Product Code : CE-LaB6-6N-CA
Lanthanum Hexaboride Cathode(LaB6 cathode, also called lanthanum boride cathode and LaB6 cathode) is an inorganic chemical. With melting point 2528 K, LaB6 cathode is a refractory ceramic material, which is insoluble in water or hydrochloric acid and very stable in a vacuum. LaB6 cathode Stoichiometric samples are colored intense purple-violet, while boron-rich ones (above LaB6.07) are blue. Ion bombardment changes its color from purple to emerald green. LaB6 cathode is a superconductor with a relatively low transition temperature of 0.45 K.
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.
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Product Information
Lanthanum Hexaboride Cathode(LaB6 cathode, also called lanthanum boride cathode and LaB6 cathode) is an inorganic chemical. With melting point 2528 K, LaB6 cathode is a refractory ceramic material, which is insoluble in water or hydrochloric acid and very stable in a vacuum. LaB6 cathode Stoichiometric samples are colored intense purple-violet, while boron-rich ones (above LaB6.07) are blue. Ion bombardment changes its color from purple to emerald green. LaB6 cathode is a superconductor with a relatively low transition temperature of 0.45 K.
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.
Synonyms
Hexaborylidynelanthanum, lanthanum boride, LaB6, LaB，Lanthanum Boride/BO57-1N8/LanthanBoride/Boride De Lanthane/Boruro Del Lantano
LaB6 Cathode Specifications
Dimensions
Per your request or drawing
We can customized as required
Properties（Theoretical）
| Symbol | LaB6 |
| Purity | 99.9%/99%/98% |
| Cas No. | 12008-21-8 |
| Atomic Mass | 203.78 g/mol |
| Density | 4.72 g/cm3 |
| Melting Point | 2528 K |
| Hardness | 87.5 RA |
| Flexure Strength (σ) | 200 Mpa |
| Structure | Polycrystalline |
| Thermal Conductive | 47 W/mK (20℃) |
| Thermal Expansion | 6.2 10-6K-1 (20-900℃) |
| Electrical Resistance | ca.15 μΩ cm (20℃) |
| Electrical Conductivity | 6.65×104 S/cm (20℃) |
| Current Density | 150 A/cm2 (1950℃) |
| Current Density | 200 A/cm2 (1600℃) |
| Electron Emissivity | 2.6 eV |
| Electron Emissivity | < 4 eV |
| Fracture toughness (Kic) | 3.0 MN/m3/2 |
Chemical Composition
| LaB6 (% min.) | 99.9% |
| B(% min.) | 31% |
| Rare Earth Impurities | |
| Ce | <120ppm |
| Pr | <150ppm |
| Nd | <180ppm |
| Sm | <112ppm |
| Y | <250ppm |
| Non-RE Impurities | |
| Fe | <250ppm |
| Si | <100ppm |
| Ca | <90ppm |
| C | <300ppm |
| Mg | <100ppm |
| Ti | <100ppm |
| LaB6 (% min.) | 99.9 | 99 | 98 |
| B (% min.) | 31 | 31 | 31 |
| Impurities | % max. | % max. | % max. |
| Fe | 0.03 | 0.05 | 0.05 |
| Si | 0.015 | 0.03 | 0.03 |
| Ca | 0.03 | 0.05 | 0.05 |
| Co | 0.003 | 0.003 | 0.003 |
| Ni | 0.003 | 0.003 | 0.003 |
| Cu | 0.003 | 0.003 | 0.003 |
| W | 0.01 | 0.05 | 0.03 |
LaB6 Cathode vs. CeB6 Cathode
| Material | 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 |
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.
-Low work function (Electron emissivity)
-Good thermal shock resistance
-Good electrical conductivity
-Good chemical and oxidation resistance
Applications of Lanthanum Hexaboride Cathode
* 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
* Radiotherapy devices
Lanthanum hexaboride hollow cathode also called lanthanum boride hollow cathode and LaB6 hollow cathode has excellent performance such as high conductivity, good stability, and lower evaporation rate. It is usually used as the cathode material widely used in many fields of modern technology, such as plasma generators, rf ion sources, mass spectrometers, electronic micromirrors, and some electronics.
Packing of Lanthanum Boride
Standard Packing:
Sealed bags in carton boxes. Special package is available on request.
As a ceramic material, LaB6 is quite fragile in a lot of cases. The LaB6 cathode are usually held in plastic bags by vacuum, and protected with heavy foam.
ATTs’ LaB6 cathode is carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition.
Chemical Identifiers
| Linear Formula | LaB6 |
| MDL Number | MFCD00151350 |
| EC No. | 234-531-6 |
| Beilstein/Reaxys No. | N/A |
| Pubchem CID | 11947809 |
| IUPAC Name | boron; lanthanum |
| SMILES | [B].[B].[B].[B].[B].[B].[La] |
| InchI Identifier | InChI=1S/6B.La |
| InchI Key | OHYJFHAQNDIDQW-UHFFFAOYSA-N |
| CAS | 12008-21-8 |
