LA1408 Lanthanum Hexaboride (LaB6) Ceramic Part
Lanthanum Hexaboride Ceramic Part Properties
| Catalog No. | CE1850 |
|---|---|
| Density | 4.8g/cm3 |
| Melting Point | 2552℃ |
| Molecular Formula | CeB6 |
| Crystal Structure | Cubic |
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Lanthanum Hexaboride Ceramic Part Description
Lanthanum Hexaboride, also called LaB6 cathode, is an inorganic chemical of rare earths. With melting point 2528 K, LaB6 cathode 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 LaB6 cathode 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 Ceramic Part Specification
|
Product |
Lanthanum Hexaboride |
Structure |
Polycrystalline |
|
Symbol |
LaB6 |
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 |
Currenty 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 Chemical Composition
|
LaB6 (% min.) |
|||
|
99.9% |
|||
|
B(% min.) |
|||
|
31% |
|||
|
Rare Earth Impurities |
Non-RE Impurities |
||
|
Ce |
<120ppm> |
Fe |
<250ppm> |
|
Pr |
<150ppm> |
Si |
<100ppm> |
|
Nd |
<180ppm> |
Ca |
<90ppm> |
|
Sm |
<112ppm> |
C |
<300ppm> |
|
Y |
<250ppm> |
Mg |
<100ppm> |
|
|
|
Ti |
<100ppm> |
Lanthanum Hexaboride Ceramic Part 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
Material Data for LaB6 and CeB6
|
Parameter
|
Units | LaB6 | CeB6 |
|---|---|---|---|
| Stoichiometry |
N/A
|
~6
|
|
| Metal Impurities |
ppm by wt.
|
<30>
|
|
| Density |
g/cm3
|
4.72
|
4.80
|
| Coefficient of Thermal Expansion |
α x 106
|
5.6
|
6.2
|
| Electrical Resistivity |
µΩ-cm
|
~50
|
~65
|
| Effective Work Function (100) at 1800 K |
eV
|
2.70
|
2.65
|
| Spectral Emissivity at 0.65 microns |
N/A
|
0.765
|
0.779
|
| Evaporation rate at 1800 K (UHV) |
g/cm2/s
|
2.2 x 10-9
|
1.6 x 10-9
|
| Orientation limit for specific orientation |
degrees
|
<2>
|
|
| Pyrolitic block mount resistance @ 1800 K |
Ohms
|
1.45
|
|
Packing Service
ACM’s Lanthanum Hexaboride Ceramic Part is carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition.
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