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In Reply to: Re: Molecular Structure posted by geoffkait on November 28, 2002 at 03:05:02:
""Seems to be that the molecular structure (after treatment) is simply more homogeneous, not more tightly aligned; the molecules are compressed during cooling then during warmup the material undergoes expansion such that the molecules expand like raisins in dough when cooking in the oven; this expansion results in a more uniform distribution of the molecules.""It may be that the lattice structure has changed. FCC to BCT or BCC for example. That would require x-ray diffraction studies to confirm. There is also the possibility that the molecular arrangement of the metal is unchanged. Martensite formation in steel would contradict that. Unknown what silver, copper do.
""The molecular structure, at least in part, was non-uniform to begin with because the manufacturing processes such as stamping, drawing, rolling, cutting, etc. cause gross irregularites in the molecular structure of the materials - "clumping," "stretching," whatever...""Agreed. With supers, we rely on that for creation of pinning sites to stop magnetic flux creepage. Makes for better superconductor performance.
Cheers, John
Follow Ups:
The (sonic) performance of plastics appears quite improved by cryo treatment, even simple freezing, and many metals - copper, silver, steel, aluminum, gold, brass, as well as glass and whatever metals are used in electron tubes, there may be some things going on with these audio apps not documented; hard to pinpoint the mechanism/cause, not hard at all to "prove" the effect...
""The (sonic) performance of plastics appears quite improved by cryo treatment, even simple freezing, and many metals - copper, silver, steel, aluminum, gold, brass, as well as glass and whatever metals are used in electron tubes, there may be some things going on with these audio apps not documented; hard to pinpoint the mechanism/cause, not hard at all to "prove" the effect... ""Plastics..don't know, have only destroyed them, or have seen no effect (not looking for any). My experience is primarily concerned with survival of the dielectric withstanding capability.
Key point.. "may be some things going on". For structural apps, where the properties cold/warm were needed, much testing was done. Unfortunately, electrical properties of metals through cold treatment has received less attention.
But, definitely hard to pinpoint the mechanism, and also hard to prove the effect (by prove, I mean measured using equipment). Alas, a flaw in our current abilities to measure.
- plastics, as in teflon and the polycarbonate mat'l use in CD; the improvement of physical characteristics of plastics by cryogenics is well known/documented...not to worry about dielectric...
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