CG MATERIAL
Lanthanum Hexaboride Cathode, Lab6 Cathode
Lanthanum Hexaboride Cathode, Lab6 Cathode
Lanthanum hexaboride (LaB6) cathodes are a type of electron emitter used in electron microscopes, X-ray generators, and other vacuum electronics applications. LaB6 cathodes are known for their high brightness, long lifetime, and low work function, which makes them highly efficient at emitting electrons.
LaB6 cathodes are made by pressing and sintering LaB6 powder into a cylindrical shape, which is then mounted into a cathode assembly. The LaB6 material is highly refractory, with a melting point of over 2500°C, and is resistant to oxidation and chemical attack.
LaB6 cathodes can be operated at high temperatures, up to 1900°C, and at high current densities, making them suitable for demanding applications such as electron beam lithography and materials analysis. They are also used in scanning electron microscopes (SEMs) and transmission electron microscopes (TEMs) due to their high brightness and low energy spread, which results in improved resolution and image quality.
Lanthanum Hexaboride Properties
| Compound Formula | LaB6 |
| Molecular Weight | 203.78 |
| Appearance | Purple to Violet |
| Melting Point | 2210 °C |
| Density | 2.61 g/cm3 |
Lanthanum Hexaboride 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
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 Density | 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 uprating temperature tolerance.
– High Brightness/Low Energy Spread – Oriented Single Crystal. Best-Quality/High-Purity Material.
– Accurate Microflects – 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 |
Packaging
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