Do you have any questions? Email Us [email protected]

LA1406 Lanthanum Hexaboride Cathode, Lab6 Cathode

Lanthanum Hexaboride Cathode Properties

Lanthanum Hexaboride Cathode

Compound Formula LaB6
Molecular Weight 203.78
Appearance Purple
Melting Point 2210 °C
Density 4.72 g/cm3
Solubility in H2O Insoluble
Crystal structure Cubic



Download Lanthanum Hexaboride SDS 


Lanthanum Hexaboride Cathode Description

Lanthanum Hexaboride, also called LaB6 cathode, is an inorganic chemical of rare earths. With melting point 2528 K, it is a refractory ceramic material, which is insoluble in water or hydrochloric acid and very stable in vacuum.

The unique properties of lanthanum hexaboride crystals provide stable electron emitting media with work functions near 2.70 eV. The low work function yields higher currents at lower cathode temperatures than tungsten, which means greater brightness, or current at the beam focus, and longer life. Typically, LaB6 cathodes exhibit 10 times the brightness and 50 times the service life of tungsten cathodes. In electron microscope applications, these characteristics translate to more beam current in a smaller spot at the sample, improved resolution, and less frequent cathode replacement.

Lanthanum Hexaboride Cathode Specifications

Product Lanthanum Hexaboride Structure Polycrystalline
Symbol LaB6 cathode Thermal Conductive 47 W/mK (20℃)
Cas No. 12008-21-8 Thermal Expansion  6.2 10-6K-1 (20-900℃)
Atomic Mass 203.78 g/mol Electrical Resistance ca.15 μΩ cm (20℃)
Density 4.72 g/cm3 Electrical Conductive 6.65×104  S/cm (20℃)
Melting Point 2528 K Current Denstiy 150 A/cm2 (1950℃)
Hardness 87.5 RA Electron Emissivity 2.6 eV
Flexure Strength (σ) 200 Mpa Fracture toughness (Kic) 3.0 MN/m3/2


Lanthanum Hexaboride Cathode Advantages

– Extended Life – Thousands of Hours in Clean Vacuum. Guaranteed Life (Measured in Surface Loss). Guaranteed Against Mounting Structure Failure.

– Exceptional Stability – Thermal/Chemical/Electrical. Precision Machined Carbon Mounting. High oprating temperature tolerance.

– High Brightness/Low Energy Spread – Oriented Single Crystal. Best-Quality/High-Purity Material.

– Accurate Microflats – Superior Optics/Controlled Source Size Standard Diameter Available.

Lanthanum Hexaboride Cathode Applications

-Thermionic emission (cathode)
-Plasma source for plasma enhanced coating(PECVD)
-Vacuum electron beam welding machine
-Electron beam surface reforming device
-Electron beam lithography device
-Transmission electron microscope
-Scanning electron microscope
-Surface analysis device
-Radio therapy devices

LaB6 Cathode VS. CeB6 Cathode

  CeB6 LaB6
Brightness (A/cm2-sr) 107 107
Short-term beam current stability % RMS < 1 < 1
Typical service life (hr) 1,500+ 1000+
Operating vacuum (torr) 10-7 10-7
Work function (eV) ~2.65 ~2.70
Evaporation rate (g/cm2-sec) 1.6 x 10-9 2.2 x 10-9


Packing Service

ACM’s high quality lanthanum hexaboride cathode is carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition.


  I would like to join the mailing list to receive updates from Advanced Ceramic Materials .

*: e-mail address with your company's domain name is preferred. Otherwise, we may not be able to process your inquiry.

Related Products

Submit your review

Create your own review
Lanthanum Hexaboride (LaB6) Cathode
Average rating:  
 1 reviews
by Paul A Phillips on Lanthanum Hexaboride (LaB6) Cathode
These are PERFECT for what I wanted!

I'm so happy I was able to find these lab6 cathodes at Advanced Ceramic Materials. And I love that I could get so many for such a great price. Five Stars and Recommended!