|
OSMIUM
(Os)
GENERAL
PROPERTIES
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Symbol:
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Os
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|
Atomic
Number:
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76
|
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Atomic
Weight:
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190.2
|
|
Density:
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22.57
gm/cc
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Melting
Point:
|
3045
oC
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|
Boiling
Point:
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5027
oC
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Thermal
Conductivity:
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-
|
|
Electrical
Resistivity:
|
9.5
microhm-cm @ 20 oC
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|
Electronegativity:
|
2.2
Paulings
|
|
Specific
Heat:
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0.03127
Cal/g/oK
@ 25 oC
|
|
Heat
of Vaporization:
|
162
K-Cal/gm atom at 5027 oC
|
|
Heat
of Fusion:
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7.0
Cal/gm mole
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MATERIAL
OVERVIEW
Characteristics:
Hard white metal of the platinum group. On heating in
air it gives off poisonous fume of osmium tetroxide.
Insoluble in acids and aqua regia. Osmium is attacked
by fused alkalies. It has the highest specific gravity
and melting point of the platinum metals. It is
metallurgically unworkable.
Hazard:
Irritant to skin.
Derivation: Occurs with platinum from which it is
recovered during the purification process. Also occurs
with iridium as a natural alloy, iridosmine.
TYPICAL
ANALYSES
Impurities
in ppm
|
Material
/ Purity:
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3N7
|
|
Ca
|
50
|
|
Mg
|
50
|
|
Si
|
10
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Cu
|
10
|
|
Na
|
10
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POWDER, SHOT, PELLETS, & INGOT
|
Material
|
Purity
|
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Osmium
Powder-60 Mesh
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2N8,
3N
|
|
Osmium
Powder-325 Mesh
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2N8,
3N
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|
Osmium
Sponge
|
2N8,
3N
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Osmium
Shot 3-6mm 
|
2N8,
3N
|
Powder,
shot, pellets, and ingots are packaged to order and
sold by the gram or kilogram.
COMPOUNDS
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Material
|
Purity
|
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Ammonium
Hexabromoosmate (NH4)2OsBr6 -325 Mesh
|
3N5
5N
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|
Ammonium
Hexachloroosmate (NH4)2OsCl6 -325 Mesh
|
3N5
5N
|
|
Dihydrogen
Hexachloroosmate H2OsCl6-xH2O -325 Mesh
|
3N5,
5N
|
|
Osmium
Chloride OsCl4
-325
Mesh
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3N5,
5N
|
|
Osmium
Chloride Hydrate OsCl3-xH2O
-325
Mesh
|
3N5,
5N
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|
Osmium
Oxide OsO2
-325
Mesh
|
3N5
|
|
Osmium
Oxide OsO4
-325
Mesh
|
3N5
|
|
Potassium
Hexabromoosmate K2OsBr6 -325 Mesh
|
3N5,
5N
|
|
Potassium
Hexachloroosmate K2OsCl6 -325 Mesh
|
3N5,
5N
|
|
Sodium
Hexabromoosmate Na2OsBr6
-325
Mesh
|
3N5,
5N
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|
Sodium
Hexachloroosmate Na2OsCl6 -325 Mesh
|
3N5,
5N
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Compounds
are packaged to order and sold by the gram or
kilogram.
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