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Room Temperature Superconductor?

07/28/2023 9:34 AM

Maybe it's happened, a superconductor you can hold in your hand. Researchers in Korea report evidence of superconductivity in modified Lead Apatite (Pb10(PO4)6O) at room temperature and ambient pressure.

https://arxiv.org/ftp/arxiv/papers/2307/2307.12008.pdf

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#1

Re: Room Temperature Superconductor?

07/28/2023 2:59 PM

Wow.. that would be cool if it pans out to be practical...but I guess we have to wait a while for replication and peer review....still a bold claim that even if it doesn't pan out might lead to something...The quest for funding seems to lead to premature release of information that turns out to be anomalous at best sometimes...still it sounds cool, chemically induced superconducting quantum wells...haha

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#2

Re: Room Temperature Superconductor?

07/30/2023 1:16 PM

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#3

Re: Room Temperature Superconductor?

07/30/2023 8:49 PM

This is huge. The levitating piece of lead apatite levitating over the magnet seems to nail it.

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#4
In reply to #3

Re: Room Temperature Superconductor?

07/30/2023 10:42 PM

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#7
In reply to #4

Re: Room Temperature Superconductor?

07/31/2023 10:10 AM

This is a great achievement if proved to be true. SE would you like to explain the picture you have posted? Is IT proved to be true?

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#8
In reply to #7

Re: Room Temperature Superconductor?

07/31/2023 12:58 PM

You can click on the pic, and see for yourself....the proof is in the pudding...

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#9
In reply to #7

Re: Room Temperature Superconductor?

07/31/2023 1:44 PM

An LED bulb using electromagnetic induction as I suspected. Not an incandescent bulb such as in the fake picture of Nicola Tesla lighting up an incandescent bulb in a spark of a Tesla coil with no measureable current.

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#10
In reply to #9

Re: Room Temperature Superconductor?

07/31/2023 5:56 PM

Shirley you are aware that incandescent bulbs have been banned...

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#16
In reply to #10

Re: Room Temperature Superconductor?

08/06/2023 9:28 AM

Ah good, the planet is safe now...

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#5

Re: Room Temperature Superconductor?

07/31/2023 8:06 AM

The thing is that <...hold in...hand...> will raise the temperature of the <...superconductor...> towards that of the <...hand...>.

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#6
In reply to #5

Re: Room Temperature Superconductor?

07/31/2023 8:24 AM

They are claiming a critical temperature of about 400 degrees K, higher than the boiling point of water. Time will tell.

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#11

Re: Room Temperature Superconductor?

07/31/2023 7:50 PM

I think it's an UFO report.

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#24
In reply to #11

Re: Room Temperature Superconductor?

08/08/2023 5:08 AM
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#12

Re: Room Temperature Superconductor?

08/01/2023 12:48 PM

. . . but it will violate all the RoHS laws so we wouldn't be able to use it even if it did work as intended.

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#13

Re: Room Temperature Superconductor?

08/01/2023 2:06 PM

Oops...Reported Failure To Reproduce Superconductivity At Room Temperature In LK-99....

https://www.science20.com/hontas_farmer/reported_failure_to_reproduce_superconductivity_at_room_temperature_in_lk99-256723

strike one....

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#14
In reply to #13

Re: Room Temperature Superconductor?

08/02/2023 3:43 PM

strike one....

Hopefully there will be a home run soon. I have no idea how finicky making this stuff is. It would be really cool if it pans out.

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#15
In reply to #14

Re: Room Temperature Superconductor?

08/05/2023 6:25 PM

....."a team from Beihang University in Beijing. They’ve published a paper in which they characterize their sample of LK-99, and sadly according to them it’s no superconductor.

Instead it’s a diamagnetic semiconductor, something that in itself probably bears some explanation. We’re guessing most readers will be familiar with semiconductors, but diamagnetic substances possess the property of having an external magnetic field induce an internal magnetic field in the opposite direction. This means that they will levitate in a magnetic field, but not due to the Meissner effect, the property of superconductors which causes magnetic field to flow round their outside. The Beijing team have shown by measuring the resistance of the sample that it’s not a superconductor."....

https://hackaday.com/2023/08/05/lk-99-diamagnetc-semiconductor-not-superconductor/

...strike two ....

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#17
In reply to #15

Re: Room Temperature Superconductor?

08/06/2023 10:05 AM

Oh well, I figured it was a lottery ticket, a minute chance at a big payoff.

My understanding is that all materials are diamagnetic, i.e., weakly repelled by a magnetic field, but some substances (with unpaired electrons) are paramagnetic (weakly attracted) or ferromagnetic (strongly attracted), which is much stronger and overpowers the diamagnetism.

