Hi > On Apr 22, 2018, at 1:46 PM, jimlux <[email protected]> wrote: > > On 4/22/18 9:19 AM, 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 > > > A note the cigarette in the guy's hand - trace contaminants probably increase > the yield <grin> > > I've looked into "garage manufacture" of crystals, although I was looking > more at Cr and Ti doped alumina. The movie looks like it's using the > "solution" approach (which has also been used to grow synthetic emeralds) > which is similar to how it happens in nature. These days, I wonder whether > continuous pulling from a melt like silicon boules might not be a better > strategy.
If you are after a quartz crystal, pulling is not an option. You grow them from solution under high pressure and moderate temperature. Bob > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
