
Cerium boride
CAS number: 12008-02-5
EINECS number: 234-526-9
Molecular formula: CeB6
Molecular weight: 204.98
Particle size grade: micron/submicron/nanometer
Purity: 99.9%
Colour: gray-black
Crystal: cubic
Melting point: 2552 ℃
Density: 4.80g /cm3
Specific surface area: 10.92 m2/g
- Description
- Inquiry
CeB6 is a cathode material with high electron emissivity due to its low power function, which is more resistant to carbon pollution and has a longer life than lanthanum boride cathode. It is widely used in electron microscope, microwave tube, electron beam etching, electron beam welding, X-ray tube and free electron laser medium fields. At present, cerium hexaboride crystals have been successfully used in the desktop scanning electron microscope and become excellent and stable filament materials. Cerium hexaboride [1] (CeB6, also known as cerium boride, CeBix, CeBix, sometimes written CeB) is an inorganic compound. Cerium hexaboride (CeB6) has a CsCl structure (belonging to a simple cubic crystal system, whose crystal structure is shown in Figure 1, and the large ball represents the Ce element). The difference is that the B6 octahedral cluster occupies the position of Cl and the Ce occupies the position of Cs. It is a refractory ceramic material with a low work function which makes it one of the known cathode materials with high electron emissivity, and it is also very stable in vacuum. Cerium hexaboride normally operates at 1450°C. Cerium hexaboride, like lanthanum hexaboride, evaporates slowly while working at the cathode. CeB6 cathode can maintain its shape for a longer period of time at 1850 K operating temperature, so its life is longer. At the same time, because the evaporation rate is about 30% slower than lanthanum boride, cerium boride’s hot cathode coating is more difficult to remove than lanthanum boride.
Application
Cerium hexaboride is mainly used as coating for the hot cathode, or the hot cathode is directly composed of cerium hexaboride crystal. Cerium hexaboride (CeB6) and lanthanum hexaboride (LaB6) are often used as high current thermal cathodic coatings. Hexaboride has a low work function, about 2.5 eV, and has some tolerance to cathode pollution. Cerium boride cathodes have a lower evaporation rate than lanthanum boride at 1700 K, but they become uniform at 1850 K and even higher above this temperature. Cerium boride cathode has a 50% longer life than lanthanum boride due to its higher carbon pollution resistance. The boride cathode is ten times brighter and lasts ten to fifteen times longer than the tungsten cathode. Some laboratory tests have shown that CeB6 is more resistant to the negative effects of carbon pollution than LaB6. They are commonly used in electron microscopes, microwave tubes, electron beam etching, electron beam welding, X-ray tubes, and free electron lasers.
Related Products
-
Read MoreQuick View
Nano Dysprosium Oxide
Other name: Didysprosium trioxide
CAS no. : 1308-87-8
EINECS no. : 215-164-0
Molecular formula: Dy2O3
Molecular weight: 372.9982
Melting point: 2330-2350 ℃
Solubility: insoluble
Read MoreQuick View -
Read MoreQuick View
Lanthanum titanate
Other name: Lanthanum titanium oxide, Lanthanum (+ 3) cation;
Oxygen anion (2); Titanium (+ 4) cation; Lanthanum (3 +); Oxygen (2 -) dihydride; titanium
CAS no. : 12031-47-9; 144087-28-5
EINECS no. : 234-751-2
Formula: La2O7Ti2
Molecular weight: 485.54Read MoreQuick View -
Read MoreQuick View
Neodymium metaphosphate
Laser glass additive Neodymium phosphate
English name: Neodymium metaphosphate
Chemical formula: Nd (PO3) 3
Read MoreQuick View -
Read MoreQuick View
Praseodymium fluoride
Other name: Praseodymium trifluoride
CAS no. : 13709-46-1
EINECS no. : 237-254-9
Formula: F3Pr.
Molecular weight: 197.9029
Read MoreQuick View -
Read MoreQuick View
Lanthanum manganate
Purity: not less than 99.9%
Application: Solid fuel cells, semiconductors, catalysts
Read MoreQuick View -
Read MoreQuick View
Lutetium fluoride
Other name: Lutetium Fluoride Anhydrous,Lutetium trifluoride,Lutetium(III) fluoride
Chemical formula: LuF3
CAS: 13760-81-1
EINECS: 237-355-8
Melting point: 1182 ℃
Boiling point: 2200 ℃
Density: 8.33 g/mlDescription: white powder, no crystal water. Insoluble in water, hydrochloric acid, nitric acid and sulfuric acid, but soluble in perchloric acid.
Read MoreQuick View -
Read MoreQuick View
Lanthanum zirconate
Purity: 2N, 3N
CAS no. : 12031-48-0
Molecular formula: La2O9Zr3
Molecular weight: 695.46Widely used in microelectronics, catalysts, ferroelectric materials, / lithium batteries, semiconductors and other electronic fields.
Read MoreQuick View -
Read MoreQuick View
Lanthanum metaphosphate
Laser glass material additive
English name: Lanthanum metaphosphate
Chemical formula: La (PO3) 3
Read MoreQuick View -
Read MoreQuick View
Anhydrous Praseodymium Chloride
Other name: Praseodymium chloride ; Praseodymium trichloride; Praseodymium(III) chloride
CAS no. : 10361-79-2
EINECS no. : 233-794-4
Molecular formula: Cl3Pr
Molecular weight: 247.2666
Melting point : 786 ℃
Boiling point 1700℃
Solubility in water
Dense degree of 4.02 g/cm3
Flash point 1700℃
The vapor pressure: 33900 MMHG at 25°C
Hazard description : stimulation
Read MoreQuick View -
Read MoreQuick View
Thuliium acetylacetonate trihydrate
Other name: THULIUM 2,4-PENTANEDIONATE, TRIHYDRATE, THULIUM (III) ACETYLACETONATE TRIHYDRATE; Thuliiumacetylacetonate
CAS no. : 14589-44-7
Molecular formula: C15H21O6Tm
Molecular weight: 466.2578
Melting point: 121-123℃
Read MoreQuick View