In chemistry the term stannate refers to compounds of
tin
Tin is a chemical element with the symbol Sn (from la, stannum) and atomic number 50. Tin is a silvery-coloured metal.
Tin is soft enough to be cut with little force and a bar of tin can be bent by hand with little effort. When bent, t ...
(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. K
4SnO
4) or have a
spinel
Spinel () is the magnesium/aluminium member of the larger spinel group of minerals. It has the formula in the cubic crystal system. Its name comes from the Latin word , which means ''spine'' in reference to its pointed crystals.
Properties
S ...
structure (e.g. Mg
2SnO
4)
*''metastannates'' with a stoichiometry M
IISnO
3, MSnO
3 which may contain polymeric anions or may be sometimes better described as mixed oxides
These materials are
semiconductor
A semiconductor is a material which has an electrical resistivity and conductivity, electrical conductivity value falling between that of a electrical conductor, conductor, such as copper, and an insulator (electricity), insulator, such as glas ...
s.
["Preparation, characterization and structure of metal stannates: a new family of photocatalysts for organic pollutants degradation." ''Handbook of Photocatalysts'' (2010), pp. 493–510. ]Nova Science Publishers, Inc.
Nova Science Publishers is an academic publisher of books, encyclopedias, handbooks, e-books and journals, based in Hauppauge, New York. It was founded in 1985. A prolific publisher of books, Nova has received criticism from librarians for not ...
, Hauppauge, NY
Examples
* Barium metastannate (BaSnO
3)
* Cobalt stannate (Co
2SnO
4), primary constituent of the pigment
cerulean blue
* Dysprosium stannate (Dy
2Sn
2O
7)
* Potassium stannate (formally potassium hexahydroxostannate(IV), formula K
2Sn(OH)
6)
* Sodium stannate (formally sodium hexahydroxostannate(IV), formula Na
2Sn(OH)
6)
See also
*
Stannite
References
Oxometallates
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