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TELLURIUM DIOXIDE

CAS NO.: 7446-07-3
EC/LIST NO.: 231-193-1

Tellurium dioxide (TeO2) is a solid oxide of tellurium.
Tellurium dioxide is encountered in two different forms, the yellow orthorhombic mineral tellurite, β-TeO2, and the synthetic, colourless tetragonal (paratellurite), α-TeO2.
Most of the information regarding reaction chemistry has been obtained in studies involving paratellurite, α-TeO2.

Tellurium Dioxide, has the symbol TeO2 is a solid oxide of tellurium.
Tellurium dioxide was first discovered by Franz-Joseph Muller von Reichenstein, but it was Martin Heinrich Klaproth who named the element in 1798 after the Latin word for “earth”, Telus.
Tellurium dioxide is encountered in two different forms, the yellow orthorhombic mineral tellurite, and the synthetic, colorless tetragonal (paratellurite).

Tellurium dioxide is sometimes used to color ceramics.
Tellurium dioxide has increasingly been used in optical refraction applications such as fiber optics and complimentary products.
Because of its unique characteristics tellurium dioxide is an integral part of acousto-optic products as well as having good diffraction efficiency and it works very well at most power levels.
Tellurium dioxide is even capable of being used for high speed or high resolution devices that need to handle high laser powers.

Tellurium Dioxide will remain the in the domain of specialized applications in the near future with anti-corrosive materials especially in batteries, conditional glass formers, and specifically in the acousto- optic materials and products.
As science develops more efficiencies and breakthroughs, it is very encouraging to see how it can extend the reach of fiber optics above and beyond any current constraints.
These new may increase the demand for high purity tellurium dioxide.

Tellurium Oxide (or Tellurium Dioxide) is thermally stable Tellurium source suitable for glass, optic and ceramic applications.
Oxide compounds are not conductive to electricity.
However, certain perovskite structured oxides are electronically conductive finding application in the cathode of solid oxide fuel cells and oxygen generation systems.
They are compounds containing at least one oxygen anion and one metallic cation.
They are typically insoluble in aqueous solutions (water) and extremely stable making them useful in ceramic structures as simple as producing clay bowls to advanced electronics and in light weight structural components in aerospace and electrochemical applications such as fuel cells in which they exhibit ionic conductivity.
Metal oxide compouHigh Purity (99.999%) Tellurium Oxide (TeO<sub>2</sub>) Powdernds are basic anhydrides and can therefore react with acids and with strong reducing agents in redox reactions.
Tellurium Oxide is also available in pellets, pieces, powder, sputtering targets, tablets, andnanopowder (from American Elements' nanoscale production facilities).
American Elements produces to many standard grades when applicable, including Mil Spec (military grade); ACS, Reagent and Technical Grade; Food, Agricultural and Pharmaceutical Grade; Optical Grade, USP and EP/BP (European Pharmacopoeia/British Pharmacopoeia) and follows applicable ASTM testing standards.
Typical and custom packaging is available.
Tellurium Oxide is generally immediately available in most volumes.
High purity, submicron and nanopowder forms may be considered.
American Elements produces to many standard grades when applicable, including Mil Spec (military grade); ACS, Reagent and Technical Grade; Food, Agricultural and Pharmaceutical Grade; Optical Grade, USP and EP/BP (European Pharmacopoeia/British Pharmacopoeia) and follows applicable ASTM testing standards.
Typical and custom packaging is available.
Additional technical, research and safety (MSDS) information is available as is a Reference Calculator for converting relevant units of measurement.

Tellurium(IV) oxide is also used in devices which can convert light into sound (acousto-optic material). Glasses made of tellurium oxide have high refractive indices and transmit into mid-IR region. It is used to make glasses with special properties. It is useful in optical waveguides and optical fiber amplification.

Tellurium dioxide is used to fabricate fiber optics and pigments and to color ceramics and glass.

Aurubis is one of the world’s largest producers of high-quality tellurium.
Tellurium dioxide is recovered from a variety of primary and secondary raw materials.
Through the production processes in our copper smelters, we ensure a continuous supply of tellurium metal and tellurium dioxide.

Furthermore, both tellurium metal and tellurium dioxide from Aurubis fulfill the REACH requirements.

Tellurium dioxide (TeO2 or paratellurite) is a solid oxide of tellurium.
Tellurium dioxide is used as an acousto-optic material.
Tellurium dioxide 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.
Tellurium dioxide 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.
Tellurium dioxide have also been shown to exhibit Raman gain up to 30 times that of silica, useful in optical fibre amplification.

Tellurium dioxide is the main product of burning tellurium in air.
Tellurium dioxide is highly insoluble in water and completely insoluble in concentrated sulfuric acid.
Tellurium dioxide is also incompatible with strong acids and strong oxidizing agents.
Tellurium dioxide is an amphoteric substance and therefore can act both as an acid or as a base depending on the solution it is in.

Rare element Tellurium (Te) is known as a nonessential toxic element and its biological function has not been described comprehensively yet.
Wide spectrum areas show interest in nanoparticles because of their unusual biological features and use in different commercial products.
In this research, tellurium dioxide nanoparticle (TeO2 NP) which is an important material for industrial areas including biomedical applications was analysed on cultured Human Pulmonary Alveolar Epithelial (HPAEpiC) and peripheral blood cells.
For this purpose, TeO2 NPs size and content were confirmed and characterized via using X-ray crystallography (XRD) and Scanning Electron Microscope (SEM) techniques.
Cell viability was determined by 3-(4, 5-dimethyl-thiazol-2-yl) 2, 5-diphenyltetrazolium bromide (MTT) and Lactate Dehydrogenase (LDH) release assays.
Also, TeO2 NPs were investigated on the cell cultures in the aspect of Total Antioxidant Capacity (TAC) and Total Oxidative Stress (TOS) levels.
The TAC values did not change but, The TOS values significantly increased for the cell cultures after TeO2 NPs application.
According to cell viability assays, 160 mg/l concentration of TeO2 NPs was found to be highly toxic for both cell cultures.
In the light of these findings, it could be inferenced that TeO2 NPs is immensely cytotoxic for different cell types and toxicity process might occur through oxidative stress mechanism.

