Chromium, Cr

Chromium is a chemical element which has the symbol Cr and atomic number 24. It is a steel-gray, lustrous, hard metal that takes a high polish and has a high melting point. It is also odourless, tasteless, and malleable.

Technical Data
Symbol Cr Ionic radius(6-coordinate)/pm IV 55
Atomic number 24 Density (20°C)/gcm-3 7.14
No. of naturally occurring isotopes 4 Melting point / °C 1900
Atomic weight 51.996 Boiling point / °C 2690
Electronic configuration [Ar]3d54s1 ΔHfus/kJmol-1 21 (+/-2)
Ionization energy/kJmol -1 653 ΔHvap/kJmol-1 342 (+/-6)
II 1592 ΔHf(monoatomic gas)/kJmol-1 397 (+/-3)
III 2987 Electrical resistivity  
Metal radius(12-coordinate)/pm 128 (20°C)/ μohm cm 13
Ionic radius(6-coordinate)/pm VI 44 Electronegativity χ 1.6
Ionic radius(6-coordinatc)/pm V 49    
Evaporation Techniques
Temperature (oC) @Vap. Pressure Techniques Remarks
10-8 Torr 10-6 Torr 10-4 Torr Electron Beam Crucible Coil Boat
837 Sublimes 977 Sublimes 1157 Sublimes Good Vitreous Graphite Tungsten Cr plated rod or strip Films very adherent. High rates possible. Cr plated rods are ideal for depositing Cr.

Evaporation Materials
C6-5000-M cubes 6mm x 6mm x 6mm
C6-5001-M flakes
C6-5002-M pellets 6mm diameter x 6mm long
C6-5007-M pieces 2-4.7mm
C6-5008-M pieces 3-6mm
C6-5009-M pieces 3-12mm
C6-5010-M pieces <25mm
C6-5016-M pieces 1-3mm
C6-5019-M pieces 3-5mm
Powder
C6-10000-P -60 mesh
C6-10001-P -100 mesh
C6-10004-P -200 mesh
C6-10006-P -325 mesh
Rods
C6-2000-R 0.125" (3.175mm)
C6-2001-R 0.250" (6.35mm)
C6-2002-R 0.500" (12.7mm)
C6-2003-R 2mm
C6-2004-R 10mm