In chemistry, the term stannate or tinnate refers to compounds of tin (Sn). Stannic acid (Sn(OH)<sub>4</sub>), the formal precursor to stannates, does not exist and is actually a hydrate of SnO<sub>2</sub>. 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. K<sub>4</sub>SnO<sub>4</sub>) or have a spinel structure (e.g. Mg<sub>2</sub>SnO<sub>4</sub>)
- metastannates with a stoichiometry M<sup>II</sup>SnO<sub>3</sub>, MSnO<sub>3</sub> which may contain polymeric anions or may be sometimes better described as mixed oxides
These materials are semiconductors.
Examples
- Barium stannate, BaSnO<sub>3</sub> (a metastannate)
- Cobalt stannate, Co<sub>2</sub>SnO<sub>4</sub>, primary constituent of the pigment cerulean blue
- Dysprosium stannate, Dy<sub>2</sub>Sn<sub>2</sub>O<sub>7</sub>
- Lead stannate, Pb<sub>2</sub>SnO<sub>4</sub>, "Type I" lead-tin yellow
- Potassium stannate, formally potassium hexahydroxostannate(IV), formula K<sub>2</sub>Sn(OH)<sub>6</sub>
- Sodium stannate, formally sodium hexahydroxostannate(IV), formula Na<sub>2</sub>Sn(OH)<sub>6</sub>
See also
References