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Tellurium is a semiconductor materials showing a greater electrical conductivity depending on atomic alignment, the conductivity increases slightly when exposed to light (photoconductivity). When crystalline, tellurium is silvery-white and when it is in pure state it has a metallic luster. Amorphous tellurium is found by precipitating it from a solution of tellurous or telluric acid (Te(OH)6). When in its molten state, tellurium is corrosive to copper, iron and stainless steel.


available in 99.9%, 99.99%, 99.999%

CAS No. 13494-80-9
Molar mass 127.60 g/mol
Melting point 450℃
Boiling point 988℃
Density 6.24
Electronegativity 2.01
Band gap 0.35 eV

Specific heat

0.0481 Cal/g/K @ 25°C

Speed of sound

thin rod: 2610 m·s−1 (at 20 °C)

Thermal conductivity 2.35 W/m/K

Tellurium can be used for many different purposes including II-VI compound semiconductor materials, Telluride compounds, precision casting, special steel additives, refrigeration materials, infrared detectors, test instruments, chemical vapor deposition and physical vapor deposition processes. When combined with lead, tellurium increases resistance to sulfuric acid while improving strength and hardness.

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