Tellurium dioxide (TeO₂ or paratellurite) is a solid oxide of tellurium. It is used as an acousto-optic material. It forms tetragonal crystals. A chemical formula (also called molecular formula) is a concise way of expressing information about the atoms that constitute a particular chemical compound. ... Molar mass is the mass of one mole of an element or chemical compound. ... CAS registry numbers are unique numerical identifiers for chemical compounds, polymers, biological sequences and alloys. ... Density (symbol: ρ - Greek: rho) is a measure of mass per unit of volume. ... A solvent is a liquid that dissolves a solid, liquid, or gaseous solute, resulting in a solution. ... Water has the chemical formula H2O, meaning that one molecule of water is composed of two hydrogen atoms and one oxygen atom. ... The melting point of a solid is the temperature at which it changes state from solid to liquid. ... The boiling point of a substance is the temperature at which it can change state from a liquid to a gas throughout the bulk of the liquid. ... An oxide is a chemical compound of oxygen with other chemical elements. ... General Name, Symbol, Number tellurium, Te, 52 Chemical series metalloids Group, Period, Block 16, 5, p Appearance silvery lustrous gray Atomic mass 127. ... In crystallography, the tetragonal crystal system is one of the 7 lattice point groups. ...

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. The refractive index of a material is the factor by which electromagnetic radiation is slowed down (relative to vacuum) when it travels inside the material. ... Image of a small dog taken in mid-infrared (thermal) light (false color) Infrared (IR) radiation is electromagnetic radiation of a wavelength longer than visible light, but shorter than microwave radiation. ... The electromagnetic spectrum is the range of all possible electromagnetic radiation. ... An optical waveguide is a form of a dielectric waveguide, that is capable of guiding an optical signal. ... The chemical compound silicon dioxide, also known as silica, is the oxide of silicon, chemical formula SiO2. ... Fiber Optic strands An optical fiber in American English or fibre in British English is a transparent thin fiber for transmitting light. ...

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. A substance is soluble in a fluid if it dissolves in the fluid. ... // Headline text Bold textBold textBold text:This article focuses on water as it is experienced in everyday life. ... Sulfuric acid (British English: sulphuric acid), H2SO4, is a strong mineral acid. ... An acid (often represented by the generic formula AH) is typically a water-soluble, sour-tasting chemical compound. ... An oxidizing agent is a substance that [oxidizes] another substance in electrochemistry or redox chemical reactions in general. ...

Safety Information

TeO₂ is a possible teratogen. Harmful, and produces a garlic-like odour on the breath. Teratogenesis is a medical term from the Greek, literally meaning monster making. ...

Sources

• redoptronics
• sciner

External Links

• Moltech Berlin
• Minsk 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

References

K. W. Bagnall, The Chemistry of Selenium, Tellurium and Polonium, pp 59-60, Elsevier, London, 1966. http://www.reade.com/Products/Oxides/tellurium_oxide.html 2005.