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Beryllium, Be

Beryllium is a chemical element with the symbol Be and atomic number 4. A bivalent element, beryllium is a steel grey, strong, light-weight yet brittle, alkaline earth metal. It is primarily used as a hardening agent in alloys, most notably beryllium copper. Commercial use of beryllium metal presents technical challenges due to the toxicity (especially by inhalation) of beryllium-containing dusts.

Beryllium is relatively rare element in both the Earth and the universe, due to the fact that it is not formed in conventional stellar nucleosynthesis. The element is not known to be necessary or useful for either plant or animal life.

Technical Data
Symbol	Ba	Density (20°C)/gcm^-3	3.62
Atomic number	56	Melting point /°C	725
No. of naturally occurring isotopes	7	Boiling point /°C	-1850
Atomic weight	137.33	ΔH_fus/kJmol^-1	7.8
Electronic configuration	[Xe] 6s²	ΔH_vap/kJmol^-1	136
Ionization energy/kJmol I	502.7	Electrical resistivity
II	965	(20°C)/ μohm cm	50
Metal radius/pm	222	E^o(M^2-_(aq)2e^-→M_(S))/V	-2.91
Ionic radius/pm (6-coord)	13.5

Evaporation Techniques
Temperature (^oC) @Vap. Pressure			Techniques				Remarks
10^-8 Torr	10^-6 Torr	10^-4 Torr	Electron Beam	Crucible	Coil	Boat	Remarks
710	878	1000	Excellent	Graphite & Vitreous Graphite	Tungsten	Tantalum & Tungsten	Wets W, Mo & Ta. Metal powder & oxides are toxic. Evaporates easily.

Evaporation Materials
B2-5000-M Ingot (Please ask for sizes)
B2-5001-M Lumps 25mm and smaller
B2-5004-M Pieces 3-12mm
B2-5005-M Shot 3mm

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

Foil
B2-3000-F 0.001" (0.025mm)
B2-3001-F 0.002" (0.051mm)
B2-3002-F 0.003" (0.076mm)
B2-3003-F 0.004" (0.102mm)
B2-3004-F 0.005" (0.127mm)
B2-3005-F 0.006" (0.152mm)
B2-3006-F 0.007" (0.178mm)
B2-3007-F 0.008" (0.203mm)
B2-3008-F 0.009" (0.229mm)

Powder
B2-10000-P -100 mesh
B2-10000-P -200 mesh
B2-10000-P -325 mesh

Sheet
B2-4000-S 0.010" (0.254mm)
B2-4001-S 0.015" (0.381mm)
B2-4002-S 0.020" (0.508mm)
B2-4003-S 0.030" (0.762mm)
B2-4004-S 0.040" (1.016mm)
B2-4005-S 0.050" (1.270mm)

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