Lanthanum Hexaboride Cathode

Edgetech Industries, Advanced Ceramics Division supplies high-quality and competitive price advanced Lanthanum Hexaboride (LaB6) Cathode.


Lanthanum Hexaboride Cathode, LaB6 Cathode


Lanthanum Hexaboride (LaB6) cathodes usually show 10 times the brightness and 50 times the service life of tungsten cathodes. In electron microscopy applications, these characteristics can convert more electron beam currents on smaller spots of the sample, improve resolution, and reduce the frequency of cathode replacement.

The unique properties of lanthanum hexaboride crystals provide a stable electron emission medium with a work function close to 2.70 eV. The low work function produces a higher current at a lower cathode temperature than tungsten, which means greater brightness or current at the beam focus, and a longer LaB6 cathode life.

We provide LaB6 cathode with customized dimensions; regular purity is 99.5%.


Lanthanum Hexaboride Material Specifications


ProductLanthanum HexaborideStructurePolycrystalline
SymbolLaB6Thermal Conductive47 W/mK (20℃)
Cas No.12008-21-8Thermal Expansion 6.2 10-6K-1 (20-900℃)
Atomic Mass203.78 g/molElectrical Resistanceca.15 μΩ cm (20℃)
Density4.72 g/cm3Electrical Conductivity6.65×104 S/cm (20℃)
Melting Point2528 KCurrent Density150 A/cm2 (1950℃)
Hardness87.5 RAElectron Emissivity2.6 eV
Flexure Strength (σ)200 MpaFracture toughness (Kic)3.0 MN/m3/2


Lanthanum Hexaboride Cathode Advantages


-Extend life

Clean thousands of hs in a vacuum. Guaranteed life (in units of surface loss). Ensure that there will be no installation structural failures.

-Excellent stability

Thermal / Chemical / Electrical. Precision-machined carbon fiber installation. High-temperature resistance.

-High brightness / low energy consumption

Oriented single crystal. Best quality / high purity material.

-Precise miniature shoes

Provide excellent optical components / controlled light source size standard diameter.


LaB6 Cathode vs. CeB6 Cathode


Brightness (A/cm2-sr)107107
Short-term beam current stability % RMS<1<1
Typical service life (hr)1,500+1000+
Operating vacuum (torr)10-710-7
Work function (eV)~2.65~2.70
Evaporation rate (g/cm2-sec)1.6 x 10-92.2 x 10-9


Packing of Lanthanum Boride


Lanthanum Hexaboride Cathode is carefully handled to minimize damage during storage and transportation and preserve the quality of products in their original condition. Vacuum packing is used for some ceramic parts.


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