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Element

Thermionic Work Function

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Barium

2.11 eV

Cadmium

4.07 eV

Calcium

2.24 eV

Carbon

4.34 eV

Cerium

2.6 eV 

Cesium

1.81 eV

Chromium

4.60 eV

Cobalt

4.40 eV

Copper

4.26 eV

Gallium

4.12 eV

Gold

4.32 eV

Hafnium

3.53 eV

Iridium

5.3 eV 

Iron

4.25 eV

Lanthanum

3.3 eV 

Manganese

3.83 eV

Molybdenum

4.20 eV

Neodymium

3.3 eV 

Nickel

5.03 eV

Niobium

4.01 eV

Palladium

4.99 eV

Platinum

5.32 eV

Praseodymium

2.7 eV 

Rhenium

5.1 eV 

Rhodium

4.80 eV

Samarium

3.2 eV 

Silicon

3.59 eV

Silver

3.56 eV

Tantalum

4.19 eV

Thorium

3.35 eV

Titanium

3.95 eV

Tungsten

4.52 eV

Uranium

3.27 eV

Vanadium

4.12 eV

Zirconium

4.21 eV

Reference    (Click the button next to a value above to see complete citation information for that entry)

Mechtly, Eugene A. "Properties of Materials." pp. 4–1 to 4–33 in Reference Data For Engineers: Radio, Electronics, Computer, and Communications. By Mac E. Van Valkenburg, edited by Wendy M. Middleton. Woburn, MA: Butterworth-Heinemann, 2002. doi:10.1016/B978-075067291-7/50006-6