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Superconductivity experiment video clip
Posted on Tuesday, January 24, 2006 @ 23:39:24 GMT by vlad

Science Anonymous writes: Nice demo. The small cylinder is (possible) made of silicon. Can not identify the black block (possible made of carbon). If the cooling agent is liquid nitrogen (LN2), the temperature of the block will be at around -320.5 F degrees. As far as I know, silicon will acquire magnetic properties at superconductivity temperatures (around 2.5 Kelvin degrees). If, in this experiment, the cylinder is made of silicon, then the cooling agent could be liquid helium.

What do you think about this? Enjoy, watching it!

This is a 6.15 mpeg file: http://www.zpenergy.com/downloads/superconduct_exp.mpeg

(Nice experiment on superconductivity of crystalline networks in extreme temperature conditions)

Does anybody know where is this clip coming from (source)?



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"Superconductivity experiment video clip" | Login/Create an Account | 4 comments | Search Discussion
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Re: Superconductivity experiment video clip (Score: 1)
by guest on Wednesday, January 25, 2006 @ 07:07:27 GMT
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wow,wild guesswork.

the smalll cylinder is not made of silicon,since its not cooled.it is the magnet (cos magnets float on SC's - vice versa by the meissner effect) possibly coated NdFeB.

the black block is most likely an high temperature (type2) ceramic superconductor,most likely YBaCuO or BiSrCaCu0,hence the coolant is liquid nitrogen.

have a nice day
the visitor

Re: Superconductivity experiment video clip (Score: 1)
by ElectroDynaCat on Wednesday, January 25, 2006 @ 17:11:26 GMT
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As silicon reaches absolute zero, it becomes a perfect insulator, not a superconductor.

Re: Superconductivity experiment video clip (Score: 1)
by guest on Thursday, January 26, 2006 @ 05:12:52 GMT
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Yes, that's a black YBCO block, almost certainly a single crystal cut or cast in a rectangular block.

The shiny disc is an ordinary fridge magnet (looks as if it's chrome plated though).

The video illustrates several different important aspects of superconductivity. The way the magnet can be used to pick up the YBCO, and the way the magnet is stable in leveitation (rather than just sliding away) require some care in explanation. The ususal induced mirror" idea won't work. Note also that as the block warms up from 77K the magnet settles onto it as the s/c disappears.

Re: Superconductivity experiment video clip (Score: 1)
by guest on Thursday, January 26, 2006 @ 16:32:34 GMT
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The cooling agent can't be helium because that would not be liquid at room temperature (evaporates too fast). It is most certainly liquid nitrogen. The black cuboid is probably a high-Tc superconductor like YBa2Cu3O7-delta (short YBCO) and the cylinder simply a magnet.


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