CG MATERIAL
Cerium Hexaboride Sheet, CeB6 Sheet
Cerium Hexaboride Sheet, CeB6 Sheet
Cerium hexaboride sheet, also known as CeB6 sheet, is a type of ceramic material that is composed of cerium, boron, and carbon. It has a hexagonal crystal structure and is known for its exceptional electron emission properties, making it suitable for use in electron guns, cathodes, and other electronic devices.
CeB6 sheet is made by pressing and sintering cerium hexaboride powder at high temperatures and pressures. The resulting sheet has a high purity and density, with excellent mechanical and thermal properties. It is resistant to high temperatures and thermal shock, making it suitable for use in harsh environments.
CeB6 sheet can be used as a coating for various surfaces to improve their electron emission properties. It can also be machined into various shapes and sizes for use in electronic devices and other 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 Sheet 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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