LaB6 ceramic and cathodes

Diverse possibilities

Properties of lanthanum hexaboride (LaB6)

  • Very low work function (electron emissivity)
  • very good thermal shock resistance
  • very good electrical conductivity
  • good chemical and oxidation resistance


  • electron source
  • thermal cathode or hot cathode
  • electrically conductive ceramic
  • plasma source for plasma-supported coatings (PECVD)
Lanthanum hexaboride (LaB6) has a melting point of greater than 2400°C, a cubic crystalline structure and an extremely low electron work function of just 2.7eV. For this reason, LaB6 ceramic is used globally as a cathode in plasma-supported coating processes. We produce these cathodes with different geometries for a vast number of industrial and university applications.
Structure polycrystalline
Thermal conductivity W/mK 47 (20 °C)
Thermal expansion 10-6K-1 6.2 (20 - 900 °C)
Density g/cm3 4.72  
Melting point K 2528  
Spec. electrical resistance μΩ cm ca. 15 (20 °C)
Electrical conductivity S/cm 6.65 x 104 (20 °C)
current density am Tmax A/cm2 150 (1950 °C)
Electron emissivity eV < 4  

Our comprehensive technical and material knowledge and the specially developed production processes open up diverse possibilities of

  • many years of experience as a manufacturer of LaB6
  • as free a shaping as possible, even complex geometries
  • individual pieces as well as batch production
  • technical consulting in all questions of form and application

We produce cathodes according to your wishes

  • Pipes
  • rings
  • plates
  • according to your drawings


z.B.  LaB6, CaB6, CeB6, EuB6
We produce hexaboride ceramics from the series of lanthanides such as LaB6, CeB6, EuB6 and the alkaline earth metals such as CaB6 for applications in plasma technology and for research.
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