Stannate
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 SnCl2โ
6.
In materials science, two kinds of tin oxyanions are distinguished:
- orthostannates contain discrete SnO4โ
4 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.[2]