On Mar 13, 2009, at 11:37 AM, Jed Rothwell wrote:
Stephen A. Lawrence wrote:
Does Johnson-Matthey "Type A" palladium still work?
Fleischmann and I do not know. The manufacturing method was changed
sometime after 1989 to reduce toxicity during manufacturing. The
newer formulation probably works.
Note that "Type A" is Fleischmann's designation for the palladium
alloy made by Johnson Matthey for use in hydrogen filters. It was
developed in the 1930s. When Fleischmann & Pons began experimental
work on cold fusion, Fleischmann called Johnson Matthey, explain
what he wanted to do and ask them to recommend what type of
palladium to use. They recommended this type, for obvious reasons.
You can see the performance of this type of palladium compared to
other types in Table 10, p. 44 of this document:
http://lenr-canr.org/acrobat/MilesManomalousea.pdf
What Fleischmann calls Type A is referred to here as "M (F/P) Pd,"
and I think "P/F) Pd."
Researchers at BARC used an actual hydrogen filter machine with the
palladium in place to successfully replicate cold fusion in 1989.
A problem exists with respect to Type A Pd, which is claimed to be
used for gas purification. However, only the Pd075Ag25 alloy is used
for this purpose because this alloy, unlike pure Pd, does not crack
upon reacting with H2. Nevertheless, Fleischmann claimed the Type A is
pure Pd. The Pd in the hydrogen generator used by BARC was the Pd-Ag
alloy. Fleischman also used cathodes identified as being the Pd-Ag
alloy and claimed good success. The confusion lies in what Type A Pd
is really made of.
Ed