"Diamagnetism is a property of all materials, and always makes a weak contribution to the material's response to a magnetic field. However, other forms of magnetism (such as ferromagnetism or paramagnetism) are so much stronger such that, when different forms of magnetism are present in a material, the diamagnetic contribution is usually negligible."

https://en.wikipedia.org/wiki/Diamagnetism#:~:text=Diamagnetic%20materials%20are%20those%20that,as%20mercury%2C%20gold%20and%20bismuth.

Water is diamagnetic and a strong magnet immersed in shallow water will produce a shallow dent in the water surface. This can be seen by observing the reflection of a window screen, as we've discussed here before.

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#18
In reply to #17

Re: Room Temperature Superconductor?

08/06/2023 8:55 PM

I was immediately suspicious when the sample was not completely elevated... if the sample was displaying the Meissner effect, it would be totally elevated I think....of course it could be partially displaying type II superconductor properties and may require lower temperature to succeed...

https://en.wikipedia.org/wiki/Type-II_superconductor

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#19
In reply to #18

Re: Room Temperature Superconductor?

08/06/2023 10:03 PM
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#20
In reply to #18

Re: Room Temperature Superconductor?

08/07/2023 8:29 AM

Then again, pyrolytic graphite isn't a superconductor, but here it is levitated...

pyrolytic graphite levitation - Search (bing.com)

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#21
In reply to #20

Re: Room Temperature Superconductor?

08/07/2023 5:27 PM

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#22
In reply to #21

Re: Room Temperature Superconductor?

08/07/2023 7:32 PM

My thought was that no one understands superconductors and no one understands women. So if the former can levitate, why not the latter?

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#23
In reply to #22

Re: Room Temperature Superconductor?

08/07/2023 9:28 PM

..."The Biefeld–Brown effect is an electrical phenomenon that produces an ionic wind that transfers its momentum to surrounding neutral particles. It describes a force observed on an asymmetric capacitor when high voltage is applied to the capacitor's electrodes.[1] Once suitably charged up to high DC potentials, a thrust at the negative terminal, pushing it away from the positive terminal, is generated.[2] The effect was named by inventor Thomas Townsend Brown who claimed that he did a series of experiments with professor of astronomy Paul Alfred Biefeld, a former teacher of Brown whom Brown claimed was his mentor and co-experimenter at Denison University in Ohio.[3]

The use of an asymmetric capacitor, with the negative electrode being larger than the positive electrode, allowed for more thrust to be produced in the direction from the low-flux to the high-flux region compared to a conventional capacitor.[2] These asymmetric capacitors became known as Asymmetrical Capacitor Thrusters (ACT).[4] The Biefeld–Brown effect can be observed in ionocrafts and lifters, which utilize the effect to produce thrust in the air without requiring any combustion or moving parts.[1] "...

I wonder if a motor could be designed using these principles....

https://en.wikipedia.org/wiki/Biefeld%E2%80%93Brown_effect

This is pretty cool...

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#25
In reply to #23

Re: Room Temperature Superconductor?

08/08/2023 6:06 PM

I'm pretty sure the Biefeld-Brown effect doesn't work in a vacuum, so it's just one of the ways to impart momentum to the surrounding atmosphere to generate a force (lift). There are other ways to do this that may be more efficient.

I wonder if a motor could be designed using these principles....

Electrostatic motors have been around since Benjamin Franklin's day. The high voltages needed are kind of a nuisance if you have discharge where you don't want it. Magnetic motors don't have this problem as there don't seem to be any loose magnetic monopoles around.

https://en.wikipedia.org/wiki/Electrostatic_motor

I suppose ion-engines for spacecraft could be considered a electrostatic motor.

https://en.wikipedia.org/wiki/Ion_thruster

The spinning magnet arrays in the video generate eddy currents in the copper which generate the same magnetic field as "mirror" image magnets. I've seen it suggested as a device to move heavy loads around in a warehouse. That would require a copper floor and power for the motors, and you would have to deal with the heat. A simpler platform with caster wheels would be more practical, IMHO.

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#26
In reply to #25

Re: Room Temperature Superconductor?

08/08/2023 9:01 PM

A simpler platform with caster wheels would be more practical, IMHO.

Another method for moving heavy loads requires only a flat floor, an air supply, and a "pallet" with a continuous bottom with a bunch of air holes in it. It will move very easily, but I don't offhand know the CFM or air pressures needed.

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#27

Re: Room Temperature Superconductor?

08/09/2023 2:54 AM
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