[time-nuts] Better quartz crystals with single isotope ?

[Bob kb8tq]

Hi


> On Apr 22, 2018, at 12:19 PM, Poul-Henning Kamp <phk at phk.freebsd.dk> 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 ?

You could put it on the list with the 1 Kg quartz resonator proposal …..

https://tf.nist.gov/general/pdf/2638.pdf <https://tf.nist.gov/general/pdf/2638.pdf>

Also an offshoot of people thinking about the implications of all this as it relates to resonators.


Bob


> 
> Poul-Henning
> 
> -- 
> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> phk at FreeBSD.ORG         | TCP/IP since RFC 956
> FreeBSD committer       | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by incompetence.
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