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A rare earth metal of the lanthanide group, samarium does not occur free in nature, but is found with other rare earths in many minerals. Samarium is a lustrous, brittle, silvery-yellow metal that tarnishes in air. It is similar to iron in hardness. Samarium and cobalt, combined in SmCo<sub>5</sub>, have been used to make a permanent magnet with the highest resistance to demagnetization of any known material.
|Property Name||Property Value||Property Name||Property Value|
|Atomic Code||(62Sm150.36)||Covalent Radius||1.62Angstroms|
|CAS #||7440-19-9||Electrical Resistivity @ 298°C||105.0µΩ-cm|
|Boiling Point||1794°C||Thermal Neutron Cross Section||5500barns/atom|
|Density||7.52g/cm3||Magnetic Moment||1.74Bohr magnetons|
|Specific Heat @ 25°C||0.042cal/g°C||Magnetic Susceptibility||1,275x10-6emu/mole|
|Heat of Fusion||2.1k-cal/g-atom||Tensile Strength||18,000psi|
|Heat of Vaporization||46k-cal/g-atom||Yield Strength||16,200psi|
|Atomic Volume||19.9W/D||Transformation Temperature||924°C|
|First Ionization Energy||129K-cal/g-mole||Standard Electrode Potential||+2.2volts|