|
Purity |
99.99%min |
|
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 |
| Model | Te.3N | Te.4N | Te.5N |
| Te(Min%) | 99.9 | 99.99 | 99.999 |
| Impurity | Max ppm | ||
| Ag | 20 | 5 | 0.1 |
| Al | 10 | 8 | 0.4 |
| Cu | 10 | 5 | 0.5 |
| Cd | 10 | 2 | 0.1 |
| Fe | 30 | 10 | 0.2 |
| Mg | 50 | 5 | 0.1 |
| Ni | 50 | 5 | 0.5 |
| Pb | 20 | 10 | 0.5 |
| Sn | 20 | 3 | 1 |
| Zn | 30 | 5 | 0.1 |
| Se | 30 | 15 | 1 |
| Si | 20 | 10 | 0.5 |
| Bi | 30 | 8 | 0.4 |
| Total | 500 | 100 | 10 |
| Characteristic:It has a silver-white metallic appearance, a density of 6.25 g / cm3, a melting point of 452 ° C, a boiling point of 1390 ° C, and a hardness of 2.5 (Mohs hardness). There are two allotropic forms, crystalline and amorphous. Tellurium burns in the air with a blue flame and generates tellurium dioxide; it can react with halogens but not with sulfur and selenium. Soluble in sulfuric acid, nitric acid, potassium hydroxide and potassium cyanide solution. Poor heat transfer and electrical conductivity. Tellurium with a purity of more than 99.99% is called high-purity tellurium. |
| Application:It is used to prepare II-VI compound semiconductors, solar cells, thermoelectric conversion elements, refrigeration elements, light-emitting diodes, nuclear radiation detection, infrared detectors and other basic materials. |