Samarium, Sm

Samarium is a chemical element with the symbol Sm and atomic number 62.

Samarium is a rare earth metal, with a bright silver luster, that is reasonably stable in air; it ignites in air at 150 °C. Even with long-term storage under mineral oil, samarium is gradually oxidized, with a grayish-yellow powder of the oxide-hydroxide being formed. Three crystal modifications of the metal also exist, with transformations at 734 and 922 °C.

Technical Data
Symbol Sm Density (25 C)/gcm 7.536
Atomic number 62 Melting point /°C 1072
No. of naturally occurring isotopes 7 Boiling point /°C 1800
Atomic weight 150.36 (+/-3) ΔHfus/kJmol-1 8.9(+/-0.4)
Outer electron configuration 4f6s2 ΔHvap/kJmol-1 165(+/-17)
Metal radius(6-coordinate)/pm 180.4 ΔHf(monoatomic gas)/kJmol-1 207
Ionic radius(6-coordinate)/pm III 95.8 ΔH(hydration Ln3+)/kJmol-1 3515
Ionic radius(7-coordinate)/pm II 122 Ionization energy/kJmol-1 I 542
E° (M3+(aq)\ + e- →M2+(aq))/V -1 Ionization energy /kJmol-1 II 1068
E° (M3+(aq)\ + 3e- →M(s))/V -2.414 Ionization energy/kJmol-1 III 2285
Electrical resistivity (25 °C)/μohm cm 92  
Evaporation Techniques
Temperature (oC) @Vap. Pressure Techniques Remarks
10-8 Torr 10-6 Torr 10-4 Torr Electron Beam Crucible Coil Boat
373 460 573 Good Al2O3 - Tantalum  

Evaporation Materials
S1-5000-M pieces 12mm and smaller
S1-5004-M 3mm pieces

The foils are available in either rectangular or circular shape. Please enter width and length or diameter of the required foil.

S1-3003-F 0.004" (0.1mm)
S1-3007-F 0.008" (0.2mm)
S1-10000-P -40 mesh
S1-2000-R 0.250" (6.35mm)
S1-2001-R 0.500" (12.7mm)
S1-4001-S 0.015" (0.38mm)
S1-4002-S 0.020" (0.5mm)
S1-4003-S 0.030" (0.76mm)
S1-4004-S 0.040" (1mm)