CG MATERIAL
Cerium Hexaboride Rod, CeB6 Rod
Cerium Hexaboride Rod, CeB6 Rod
Cerium hexaboride (CeB6) rod is a type of ceramic rod made from a rare earth metal cerium and boron. It has a unique combination of properties such as high melting point, high thermal conductivity, high electrical conductivity, and low work function. These properties make CeB6 rod a suitable material for various applications such as cathode ray tubes, electron microscopy, and high-temperature thermionic energy conversion devices.
CeB6 rod is made using a powder metallurgy technique where the powdered cerium hexaboride is first pressed into a desired shape and then sintered at a high temperature to form a solid ceramic rod. The final product has a high density, fine-grained microstructure, and excellent mechanical properties.
CeB6 rods are commonly used in electron microscopy applications as a cathode filament due to their high electron emission capabilities. They are also used in thermionic energy conversion devices where they act as a thermionic emitter due to their low work function. Furthermore, CeB6 rods find applications in high-temperature ceramic processing as a heating element due to their high melting point and thermal conductivity.
Overall, the unique combination of properties makes CeB6 rod a highly desirable material for a wide range of high-tech applications.
Cerium Hexaboride Description
Cerium Boride, also called Cerium Hexaboride or CeB6, is a refractory ceramic material. It has a low work function and one of the highest electron emissivity known, and is stable in a vacuum. Therefore, the principal use of cerium hexaboride is a coating of hot cathodes, or hot cathodes made of cerium hexaboride crystals. Cerium boride cathode usually operates at a temperature of 1450 °C because it shows a lower evaporation rate at 1427℃ than lanthanum boride, but it becomes equal at 1577℃ and higher above that.
Cerium Hexaboride Properties
| Compound Formula | CeB6 |
| Molecular Weight | 204.98 |
| Appearance | Blue |
| Melting Point | 2550 °C |
| Modulus of Elasticity | 379 GPa |
| Density | 4.80-4.87 g/cm3 |
| Thermal Conductivity | 33.0 – 34.8 W/m-K |
Cerium 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
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
|
|
| Pyrolytic block mount resistance @ 1800 K |
Ohms
|
1.45
|
|
Cerium Hexaboride Rod 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
Packaging
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