Tellurium Dioxide Crystal (TeO2) is one of the best Acousto-Optic crystals even grown, and extensively used in AO modulators, deflectors, AO tunable filters (AOTFs), laser Q-switches, RF spectrum analyzers.
United Crystals provides various laser-grade Tellurium Dioxide devices.

Tellurium dioxide and TeO2 doped by Eu thin films manufactured by magnetron sputtering method were measured by optical spectroscopy.
Metallic Te target and Te-Eu mosaic target with diameter of 50.8 mm were sputtered for about 45 min in argon-oxygen atmosphere what resulted in 300 nm film thickness deposition.
The pressure in the chamber was below 0.2 Pa and substrate was heated at 200 oC.
The distance between sputtered targets and the Corning 1737 glass substrate was about 10 cm.
Optical transmission characteristics were recorded with Evolution 220 UV-Visible Spectrophotometer in a range of 250 nm –1100 nm.
UV-VIS measurements showed high transparency of films.
Optical properties, such as optical band gap were calculated on the basis of measurements.

Tellurium Dioxide powders in 99.99% and 99.999% purities.
Tellurium dioxide powders are used for growing TeO2 single crystal or making acousto-optic material.
Tellurium dioxide is a conditional glass former and can be used as additive for semiconductor part, conductive paste and electroplating solution.

Tellurium dioxide, also known as tellurium oxide (TeO2), is a white powder.
Our Tellurium dioxide is produced with minimally sized grains and the highest possible density.
Tellurium dioxide is used for deposition and evaporation processes and in applications requiring high surface areas.
Tellurium dioxide is highly insoluble to water, however, it is soluble in concentrated sulfuric acid and reacts with acids to make tellurium salts.

Paratellurite, α-TeO2, is produced by reacting tellurium with O2:

Te + O2 → TeO2

An alternative preparation is to dehydrate tellurous acid, H2TeO3, or to thermally decompose basic tellurium nitrate, Te2O4·HNO3, above 400 °C.

TeO2 is barely soluble in water and soluble in strong acids and alkali metal hydroxides.
Tellurium dioxide is an amphoteric substance and therefore can act both as an acid or as a base depending on the solution it is in.
Tellurium dioxide reacts with acids to make tellurium salts and bases to make tellurites.
Tellurium dioxide can be oxidized to telluric acid or tellurates.

Paratellurite, α-TeO2, converts at high pressure into the β-, tellurite form.
Both the α-, (paratellurite) and β- (tellurite forms) contain four coordinate Te with the oxygen atoms at four of the corners of a trigonal bipyramid.
In paratellurite all vertices are shared to give a rutile-like structure, where the O-Te-O bond angle are 140°.
α-TeO2 In tellurite pairs of trigonal pyramidal, TeO4 units, sharing an edge, share vertices to then form a layer.
The shortest Te-Te distance in tellurite is 317 pm, compared to 374 pm in paratellurite.
Similar Te2O6 units are found in the mineral denningite.

TeO2 melts at 732.6 °C, forming a red liquid.
The structure of the liquid, as well as the glass which can be formed from it with sufficiently rapid cooling, are also based on approximately four coordinate Te.
However, compared to the crystalline forms, the liquid and glass appear to incorporate short-range disorder (a variety of coordination geometries) which marks TeO2 glass as distinct from the canonical single-oxide glass-formers such as SiO2, which share the same short-range order with their parent liquids

CAS number : 7446-07-3
EC number : 231-193-1
Hill Formula : O₂Te
Chemical formula : TeO₂
Molar Mass : 159.6 g/mol
HS Code : 2811 29 90

Boiling point   : 1245 °C (1013 hPa)
Density   : 5.670 g/cm3
Melting Point   : 733 °C

Tellurium dioxide is used as an acousto-optic material.

Tellurium dioxide is also a reluctant glass former, it will form a glass under suitable cooling conditions, or with small molar% additions of a second compound such as an oxide or halide.
Tellurium dioxide 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.
Tellurium dioxide have also been shown to exhibit Raman gain up to 30 times that of silica, useful in optical fibre amplification.

Tellurium dioxide is also used in devices which can convert light into sound (acousto-optic material).
Glasses made of tellurium oxide have high refractive indices and transmit into mid-IR region.
Tellurium dioxide is used to make glasses with special properties.
Tellurium dioxide is useful in optical waveguides and optical fiber amplification

Tellurium dioxide is used to prepare tellurium metal, telluric acid, and many tellurium salts.
Tellurium dioxide may also be used in the preparation of Ag2Te nanoparticles.

Used to manufacture acousto-optic materials, infrared devices, and infrared window materials.
Used for fuel cell and solar applications.
Used as a conditional glass former.
Applied as a preservative.

IUPAC NAME:

(oxo-lambda4-tellanyl)one

oxotellane oxide

Tellurium Dioxide

Tellurium dioxide

tellurium dioxide

SYNONYMS:

231-193-1
7446-07-3
MFCD00011263
Oxotellane oxide
Oxotellanoxid
Oxyde de oxotellane
Tellane, oxo-, oxide
TELLURIUM DIOXIDE
TELLURIUM(IV) OXIDE
WY2675000