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Atomistry » Tin » Physical Properties » Grey Tin | ||||
Atomistry » Tin » Physical Properties » Grey Tin » |
Grey Tin
In 1851 O. L. Erdmann discovered organ-pipes covered with warty excrescences which developed into holes owing to the conversion of the tin into a grey powder. Similar observations have been repeatedly made. Aristotle speaks of tin "melting" at low temperature; and bars of tin kept at Petrograd and Moscow during severe winters have been found covered with a grey powder owing to what has been called "tin-pest"; whilst coins and utensils made of tin, preserved in museums, have developed spots upon their surfaces owing to the contraction of "museum-sickness"! The cause of this behaviour of tin has been investigated by Cohen and van Eijk, who have shown that tin is enantiotropic - that is, it exists in two allotropic modifications which change the one into the other with change of temperature according to the scheme:
grey tin ⇔ white tin.
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