A tellurite tellurate is chemical compound or salt that contains

tellurite The tellurite ion is . A tellurite (compound), for example sodium tellurite, is a compound that contains this ion. They are typically colorless or white salts, which in some ways are comparable to sulfite. A mineral with the formula TeO2 is ...

and

tellurate In chemistry tellurate is a compound containing an oxyanion of tellurium where tellurium has an oxidation number of +6. In the naming of inorganic compounds it is a suffix that indicates a polyatomic anion with a central tellurium atom.

anion An ion () is an atom or molecule with a net electrical charge. The charge of an electron is considered to be negative by convention and this charge is equal and opposite to the charge of a proton, which is considered to be positive by convent ...

s eO₃sup>2- eO₄ sup>2-. These are

mixed anion compounds Mixed anion compounds, heteroanionic materials or mixed anion materials are chemical compounds containing cations and more than one kind of anion. The compounds contain a single phase, rather than just a mixture. Use in materials science By havin ...

, meaning the compounds are cations that contain one or more anions. Some have third anions. Environmentally, tellurite eO₃sup>2- is the more abundant anion due to tellurate's eO₄ sup>2- low solubility limiting its concentration in biospheric waters. Another way to refer to the anions is tellurium's oxyanions, which happen to be relatively stable.

Naming

A tellurite tellurate compound may also be called a tellurate tellurite. Compounds that contain the anions follow basic nomenclature rules, the cation is named first, followed by the anion. As individual ions current IUPAC naming conventions dictate that compounds containing what was conventionally known as the tellurite ion, eO₃sup>2-, be named as tellurate (IV) compounds, while other tellurates are labeled tellurate (VI) compounds. Furthering confusion, a number of other tellurate oxyanions exist, including pentoxotellurate, eO₅sup>4-, and ditellurate, e₂O₁₀sup>8-. Additionally, a number of compounds that do not even include tellurium oxyanions still have "tellurate" in their names, as in the case of octafluoridotellurate, eF₈sup>2-.

Production

One way to produce a tellurite tellurate compound is by heating oxides together. Tellurite tellurate compounds can also occur naturally as minerals such as

Carlfriesite Carlfriesite is a rare tellurium mineral with the formula Ca Te4+2 Te6+ O8, or more simplified: CaTe3O8. It has a Moh's hardness of 3.5 and it occurs in various shades of yellow, ranging from bright yellow to a light buttery color. It was named ...

Ca e⁴⁺₂Te⁶⁺O₈

Properties

Tellurite tellurate compounds can crystalize under certain conditions. Monoclinic and orthorhombic dominate crystal structures of the tellurite tellurates. Most compounds are transparent from near ultraviolet to the near infrared. Te-O bonds cause absorption lines in infrared. Sodium tellurite exhibit

Related to these are the selenate selenites and

sulfate sulfite A sulfite sulfate is a chemical compound that contains both sulfite and sulfate anions O3sup>2− O4sup>2−. These compounds were discovered in the 1980s as calcium and rare earth element salts. Minerals in this class were later discovered. Min ...

s by varying the chalcogen.

List

References

{{Tellurites Tellurates Tellurites Mixed anion compounds Mixed valence compounds