Thulium ( Tm )

Material Information

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Atomic Properties

Atomic number	69
Atomic radius - Goldschmidt ( nm )	0.174
Atomic weight ( amu )	168.9342
Crystal structure	Hexagonal close packed
Electronic structure	Xe 4f13 6s2
Ionization potential	No.	eV
	1	6.18
	2	12.05
	3	23.71
Natural isotope distribution	Mass No.	%
	169	100
Thermal neutron absorption cross-section ( Barns )	115
Valences shown	2, 3

Electrical Properties

Electrical resistivity @20C ( µOhmcm )	90
Temperature coefficient @0-100C ( K-1 )	0.00195

Mechanical Properties

Material condition	Polycrystalline
Bulk modulus ( GPa )	40.5
Hardness - Brinell	53
Poisson's ratio	0.235
Tensile modulus ( GPa )	76

Physical Properties

Boiling point ( C )	1947
Density @25C ( g cm-3 )	9.322
Melting point ( C )	1545

Thermal Properties

Coefficient of thermal expansion @0-400C ( x10-6 K-1 )	11.6
Latent heat of evaporation ( J g-1 )	1456
Latent heat of fusion ( J g-1 )	109
Specific heat @25C ( J K-1 kg-1 )	160
Thermal conductivity @0-100C ( W m-1 K-1 )	16.9

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Buy Thulium on-line

Standard products are available in these forms

Foil Lump Rod Sputtering Target Wire

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