Molybdenum, Mo

Molybdenum (from the Greek meaning "lead-like"), is a Group 6 chemical element with the symbol Mo and atomic number 42. It has the sixth-highest melting point of any element, and for this reason it is often used in high-strength steel alloys. Molybdenum is found in trace amounts in plants and animals, although excess molybdenum can be toxic in some animals. Molybdenum was discovered in 1778 by Carl Wilhelm Scheele and first isolated in 1781 by Peter Jacob Hjelm.

Technical Data
Symbol Mo Melting point /°C 1620
Atomic number 42 Boiling point /°C 4650
No. of naturally occurring isotopes 7 ΔHfus/kJmol-1 28(+/-3)
Atomic weight 95.94 ΔHvap/kJmol-1 590(+/-21)
Electronic configuration [Kr]4d5s7 ΔHf(monoatomic gas)/kJmol-1 664(+/-13)
Metal radius( 12-coordinate)/pm 139 Electrical resistivity (20°C)/μohm cm ~5
Ionic radius(6-coordinate)/pm VI 59 Electronegativity χ 1.8
Ionic radius(6-coordinate)/pm V 61 Ionization energy/kJmol-1 I 685
Ionic radius(6-coordinate)/pm IV 65 Ionization energy/kJmol-1 II 1558
Ionic radius(6-coordinate)/pm III 69 Ionization energy/kJmol-1 III 2621
Density (20°C)/gcm-3 10.28  
Evaporation Techniques
Temperature (oC) @Vap. Pressure Techniques Remarks
10-8 Torr 10-6 Torr 10-4 Torr Electron Beam Crucible Coil Boat
1592 1822 2117 Excellent - - - Films smooth, hard. Careful degas required.

Evaporation Materials
M4-5000-M Ingot (Please ask for sizes)
M4-5001-M pellets 6mm diameter x 3mm long
M4-5002-M pellets 6mm diameter x 6mm long
M4-5003-M pellets 12mm diameter x 6mm long
M4-5004-M pieces 1-3 mm
M4-5008-M pellets 3mm diameter x 3mm long

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

M4-3003-F 0.004" (0.1mm)
M4-3007-F 0.008" (0.2mm)
M4-10000-P -100 mesh
M4-10002-P -325 mesh
M4-10003-P 2-4 microns
M4-10001-P 1-2 micron
M4-2000-R 0.0625" (1.58mm)
M4-2001-R 0.125" (3.175mm)
M4-2010-R 0.157" (4mm)
M4-2008-R 0.197" (5mm)
M4-2002-R 0.250" (6.35mm)
M4-2003-R 0.500" (12.7mm)
M4-2004-R 0.625" (15.88mm)
M4-2005-R 0.750" (19.05mm)
M4-2007-R 0.787" (20mm)
M4-2006-R 1" (25.4mm)
M4-2009-R 1.181" (30mm)
M4-4001-S 0.020" (0.5mm)
M4-4002-S 0.030" (0.76mm)
M4-4003-S 0.040" (1mm)
M4-4006-S 0.060" (1.5mm)
M4-4008-S 0.125" (3.175mm)
M4-4009-S 0.250" (6.35mm)
M4-4010-S 0.375" (9.525mm)
M4-4011-S 0.500" (12.7mm)
M4-4012-S 0.750" (19.05mm)
M4-4013-S 1" (25.4mm)
M4-1000-W 0.001" (0.025mm)
M4-1001-W 0.002" (0.05mm)
M4-1003-W 0.004" (0.1mm)
M4-1005-W 0.006" (0.152mm)
M4-1007-W 0.008" (0.203mm)
M4-1010-W 0.012" (0.3mm)
M4-1012-W 0.020" (0.5mm)
M4-1020-W 0.025" (0.635mm)
M4-1014-W 0.040" (1.0mm)
M4-1021-W 0.043" (1.1mm)
M4-1022-W 0.047" (1.2mm)
M4-1023-W 0.051" (1.3mm)
M4-1024-W 0.055" (1.4mm)
M4-1016-W 0.060" (1.5mm)
M4-1018-W 0.080" (2.0mm)