- Elements List
- Aluminium, Al
- Antimony, Sb
- Arsenic, As
- Barium, Ba
- Beryllium, Be
- Bismuth, Bi
- Boron, B
- Cadmium, Cd
- Calcium, Ca
- Carbon, C (Graphite)
- Cerium, Ce
- Cesium, Cs
- Chromium, Cr
- Cobalt, Co
- Copper, Cu
- Dysprosium, Dy
- Erbium, Er
- Europium, Eu
- Gadolinium, Gd
- Gallium, Ga
- Germanium, Ge
- Gold, Au
- Hafnium, Hf
- Holmium, Ho
- Indium, In
- Iridium, Ir
- Iron, Fe
- Lanthanum, La
- Lead, Pb
- Lithium, Li
- Lutetium, Lu
- Magnesium, Mg
- Manganese, Mn
- Mercury, Hg
- Molybdenum, Mo
- Neodymium, Nd
- Nickel, Ni
- Niobium, Nb
- Osmium, Os
- Palladium, Pd
- Phosphorus, P
- Platinum, Pt
- Potassium, K
- Praseodymium, Pr
- Rhenium, Re
- Rhodium, Rh
- Rubidium, Rb
- Ruthenium, Ru
- Samarium, Sm
- Scandium, Sc
- Selenium, Se
- Silicon, Si
- Silver, Ag
- Sodium, Na
- Strontium, Sr
- Sulphur, S
- Tantalum, Ta
- Tellurium, Te
- Terbium, Tb
- Thallium, Tl
- Thorium, Th
- Thulium, Tm
- Tin, Sn
- Titanium, Ti
- Tungsten, W
- Vanadium, V
- Ytterbium, Yb
- Yttrium, Y
- Zinc, Zn
- Zirconium, Zr
Tellurium, Te
Description
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.
Available Forms:
| 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 Go to Evaporation Sources Page | |
Unit 12, Hassocks Wood, Basingstoke, Hampshire, RG24 8UQ, UK. High Purity Materials For Research, Development and Industry
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