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)	ΔH_fus/kJmol^-1	8.9(+/-0.4)
Outer electron configuration	4f⁶s²	ΔH_vap/kJmol^-1	165(+/-17)
Metal radius(6-coordinate)/pm	180.4	ΔH_{f(monoatomic gas)}/kJmol^-1	207
Ionic radius(6-coordinate)/pm III	95.8	ΔH_{(hydration Ln}³⁺₎/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	Remarks
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.

Foil
S1-3003-F 0.004" (0.1mm)
S1-3007-F 0.008" (0.2mm)

Powder
S1-10000-P -40 mesh

Rods
S1-2000-R 0.250" (6.35mm)
S1-2001-R 0.500" (12.7mm)

Sheet
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)

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