Lanthanum Hexaboride Single Crystal Cathodes

Lanthanum Hexaboride Single Crystal Cathodes


Please see Description Tab below for more details.

XX*, XXX*: Custom options for microflat dimension available.

Part #: - Categories: ,
Model #: lanthanum-hexaboride-cathodes-single-crystal


The Kimball Physics ES-423E (Extended Life) Lanthanum Hexaboride (LaB6) Cathode is a high performance, resistively heated, thermionic electron source. It is currently employed in many brightness-limited electron optical systems: SEM’s, TEM’s, probes, electron lithography systems, and more. It is based on a well-proven heater structure, which has recently been further refined with features that include improved reliability of the heater circuit, improved stability of the LaB6 crystal, and less exposure of LaB6 to reduce Wehnelt aperture contamination. Lifetimes in excess of 6 months of continuous operation are regularly achieved in commercial SEM’s and TEM’s with suitable gun vacuum. Continuous operation at the full operating temperature improves the thermal stability of the gun and hence beam current stability.


  • Scanning Electron Microscopes
  • Transmission Electron Microscopes
  • Electron Lithography Systems
  • Electron Accelerators
  • X-ray Sources
  • Free Electron Lasers
  • Custom Applications


Features / Options:

  • Extended Lifetime
    • Thousands of functional hours in
      clean vacuum
    • Guaranteed Against Structural
      Mounting Failure
  • Exceptional Stability
    • Precision machined carbon mounting
    • High over-temperature tolerance
  • High Brightness / Low Energy Spread
    • <100> Oriented Single Crystal
    • Best Quality / High Purity Material
    • Emission current densities up to 30 A/cm2
    • Operating pressure < 10-7 torr
  • Accurate Microflats
    • Superior Optics
    • Controlled Source Size
    • Standard Diameters Available
    • Range of emission surface sizes
    • Custom sizes available
  • On AEI base, compact CB-104 base or request custom mounting

For More Information, please refer to the Resources Tab (above) on this page to access additional detailed content.

Additional information

Weight 0.55 lbs
Cathode style

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Cathode base