Brief information:
Features of Cerium Boride:
Property: Cerium hexaborate (CeB6, also known as cerium borate, CeBix, CEBIX, sometimes written as CeB) is an inorganic compound. Cerium hexaborate (CeB6) has a CsCl structure (belonging to a simple cubic crystal system, with large spheres representing the Ce element). The difference is that B6 octahedral clusters occupy the position of Cl, while Ce occupies the position of Cs.
It is a refractory ceramic material with a lower work function, making it one of the known cathode materials with the highest electron emissivity, and it is also very stable in vacuum. The typical working temperature of cerium hexaborate is 1450 ° C. Cerium hexaborate, like lanthanum hexaborate, will slowly evaporate during cathode operation.
The CeB6 cathode can maintain its optimal shape for a longer period of time at an operating temperature of 1850 K, resulting in a longer lifespan. Meanwhile, due to its evaporation rate being about 30% slower than that of lanthanum borate, the thermal cathode coating of cerium borate is also more difficult to remove than lanthanum borate.
Technical data of Cerium Boride:
| Item |
Test result % |
| B |
31.6 |
| Ce |
67.9 |
| Si |
0.0004 |
| Mg |
0.0001 |
| Mn |
0.0001 |
| Fe |
0.01 |
| Ca |
0.003 |
| Cu |
0.0002 |
| Cr |
0.0001 |
Application of Cerium Boride:
Cerium boride is mainly used as a coating for hot cathodes, or hot cathodes are directly composed of cerium hexaborate crystals. Cerium hexaboride (CeB6) and lanthanum hexaboride (LaB6) are often used as high current cathode coatings. Hexaborides have a lower work function, around 2.5 eV, and have a certain tolerance to cathode contamination. Cerium boride cathodes have a lower evaporation rate than lanthanum boride at 1700 K, but they become consistent at 1850 K and even have a higher evaporation rate above that temperature.
Cerium boride cathode has a 50% longer lifespan than lanthanum boride due to its higher resistance to carbon pollution. The brightness of a boride cathode is ten times that of a tungsten cathode, and its lifespan is 10-15 times that of a tungsten cathode. Some laboratory experiments have shown that CeB6 is more tolerant to the negative effects of carbon pollution than LaB6. They are commonly used in fields such as electron microscopes, microwave tubes, electron beam etching, electron beam welding, X-ray tubes, and free electron lasers.
Cerium hexaboride (CeB6) is a cathode material with extremely high electron emissivity due to its lower work function. It is more resistant to carbon pollution and has a longer lifespan than lanthanum borate cathodes. It is widely used in fields such as electron microscopy, microwave tubes, electron beam etching, electron beam welding, X-ray tubes, and free electron lasers. Cerium hexaborate crystals have been successfully applied in desktop scanning electron microscopes, becoming excellent and stable filament materials.
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