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PRODUCT DATA of Osmium
MaterialOsmium
General InformationOsmium is the densest naturally occurring element
Use in Spacecraftcoating for mirrors
PrecautionsOsmium oxide is toxic
Chemical Composition100Os
CAS Registry ID7440-04-2
EXPERIENCE IN PRACTICE
Equivalent DesignationsOs
Space Experiencefair
PHYSICAL PROPERTIES
Atomic Number76
Atomic Weight190.23 amu
Crystal Structurehexagonal close-packed (hcp)
Specific Gravity22.7
ELASTIC PROPERTIES
Tensile Modulus560 GPa
Shear Modulus222 GPa
Bulk Modulus462 GPa
Poisson Ratio0.25
ELECTRICAL PROPERTIES
Electrical Volume Resistivity9.5e-8 ohm.m
THERMAL PROPERTIES
Thermal Conductivity86.9 W/m.K
Thermal Expansion Coefficient6.6 ustrain/°C
Melting Range3050 °C
Specific Heat0.13 J/g.K
RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY
Atmospheric CorrosionOsmium oxide is toxic: special precautions shall be taken when work is done on this material. it sublimes at room temperature
Atomic OxygenAttacked by atomic oxygen