<mrdata>
i'm going to try to apply a yttrium-barium-copper-oxide superconducting layer on a substrate
<mrdata>
and then chill it to 77 kelvin and have it superconduct; but, what substrate should i use?
<mrdata>
i'm guessing its thermal expansion should match YBCO's
<mrdata>
monel has almost the right value, but it may become magnetic at 77K
<mrdata>
how bad will it be if the CTE isnt a match? i guess the coating will delaminate
<berndj>
i thought thin films are more resilient to CTE differences?
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<SpeedEvil>
Fun!
<SpeedEvil>
They are
<SpeedEvil>
The simplest solution is probably just to google what other people have done
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<Helldesk>
do they change grain the structure, if they possess one, I wonder
<Helldesk>
*change the
<Helldesk>
or do they tend to be amorphous
<Helldesk>
transformations from face-centered cubic to body-centered cubic would change the volume/size quite a bit if any material used preferred to do such a change along the way from room temperature to 77K
<SpeedEvil>
That I was wondering about but diddn't bother typing
<mrdata>
the coating is planned to be about 500 nm to 1 um thick; cracks would really spoil my day
<mrdata>
preffered YBCO crystal orientation is parallel to the surface i think, but idk if i will get that without a lot of effort
<mrdata>
greater uniformity will yield greater critical current
<mrdata>
so probably apply the coating thicker than needed and hope the crystals line up right somewhere within its bulk