Most calorimetric data appears to be confined to lower temperatures somewhere a little in excess of the alpha to beta transition but I can't find higher temperature data.
Perhaps a dumb remark, but shouldn't you be looking at data for tridymite at that temperature?
That's a good point Marlina! But I think that even at low pressures quartz can remain metastable up to these temperatures. Provisional measurements I have performed confirm that beta quartz transitions directly to beta cristobalite at around 1020-1050 C. Any idea where other measurements of this type might be found?
You're quite right, and I was indeed vaguely wondering whether you were talking about disequilibrium processes - or that you simply missed the existence of tridymite (I have clearly been doing too much undergraduate teaching that I entertained this option). So your question is a good one, to which I unfortunately do not know the answer!
Hi Marlina,
Just a note to say I have now measured this region of temperature using quartz. I find no transition to tridyimite even at low heating rates (lots of time for equilibration).
All the best,
Fabian
Interesting! Perhaps it is support for the idea that nothing ever happens when there isn't a fluid present.
Cheers,
Marlina
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