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Lanthanum Rod

Formula: La
Percentage Purity: 99%
Diameter: 6.35mm
Length: 100mm
Production Method: Cast
CAS Number: 7439-91-0
UOM Code: 633-770-17
Legacy Code: LA007910
Distributor Code: GF63377017
SKU: 1000125773
Product Code: LA00-RD-000110

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