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	ΔH_vap/kJmol^-1	293
Atomic weight	158.9254	ΔH_{f(monoatomic gas)}/kJmol^-1	389
Outer electron configuration	4f⁹6²	ΔH_{(hydration Ln}³⁺₎/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	Remarks
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)

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