Stannate

Short description: Ion

In chemistry, the term stannate or tinnate refers to compounds of tin (Sn). Stannic acid (Sn(OH)4), the formal precursor to stannates, does not exist and is actually a hydrate of SnO2.[1] The term is also used in naming conventions as a suffix; for example the hexachlorostannate ion is SnCl2−6.

In materials science, two kinds of tin oxyanions are distinguished:

* orthostannates contain discrete SnO4−4 units (e.g. K4SnO4) or have a spinel structure (e.g. Mg2SnO4)
* metastannates with a stoichiometry MIISnO3, MI2SnO3 which may contain polymeric anions or may be sometimes better described as mixed oxides

These materials are semiconductors.[2]

## Examples

* Barium stannate, BaSnO3 (a metastannate)
* Cobalt stannate, Co2SnO4, primary constituent of the pigment cerulean blue
* Dysprosium stannate, Dy2Sn2O7
* Lead stannate, Pb2SnO4, "Type I" lead-tin yellow
* Potassium stannate, formally potassium hexahydroxostannate(IV), formula K2Sn(OH)6
* Sodium stannate, formally sodium hexahydroxostannate(IV), formula Na2Sn(OH)6

## See also

* Stannite
* Silicate

## References

1. ↑ Holleman, Arnold Frederik; Wiberg, Egon (2001), Wiberg, Nils, ed., Inorganic Chemistry, San Diego/Berlin: Academic Press/De Gruyter, ISBN 0-12-352651-5
2. ↑ "Preparation, characterization and structure of metal stannates: a new family of photocatalysts for organic pollutants degradation." Handbook of Photocatalysts (2010), pp. 493–510. Nova Science Publishers, Inc., Hauppauge, NY

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