Lutetium, Lu

Lutetium is a chemical element with the symbol Lu and atomic number 71. A metallic element, lutetium usually occurs in association with yttrium and is sometimes used in metal alloys and as a catalyst in various processes. A strict correlation between periodic table blocks and chemical series for neutral atoms would describe lutetium as a transition metal because it is in the d-block, but it is a lanthanide according to IUPAC.

Technical Data
Symbol Lu Ionization energy/kJmol-1 III 2054
Atomic number 71 Density (25°C)/gcm-3 9.84
No. of naturally occurring isotopes 2 Melting point /°C 1652
Atomic weight 174.967(+/-3) Boiling point /°C -3327
Outer electron configuration 4f145d16s2 ΔHfus/kJmol-1  
Metal radius(6-coordinate)/pm 173.8 ΔHvap/kJmol-1 414
Ionic radius(6-coordinate)/pm III 86.1 ΔHf(monoatomic gas/kJmol-1 3760
Ionization energy/kJmol-1 I 513 Eo(M3+(aq)+ 3e- →M(S))/V -2.255
Ionization energy/kJmol-1 II 1341 Electrical resistivity (25 /°C )/μohm cm 68
Evaporation Techniques
Temperature (oC) @Vap. Pressure Techniques Remarks
10-8 Torr 10-6 Torr 10-4 Torr Electron Beam Crucible Coil Boat
- - 1300 Excellent Al2O3 - Tantalum  

Evaporation Materials
L4-5000-M pieces 3-6mm
L4-5001-M Ingot (Please ask for sizes)
L4-5002-M pieces 12mm and smaller

The foils are available in either rectangular or circular shape. Please enter width and length or diameter of the required foil.

Foil
L4-3003-F 0.004" (0.1mm)
L4-3007-F 0.008" (0.2mm)
Powder
L4-10000-P - 40 mesh
Rods
L4-2000-R 0.250" (6.35mm)
L4-2001-R 0.500" (12.7mm)
Sheet
L4-4002-S 0.020" (0.5mm)
L4-4003-S 0.030" (0.76mm)
L4-4004-S 0.040" (1mm)