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. The term is also used in naming conventions as a suffix; for example the hexachlorostannate ion is SnCl6(−2.
In materials science, two kinds of tin oxyanions are distinguished:
- orthostannates contain discrete SnO44− units (e.g. K4SnO4) or have a spinel structure (e.g. Mg2SnO4)
- metastannates with a stoichiometry MIISnO3, MI
2SnO3 which may contain polymeric anions or may be sometimes better described as mixed oxides
These materials are semiconductors.
01Examples
- 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
- Zinc Stannate, formula ZnSnO3, used as a flame retardant additive for polymers.
- Sodium stannate, formally sodium hexahydroxostannate(IV), formula Na2Sn(OH)6
Sources and credits
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