Interesting indeed! Seems as if there ought to be info about drawing
crystals mono vs poly isotopic somewhere out there. Also some info about
crystal grain boundaries that might be generated in a zone furnace
drawing by isotope inclusions. Seems the boundaries are responsible for
the sudden frequency shifts? My solid state physics is evanescent, but
there ought to be a TN with some info...
Don
On 2018-04-22 10:19, Poul-Henning Kamp wrote:
Silicon comes in a number of isotopes but 95% of it is Silicon-28.
When you make pure mono-crystaline silicon, you get 50-60% better
thermal conductivity if you only use Silicon-28 atoms.
Yes, you read that right: 50-60% improvement for removing the
remaining 5% other silicon isotopes, and for this and other reasons,
sorting silicon atoms by isotope is now a thing, which amongst other
side effects have made the Advogardo Project possible.
I can't help wonder if there may be similar interesting effects in
quartz crystals, if they were monoisotopic ?
Several relevant mechanisms can be imagined, lower internal damping,
higher stiffness etc. etc.
We know a LOT about quartz and have a very good theory for its
behaviours, but i find no signs anybody has ever touched monoisotopic
Quartz.
The obvious experiment is not rocket-science, nor does it demand
inordinate resources for amateurs, see for instance from 03:35:
https://archive.org/details/59554KrystallosCF
But it is clearly beyond what I have time to persue.
Do we know anybody in the quartz business who needs a really cool
research project ?
Poul-Henning
--
Dr. Don Latham
PO Box 404, Frenchtown, MT, 59834
VOX: 406-626-4304
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