Tellurium dioxide
From Wikipedia, the free encyclopedia
| Tellurium dioxide | |
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| Other names | Tellurium(IV) oxide |
| Molecular formula | TeO2 |
| Molar mass | 159.60 g/mol |
| Appearance | White solid |
| CAS number | [7446-07-3] [1] |
| Density | 5.670 g/cm3 |
| Solubility (water) | Highly insoluble |
| Melting point | 733 °C |
| Boiling point | 1245 °C |
| Disclaimer and references | |
Tellurium dioxide (TeO2 or paratellurite) is a solid oxide of tellurium. It is used as an acousto-optic material. It forms tetragonal crystals.
Tellurium dioxide is also a conditional glass former, which means it will form a glass with small molar % additions of a second compound such as an oxide or halide. TeO2 glasses have high refractive indices and transmit into the mid-infrared part of the electromagnetic spectrum, therefore they are of technological interest for optical waveguides. Tellurite glasses have also been shown to exhibit Raman gain up to 30 times that of silica, useful in optical fibre amplification.
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[edit] Chemical properties
TeO2 is the main product of burning tellurium in air. TeO2 is highly insoluble in water and completely soluble in concentrated sulfuric acid. It is also incompatible with strong acids and strong oxidizing agents. It is an amphoteric substance and therefore can act both as an acid or as a base depending on the solution it is in.
[edit] Safety Information
TeO2 is a possible teratogen. Harmful, and produces a garlic-like odour on the breath.
[edit] External links
- Moltech Berlin
- Mоscow State University
- Maternal toxicity and teratogenicity of tellurium dioxide in the Wistar rat: relationship to pair-feeding. Perez-D'Gregorio RE, Miller RK, Baggs RB. Reprod Toxicol. 1988;2(1):55-61.
- J. S. Wang, E. M. Vogel and E. Snitzer "Tellurite glass: a new candidate for fiber devices" Opt. Mat. 3 (3) 187-203 1994
- TeO2 MSDS
- R. Stegeman, L. Jankovic, H. Kim, C. Rivero, G. Stegeman, K. Richardson, P. Delfyett, Y. Guo, A. Schulte, T. Cardinal "Tellurite glasses with peak absolute Raman gain coefficients up to 30 times that of fused silica" Opt. Lett. 28 (13) 1126-1128 2003
[edit] References
K. W. Bagnall, The Chemistry of Selenium, Tellurium and Polonium, pp 59-60, Elsevier, London, 1966.
