Lanthanum Foil (Light Tight)

Formula: La

Form: Foil (Light Tight)

Material: Lanthanum

CAS Number: 7439-91-0

Commodity: Metals

Purity: 99%

Temper: As Rolled

Thickness: 0.5mm

Light Tight: Light Tight

Hazard Pictogram: GHS02

Lanthanum Foil (Light Tight) is a metal foil product from Goodfellow's range of foils. Lanthanum has a silvery-white luster and is soft, ductile and malleable. It is highly reactive and oxidizes rapidly in air. Key properties of lanthanum include its low density, high electrical resistivity and excellent high-temperature strength. Lanthanum foil sees use in research applications and specialized light blocking. Its low density makes it useful for applications where weight is a key factor. The foil's ductility allows it to be formed into complex shapes while retaining light blocking properties. Lanthanum's high melting point also enables use in high temperature environments.

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Material Properties for Metals

Atomic Properties

Element	Value
Atomic number	57
Crystal structure	Hexagonal close packed/Face centred cubic
Electronic structure	Xe 5d¹ 6s²
Valences shown	3
Atomic weight( amu )	138.9055
Thermal neutron absorption cross-section( Barns )	8.9
Photo-electric work function( eV )	3.5
Natural isotope distribution( Mass No./% )	139/ 99.91
Natural isotope distribution( Mass No./% )	138/ 0.09
Atomic radius - Goldschmidt( nm )	0.187
Ionisation potential( No./eV )	3/ 19.18
Ionisation potential( No./eV )	1/ 5.58
Ionisation potential( No./eV )	2/ 11.06

Mechanical Properties

Element	Value
Material condition	Polycrystalline
Poisson's ratio	0.28
Bulk modulus( GPa )	24.8
Tensile modulus( GPa )	37.9
Hardness - Vickers( kgf mm⁻² )	40
Tensile strength( MPa )	131
Yield strength( MPa )	124

Electrical Properties

Element	Value
Electrical resistivity( µOhmcm )	57@20@20°C
Superconductivity critical temperature( K )	4.88
Temperature coefficient( K⁻¹ )	0.00218@0-100°C

Physical Properties

Element	Value
Boiling point( C )	3457
Density( gcm⁻³ )	6.174@20°C

Thermal Properties

Element	Value
Melting point( C )	921
Latent heat of evaporation( J g⁻¹ )	2897
Latent heat of fusion( J g⁻¹ )	60.2
Specific heat( J K⁻¹ kg⁻¹ )	197@25°C
Thermal conductivity( W m⁻¹ K⁻¹ )	13.4@0-100°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ )	4.9@0-100°C

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Lanthanum Foil (Light Tight)

Material Properties for Metals