Hello Bob,
Do you, or does any one in the forum, know of the original references /
publication
with those characterizations of tin transformations?
I often hear or read similar numbers in text books etc...: 1) 13.2C for where
it starts; 2) -40C for the maximum rate (sometimes given as -30C, again
without references).
There are many anecdotal stories as well, however, I have not been able to
find the original technical studies on tin and experimental conditions being
referenced to.

Thanks for your help,
Jean-Paul

In a message dated 7/1/2004 7:21:32 PM Eastern Standard Time,
[log in to unmask] writes:
The allotropic transformation of tin, tin pest, occurs at 13 C.  However, at
this temperature, the conversion time is exceedingly long (decades).
Various experiments have been performed to accelerate the transformation
process.  In general, -40 C is considered the temperature at which
transformation occurs the fastest.  At this temp, transformation can be a
matter of days or decades depending on the factors you mentioned below.
Note that transformation is also highly accelerated if alpha tin already
exists or another material with the same structure as alpha tin is present.

_______________________________________
J-P. Clech
EPSI Inc.
P. O. Box 1522, Montclair, NJ 07042, USA
tel.: +1 (973)746-3796; fax: +1 (973)655-0815
Web: http://jpclech.com/

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