Lanthanum Foil (Light Tight)

Lanthanum Foil (Light Tight) is distinguished by its complete opacity to light, achieved by eliminating pinholes and ensuring uniform coverage, while retaining lanthanum’s inherent reactivity and oxide-forming capability. This makes it particularly valuable in environments requiring both light shielding and chemically active surfaces. It is used across industries such as energy storage, high-vacuum technology, and catalysis, where stability under demanding operational conditions is essential. Specific applications include electrode layers in next-generation secondary batteries, protective oxidation barriers for high-temperature alloy systems, and specialized light-blocking layers in sensitive optical and electronic setups. Research highlights its ability to enhance oxidation resistance in alloys and its potential for advanced battery electrode configurations, where controlled lanthanum reactions underpin improved performance. In both industrial and scientific contexts, Lanthanum Foil (Light Tight) stands out as a multifunctional material enabling light control, chemical stability, and advanced surface engineering.

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Properties

Reference & Citations

Flammable

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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