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PRODUCT DATA of Molybdenum
MaterialMolybdenum
Chemical Composition100Mo
CAS Registry ID7439-98-7
EXPERIENCE IN PRACTICE
Development StatusSpecial Commercial Product
Equivalent DesignationsMo
Space ExperienceGood
PHYSICAL PROPERTIES
Atomic Number42
Atomic Weight95.9 amu
Work Function5 eV
Crystal StructureBody centered cubic (bcc)
Surface Energy3140 mJ/m^2
Specific Gravity10.2
ELASTIC PROPERTIES
Tensile Modulus324 GPa
Bulk Modulus230 GPa
Poisson Ratio0.31
Speed of Sound (longitudinal)6300 m/s
Speed of Sound (transverse)3400 m/s
Acoustic Impedance64.2 MRayls
ELECTRICAL PROPERTIES
Electrical Volume Resistivity5.7e-8 ohm.m
Superconductivity Critical Temperature-272 °C
THERMAL PROPERTIES
Thermal Conductivity138 W/m.K
Thermal Expansion Coefficient5.1 μstrain/°C
Melting Range2610 °C
Specific Heat0.251 J/g.K
RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY
Corrosion/ThermalAbove 500C at atmopheric air pressure , the outer oxide layer MoO3 begins to volatilise, and about 770C the rate of evaporation equals the rate of oxidation. The rate is linear Above 815C (melting point of the oxide) the oxidation is catastropic.
EMF vs SCE-0.12 V
Remark: Measured in 3.5% NaCl solution
Data Quality: Design Data
Sublimation10-4mm/year at 1380°C
10-2mm/year at 1630°C
1 mm/year at 1900°C