Terbium, Tb

Terbium is a chemical element with the symbol Tb and atomic number 65.

Terbium is a silvery-white rare earth metal that is malleable, ductile and soft enough to be cut with a knife. It is reasonably stable in air, and two crystal allotropes exist, with a transformation temperature of 1289 °C. Terbium(III) cation is brilliantly fluorescent, in a beautiful bright lemon-yellow color that is the result of a strong green emission line in combination with other lines in the orange and red. The yttrofluorite variety of the mineral fluorite owes its creamy-yellow fluorescence in part to terbium.

Technical Data
Symbol Tb Melting point / C 1356
Atomic number 65 Boiling point / °C -2800
No. of naturally occurring isotopes 1 ΔHvap/kJmol-1 293
Atomic weight 158.9254 ΔHf(monoatomic gas)/kJmol-1 389
Outer electron configuration 4f962 ΔH(hydration Ln3+)/kJmol-1 3605
Metal radius(6-coordinate)/pm 177.3 Electrical resistivity  
Ionic radius(6-coordinate)/pm IV 76 (25°C)/μohm cm 116
Ionic radius(6-coordinate)/pm III 92.3 Ionization energy/kJmol-1 I 569
E° (M4+(aq)\ + e- →M3+(aq))/V 2.7 Ionization energy/kJmol-1 II 1112
E° (M3+(aq)\ + 3e- →M(s))/V -2.391 Ionization energy/kJmol-1 III 2122
Density (25 C)/gcm 8.253    
Evaporation Techniques
Temperature (oC) @Vap. Pressure Techniques Remarks
10-8 Torr 10-6 Torr 10-4 Torr Electron Beam Crucible Coil Boat
800 950 1150 Excellent Al2O3 - Tantalum  

Evaporation Materials
T3-5000-M Ingot (Please ask for sizes)
T3-5001-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
T3-3003-F 0.004" (0.1mm)
T3-3007-F 0.008" (0.2mm)
Powder
T3-10000-P -40 mesh
T3-10001-P -325 mesh
Rods
T3-2000-R 0.250" (6.35mm)
T3-2001-R 0.500" (12.7mm)
Sheet
T3-4001-S 0.015" (0.38mm)
T3-4002-S 0.020" (0.5mm)
T3-4003-S 0.030" (0.76mm)
T3-4004-S 0.040" (1mm)