[time-nuts] Quartz Crystal Motional Movement

[Hal Murray]

> The highest Q I remember seeing were BVA's that reached 2e6 to 3e6 @ 5MHz

What determines the Q of a crystal?  Is it atomic level impurities?  Crystal 
defects?  ...

How has that changed over time?  Is there a Moore's law for crystals?

How does the quality of crystals used for timing compare to the crystals used 
for semiconductors?

Are there any other economically significant uses of high quality crystals?


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