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.

In materials science, two kinds of tin oxyanions are distinguished:
 * orthostannates contain discrete units (e.g. K4SnO4) or have a spinel structure (e.g. Mg2SnO4)
 * metastannates with a stoichiometry MIISnO3, M$I 2$SnO3 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
 * Sodium stannate, formally sodium hexahydroxostannate(IV), formula Na2Sn(OH)6