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 |
|
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