Samarium Oxide - 5810
Formula
Sm2O3
Formula Weight 348.8
Chem. Abs. #12060-58-1
Apperance

Buff Powder
Physical Properties
Melting Point =2,335' C
Crystal Density 7.09 g/cm3
C-Ln2O3 type structure
Packaging
55 lb and 55 Kg in a sealed bag inside a 5 gallon plastic pail
2 lb & 10 lb packages - for small shipments
Shipping Point
Mountain Pass, CA
Product Composition
Samarium Oxide
Loss on Ignition @ 1,000' C 1% max
Sm2O3
96.0
%min
La2O
0.1
%max
Ce02
0.1
%max
Pr6O11
0.2
%max
Nd2O3
2.0
%max
Eu2O3+Gd2O3
2.0
%max
Fe2O3
-
CaO
Total
MgO
250 ppm max
SiO2
-
 
Total Carbon
0.1
%max
Particle Size 1 - 5 microns
Tap Density 1.5 g/cm3 min
Screened - 30 mesh

Chemical Properties
The oxide is hygroscopic and will absorb moisture and carbon dioxide from the atmosphere. It is insoluble in water but soluble in mineral acids to form solutions of Sm3+ salts. Sm(III) compounds resemble other Ln(III) compounds in their properties—the carbonate, hydroxide and oxalate are insoluble in water whereas the chloride and nitrate are soluble. Under extreme reducing conditions Sm(II) compounds can be prepared, Sm(III/Sm(II) = -1.55 V.