[time-nuts] Quartz crystal aging and applied voltage

Bob Camp lists at rtty.us
Mon Jul 1 20:46:48 EDT 2013


Hi

There's a gotcha with trying to anneal quartz. If you take it above the Curie temperature, it'll twin when it comes back down. You will have random right and left handed domains in the bar. Net result is that you can't get it hot enough to "heal" any imperfections.

Bob

On Jul 1, 2013, at 3:57 PM, Attila Kinali <attila at kinali.ch> wrote:

> On Sun, 30 Jun 2013 19:04:18 -0400
> Bob Camp <lists at rtty.us> wrote:
> 
>>> Thanks Bob for the extra insight. The way sweeping works, won't a number
>> of additional runs help to re-melt the crystal and help "ironing out" the
>> dislocations in the crystal?
>> 
>> That's not the way it's done. One pass under bias, pull the ions to the
>> edges. Cut off the edges. If you re-melt and re-grow the crystal you get a
>> whole new batch of ions from the growing process.
> 
> I assumed that Magnus didn't actually mean melting the crystal, but
> an anealing process to fix the defects in the lattice.
> 
> 			Attila Kinali
> 
> -- 
> The people on 4chan are like brilliant psychologists
> who also happen to be insane and gross.
> 		-- unknown
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