Stannate

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 M^IISnO₃, M^I
  ₂SnO₃ which may contain polymeric anions or may be sometimes better described as mixed oxides

These materials are semiconductors.

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
• Zinc Stannate, formula ZnSnO₃, used as a flame retardant additive for polymers.
• Sodium stannate, formally sodium hexahydroxostannate(IV), formula Na₂Sn(OH)₆

See also

• Stannite
• Silicate

References

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