Stannate

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, MI
    2    SnO3 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, translated by Eagleson, Mary; Brewer, William, 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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