Tellurium, Te

Tellurium is a chemical element that has the symbol Te and atomic number 52. A brittle silver-white metalloid which looks like tin, tellurium is chemically related to selenium and sulfur. Tellurium is primarily used in alloys and as a semiconductor.

Tellurium is extremely rare, one of the nine rarest elements on earth. It is in the same chemical family as oxygen, sulfur, selenium, and polonium (the chalcogens).

When crystalline, tellurium is silvery-white and when it is in its pure state it has a metallic luster. This is a brittle and easily pulverized metalloid. Amorphous tellurium is found by precipitating it from a solution of tellurous or telluric acid (Te(OH)6). However, there is some debate whether this form is really amorphous or made of minute crystals.

Technical Data
Symbol Te Density (25°C)/gcm-3 6.25
Atomic number 52 Melting point /°C 452
No. of naturally occurring isotopes 8 Boiling point /°C 990
Atomic weight 127.60(+/-0.03) ΔHatomization/kJmol-1 192
Electronic configuration [Kr]4d105s25p4 Electrical resistivity (25°C)/μohm cm 1
Metal radius (12-coordinate)/pm 160* Ionization energy/kJmol-1 869
Ionic radius/pm M2+ 221 Electronegativity χ 2.1
Ionic radius/pm M4+ 97 Band gap Eg/kJmol-1 32.2
Ionic radius/pm M6+ 56    
Evaporation Techniques
Temperature (oC) @Vap. Pressure Techniques Remarks
10-8 Torr 10-6 Torr 10-4 Torr Electron Beam Crucible Coil Boat
157 207 277 Poor Al2O3 & Quartz Tungsten Tungsten & Tantalum Wets w/o alloying. Toxic

Evaporation Materials
T2-5003-M Ingot (Please ask for sizes)
T2-5001-M chunks 20mm and smaller
T2-5004-M pieces 1-3mm
T2-5006-M pieces 3-12mm
T2-5007-M pieces 8-10mm
Powder
T2-10000-P -20 mesh
T2-10002-P -60 mesh
T2-10003-P -200 mesh
T2-10004-P -325 mesh
Rods
T2-2000-R 0.125" (3.175mm)
T2-2001-R 0.250" (6.35mm)
T2-2002-R 0.500" (12.7mm)
T2-2003-R 0.625" (15.88mm)
T2-2004-R 0.750" (19.05mm)
T2-2005-R 1" (25.4mm)