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Related Experiment Video

Updated: Mar 2, 2026

Processing of Bulk Nanocrystalline Metals at the US Army Research Laboratory

Processing of Bulk Nanocrystalline Metals at the US Army Research Laboratory

Published on: March 7, 2018

Work function characterization of directionally solidified LaB₆-VB₂ eutectic.

Tyson C Back¹, Andreas K Schmid², Steven B Fairchild³

¹University of Dayton Research Institute, 300 College Park, Dayton, OH 45469-0170, USA; Air Force Research Laboratory, Materials and Manufacturing Directorate, 3005 Hobson Way, Wright-Patterson Air Force Base, OH 45433, USA.

Ultramicroscopy

|May 20, 2017

Summary

This summary is machine-generated.

The LaB₆/VB₂ system shows promise for thermionic emitters. Vanadium deposition significantly lowers the work function, enhancing emission intensity for potential device applications.

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Area of Science:

Materials Science
Surface Science
Condensed Matter Physics

Background:

Lanthanum hexaboride (LaB₆) and Vanadium Diboride (VB₂) eutectic systems offer a unique combination of low work function and high mechanical strength.
These properties make them attractive for high-performance thermionic emitter applications.

Purpose of the Study:

To investigate the work function's origin, value, and distribution in the LaB₆/VB₂ system.
To understand the physical and chemical factors influencing the work function of these surfaces.

Main Methods:

Combined use of thermal emission electron microscopy (TEEM) and low energy electron microscopy (LEEM).
Auger electron spectroscopy (AES) for chemical analysis.
Physical vapor deposition (PVD) for controlled elemental deposition.

Main Results:

Observed lower work function and higher emission intensity on VB₂ inclusions compared to the LaB₆ matrix.
Demonstrated a significant work function reduction (down to 1.1 eV) upon deposition of atomic monolayer doses of vanadium.

Conclusions:

The spatial distribution of VB₂ significantly impacts the work function of the LaB₆/VB₂ system.
Vanadium surface modification is a promising strategy for achieving ultra-low work functions in thermionic emitters.