CommonProperties-TungstenMetal
Atomicnumber 74
Relativeatomicmass 183.85
Latticetype A2,bcc
Latticeparameter 0.31648nm
Atomicradius 0.139nm
Ionicradius (4-valent) 0.064nm
(6-valent) 0.068nm
Absorptioncrosssectionforthermalneutrons 19.2barns
1stionizationpotential 8.0eV
Meltingpoint 3422°C
BoilingPoint 5900°C
Heatoffusion 35.17kJ/mol
Heatofsublimation 850.8kJ/mol
Molarheatcapacity@20°C 24.28J/(mol.K)
Specificheatcapacity @25°C 0.135kJ/(kg.K)
@1000°C 0.17kJ/(kg.K)
@2000°C 0.20kJ/(kg.K)
Coefficientofthermalexpansion @500°C 2.3mm/m
@1500°C 7.6mm/m
@2000°C 19.2mm/m
Thermalconductivity @0°C 129.5W/(m.K)
@1000°C 112.5W/(m.K)
@2000°C 96.0W/(m.K)
Vapourpressure @1700°C 1x10-10Pa
@2300°C 4x10-1Pa
@3000°C 2x10-3Pa
StandardentropySo25°Cat101kPa 32.76J/(mol.K)
StandardenthalpyH025°C-H0-273°C 5.09x103J/mol
Specificelectricalresistivity @20°C 0.055µW.m
@1000°C 0.330µW.m
@2000°C 0.655µW.m
@3000°C 1.40µW.m
Magneticsusceptility@25°C 0.32x10-6cm3/g
Blackbodytemperature@727°C(l=665nm) 693°C
Spectralemission@25°C(l=665nm) 0.47
Electronemission @727°C 1.07x10-15A/cm2
@1627°C 2.28x10-4A/cm2
@2227°C 2.98x10-1A/cm2
Electronyield @727°C 1.77x10-5A/W
@1627°C 1.22x10-5A/W
@2227°C 4.26x10-5A/W
Density@20°C 19.3g/cm3
Hardness(Vickers)HV30 @0°C 450
recrystallized 300
deformed <650
@400°C 240
@800°C 190
Modulusofelasticity @0°C 407kN/mm2
@1000°C 365kN/mm2
@2000°C 285kN/mm2
Velocityofsound longitudinal 5320m/s
transverse 2840m/s
Minimumcompressionstrength(sintered) 1150N/mm2
Shearmodulus@20°C 177kN/mm2
Source:E.LassnerandW.D.Schubert,TUNGSTEN:properties,chemistry,technologyofthe
element,alloysandchemicalcompounds,ISBN0-306-45053-4,KluwerAcademic/Plenum
Publishers,NewYork(1990).