Undetermined origin c/o LISTSERV administrator on tue 20 jan 04
Dear Friends,
There is a simple way to settle this matter which would address the =
degree to which Chromium Sesquioxide volatilises or evaporates or =
sublimes. Do the tests which would allow the loss of mass to be =
measured. (See P. J. Durrant "General and Inorganic Chemistry", 2nd, Ed =
1952. Longmans. Page 319 and read the footnote for a comparable =
experiment.)
Most universities will have a department of analytical chemistry with =
balances capable of finding masses to within one milligram at an =
accuracy of +/- ten micrograms. they will also have Platinum Crucibles =
which are inert and will not interfere with the Chromium Sesquioxide. =
All that needs be done is to put a sample of known mass into the =
crucible of known mass, subject the test specimen to both neutral and =
reduction firings with a flow of air passing over the set up and =
calculate the mass differences when things cool down again. The =
difference between the before and the after weighing's will tell us how =
much during that temperature cycle.
Doubters may wish to contemplate where hundreds of tons of raw Chromium =
Sesquioxide are used everyday at temperatures well in excess of those =
used by potters and ceramic artists. Would this be because of its =
refractory properties, it's lack of reactivity, or even because it seems =
to be insoluble in molten silicate systems at the temperature of =
operations where it is employed ?
Best regards and a Happy New Year of the Monkey,
Ivor Lewis. Redhill, South Australia
(Please copy and paste the term Chromium Sesquioxide if you're going to =
respond rather than being idle and just writing "chrome")=20
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