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

I always thought crystals with dislocations were used to mark the band edge frequencies. ... MartinVE3OAT - - - - - - - - - - - - - - - - - - On Sun, 22 Apr 2018 11:34:30 -0600 djl wrote : > > Darn. maybe not grain boundaries, but dislocations? or both? > Don > - - - - - - - - - - - - - -

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

hard > (Rick) Karlquist > Sent: Sunday, April 22, 2018 4:11 PM > To: Discussion of precise time and frequency measurement; Bob kb8tq > Subject: Re: [time-nuts] Better quartz crystals with single isotope ? > > On 4/22/2018 10:20 AM, Bob kb8tq wrote: > >>> Do

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

bro...@pacific.net said: > Isotopes of an element differ in the number of neutrons.  The chemical > reactions of an element are governed by the electrons, which are the same > for all isotopes, so chemical means can not be used to separate the > isotopes. That needs a qualification, maybe

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

of precise time and frequency measurement; Bob kb8tq Subject: Re: [time-nuts] Better quartz crystals with single isotope ? On 4/22/2018 10:20 AM, Bob kb8tq wrote: >> Do we know anybody in the quartz business who needs a really cool >> research project ? > > You could put it on the

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

Hi Quartz ball yes. It’s a fused quartz (as opposed to crystalline quartz) ball ….. Fused quartz is a lot easier to work with. In order to be piezoelectric, it must be crystalline. The piezo properties are what lets you make a resonator out of it. Bob > On Apr 22, 2018, at 6:28 PM, Brooke

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

Hi: I found a perfect quartz ball.  It took Stanford many decades to make it. https://einstein.stanford.edu/TECH/technology1.html -- Have Fun, Brooke Clarke http://www.PRC68.com http://www.end2partygovernment.com/2012Issues.html Original Message Hi: Isotopes of an element

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

Hi If you get into “temperature nuts” territory, the triple point of water varies with the isotope “mix” in the standard. The “correct” mix turns out to be “mid continent deep well water”. If you make a resonator that is very thick, you also need to make it very wide. If you don’t, the

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

On 4/22/2018 10:20 AM, Bob kb8tq wrote: 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 Also an

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

Hi: Isotopes of an element differ in the number of neutrons.  The chemical reactions of an element are governed by the electrons, which are the same for all isotopes, so chemical means can not be used to separate the isotopes. There are a number of ways of making the separation, for Uranium

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

Hi > On Apr 22, 2018, at 1:46 PM, jimlux 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

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

Darn. maybe not grain boundaries, but dislocations? or both? 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

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

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

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

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

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

Hi > On Apr 22, 2018, at 12:19 PM, 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