable for the high-temperature and high-energy ion environment. As the amount of erosion product is very small in a short time, it is difficult to achieve online monitoring by traditional methods. This paper established an improved actinometry method based on optical emission spectroscopy (OES) to achieve online monitoring of the density of boron (B) erosion products from the lanthanum hexaboride (LaB6) cathode emitter without damaging the cathode structure. In this method, the intensity of spectral lines generated by the transitions of xenon (Xe) from its ground state and metastable state was collected. Then, the electron temperature can be calculated using the collisional radiative model of Xenon spectral lines. Further, the number density of B is obtained through the-ratio of spectral lines excited from the ground state of B and Xe, and thereby the rate of production of B erosion products from the emitter per unit time is determined. The erosion rate of the cathode under different operating conditions was measured. It was found that the erosion of the cathode emitter was closely related to the flowrate and low-frequency current oscillations of the cathode. Therefore, it is necessary to avoid low-frequency current oscillations and appropriately increase the gas flowrate of the cathode to improve the lifespan of the cathode emitter.

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Reasons for the Low Work-Function Value of Lanthanum Hexaboride Used as an Efficient Electron Emitter

Cited by 2 publications

References 8 publications

Modification of LaB6 with ZrO2-Al2O3-TiO2 for Improvement of Density and Mechanical and Electrical Properties

Modification of LaB6 with ZrO2-Al2O3-TiO2 for Improvement of Density and Mechanical and Electrical Properties

Boron trace amount measurement in LaB6 hollow cathode discharge using an improved actinometry method based on OES

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