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PBN Crucibles for Precision Application

Pyrolytic Boron Nitride Crucible can withstand high temperatures in a high vacuum environment. It has excellent thermal conductivity, corrosion resistance, and electrical resistance.

LA1408 Lanthanum Hexaboride Ceramic Part, LaB6 Parts

Catalog No. LA1408
Size Customized
Purity 98%, 99%, 99.9%
Molecular Formula LaB6
Crystal Structure Cubic

Datasheet

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LA1408 Lanthanum Hexaboride Ceramic Part, LaB6 Parts

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Lanthanum Hexaboride Ceramic Part Description

Lanthanum Hexaboride, also called LaB6 cathode, is an inorganic chemical of rare earth. With a melting point 2528 K, LaB6 cathode is a refractory ceramic material, which is insoluble in water or hydrochloric acid and very stable in a vacuum.

The unique properties of lanthanum hexaboride crystals provide stable electron-emitting media with work functions near 2.70 eV. The low work function yields higher currents at lower cathode temperatures than tungsten, which means greater brightness, or current at the beam focus, and longer LaB₆ cathode life. Typically, LaB₆ cathodes exhibit 10 times the brightness and 50 times the service life of tungsten cathodes. In electron microscope applications, these characteristics translate to more beam current in a smaller spot at the sample, improved resolution, and less frequent cathode replacement.

Lanthanum Hexaboride Ceramic Part Specification

Product	Lanthanum Hexaboride	Structure	Polycrystalline
Symbol	LaB6 cathode	Thermal Conductive	47 W/mK (20℃)
Cas No.	12008-21-8	Thermal Expansion	6.2 10^-6K^-1 (20-900℃)
Atomic Mass	203.78 g/mol	Electrical Resistance	ca.15 μΩ cm (20℃)
Density	4.72 g/cm³	Electrical Conductive	6.65×10⁴S/cm (20℃)
Melting Point	2528 K	Current Density	150 A/cm2 (1950℃)
Hardness	87.5 RA	Electron Emissivity	2.6 eV
Flexure Strength (σ)	200 Mpa	Fracture toughness (Kic)	3.0 MN/m³/2

Lanthanum Hexaboride Chemical Composition

LaB6 (% min.)
99.9%
B(% min.)
31%
Rare Earth Impurities		Non-RE Impurities
Ce	< 120ppm	Fe	< 250ppm
Pr	< 150ppm	Si	< 100ppm
Nd	< 180ppm	Ca	< 90ppm
Sm	< 112ppm	C	< 300ppm
Y	< 250ppm	Mg	< 100ppm
		Ti	< 100ppm

Lanthanum Hexaboride Ceramic Part 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

Material Data for LaB₆ and CeB₆

	CeB6	LaB6
Brightness (A/cm2-sr)	107	107
Short-term beam current stability % RMS	< 1	< 1
Typical service life (hr)	1,500+	1000+
Operating vacuum (torr)	10-7	10-7
Work function (eV)	~2.65	~2.70
Evaporation rate (g/cm2-sec)	1.6 x 10-9	2.2 x 10-9

Packing Service

ACM’s Lanthanum Hexaboride Ceramic Part is carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition.