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Your current location :Home > Lanthanum hexaboride LaB6

Lanthanum Hexaboride (LaB6)

Lanthanum hexaboride (LaB6, also called lanthanum boride and LaB6) is an inorganic chemical, a boride of lanthanum. It is a refractory ceramic material that has a melting point of 2210°C, and is insoluble in water and hydrochloric acid. It has a low work function and one of the highest electron emissivities known, and is stable in vacuum. Stoichiometric samples are colored intense purple-violet, while boron-rich ones (above LaB6.07) are blue. Ion bombardment changes its color from purple to emerald green,LaB6 is a superconductor with a relatively low transition temperature of 0.45 K.

Application : The principal use of lanthanum hexaboride is in hot cathodes, either as a single crystal or as a coating deposited by physical vapor deposition. Hexaborides, such as lanthanum hexaboride (LaB6) and cerium hexaboride (CeB6), have low work functions, around 2.5eV. They are also somewhat resistant to cathode poisoning. Cerium hexaboride cathodes have a lower evaporation rate at 1700K than lanthanum hexaboride, but they become equal at temperatures above 1850K.Cerium hexaboride cathodes have one and half the lifetime of lanthanum hexaboride, due to the former's higher resistance to carbon contamination. Hexaboride cathodes are about ten times "brighter" than tungsten cathodes, and have 10-15 times longer lifetime. Devices and techniques in which hexaboride cathodes are used include electron microscopes, microwave tubes, electron lithography, electron beam welding, X-ray tubes, and free electron lasers. Lanthanum hexaboride slowly evaporates from the heated cathodes and forms deposits on the Wehnelt cylinders and apertures. LaB6 is also used as a size/strain standard in X-ray powder diffraction to calibrate instrumental broadening of diffraction peaks.

Basic Information

Name: Lanthanum Hexaboride
Symbol: LaB6

Atomic Mass:203.78g/mol

Density @ 293 K: 4.72 g/cm3

Cas No.:12008-21-8

Melting point: 2210℃
Hardness: 87.5RA

Color: intense purple violet

Crystal structure : Cubic

    Solubility in water: insoluble

    Space group: Pm3m; Oh

    Expansion Coefficient: 1/℃ x 10-6
    Conductive Coefficient: 0.047
    Resistance: 15.0
    Work function: 2.6eV
    Flexure Strength (σ): 200 MPa
    Fracture toughness (Kic): 3.0 MN/m3/2

Lanthanum Hexaboride (LaB6) Cathode Lanthanum Hexaboride (LaB6) Cathodes 

Purity--- >99.9%  

Density--- >4.3g/cm3  (RD90%)

Dimension---Custom-Made

Application --- Cathode

Lanthanum Hexaboride (LaB6) Sputtering TargetsLanthanum Hexaboride (LaB6) Sputtering Targets

Purity --- 99.9%  

Density --- >4.3g/cm3 (RD90%)

Shape ---

Discs, Plate, Step (Dia ≤480mm, Thickness ≥1mm)

Rectangle, Sheet,  Step (Length ≤420mm, Width ≤270mm, Thickness ≥1mm)

Tube( Diameter< 200mm,  Thickness >2mm )

Application --- coater for precision optical coating...

Lanthanum Hexaboride (LaB6) Evaporation Material

Purity --- >99.9%  Density--- 4.3g/cm3 (RD90%)

Shape --- Rod, Powder, Disk...

Application --- coater for precision optical coating...

Lanthanum Hexaboride Powder

Purity---99.9%

Granularity --- Custom-made, can be nanometer < 100nm

Application ---

Relation Products:

Boron sputtering targets - B;

Boron carbide sputtering target - B4C;

Boron Nitride sputtering target - BN;

Aluminium Diboride Sputtering target - AlB2;

Cerium Hexaboride sputtering targets - CeB6;

Chrominium Boride sputtering targets - CrB;

Cobalt Boride sputtering target - CoB;

Hafnium Diboride (HfB2) Sputtering Target - HfB2;

Iron Boride sputtering targets - FeB;

Lathanum Hexaboride sputtering targets - LaB6;

Magnesium Diboride sputtering targets - MgB2;

Molybdenum Diboride sputtering targets - MoB2;

Neodymium Boride (NdB) Sputtering Target;

Nickel Boride sputtering targets -Ni2B;

Niobium Diboride (NbB2) Sputtering target - NbB2;

Tantalum Diboride Sputterng target - TaB2;

Titanium Aluminum Boron Sputtering Targets - TiAlB;

Titanium Diboride sputtering targets - TiB2;

Tungsten Diboride Sputtering tarets - WB2;

Vanadium Boride (VB2) Sputtering Target - VB / VB2;

Zirconium Diboride Sputtering targets - ZrB2;

 

 

 

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