Art Vandelay
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The First Room-Temperature Ambient-Pressure Superconductor
Anyone made this yet?
| Quote: | | For the first time in the world, we succeeded in synthesizing the room-temperature superconductor (Tc≥400 K, 127∘C) working at ambient pressure
with a modified lead-apatite (LK-99) structure. The superconductivity of LK-99 is proved with the Critical temperature (Tc), Zero-resistivity,
Critical current (Ic), Critical magnetic field (Hc), and the Meissner effect. The superconductivity of LK-99 originates from minute structural
distortion by a slight volume shrinkage (0.48 %), not by external factors such as temperature and pressure. The shrinkage is caused by Cu2+
substitution of Pb2+(2) ions in the insulating network of Pb(2)-phosphate and it generates the stress. It concurrently transfers to Pb(1) of the
cylindrical column resulting in distortion of the cylindrical column interface, which creates superconducting quantum wells (SQWs) in the interface.
The heat capacity results indicated that the new model is suitable for explaining the superconductivity of LK-99. The unique structure of LK-99 that
allows the minute distorted structure to be maintained in the interfaces is the most important factor that LK-99 maintains and exhibits
superconductivity at room temperatures and ambient pressure. |
https://doi.org/10.48550/arXiv.2307.12008
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Rainwater
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Waiting peer review. Their have been so many fake superconductors, not sure why
The synthesis process isnt that bad.
800c is moderately difficult on medium/large scale, easy on small scale.
But the 0.00001 torr. Thats not easy.
Have to break out a diffusion pump. That may not be enough.
Also phosphorus is illegal to own/handle/make/buy in my area.
So sourcing the CuP would be another issue.
Everything else is easy to source.
"You can't do that" - challenge accepted
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unionised
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Wiki tells me that ...
Copper phosphide can be produced in a reverberatory furnace or in a crucible, e.g. by a reaction of red phosphorus with a copper-rich material. It can
also be prepared photochemically, by irradiating cupric hypophosphite with ultraviolet radiation.[5] It can also be produced by reducing copper(II)
phosphate with aluminum metal[6]
The second of their references is interesting.
http://www.sciencemadness.org/smwiki/index.php/Phosphorus#:~:text=The%20copper%20phosphide%20can%20be%20obtained%20by%20reducing%20copper(II)%20phosph
ate%20with%20a%20metal,%20(aluminium%20e.g.).
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leau
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Superconducting Meoteorites
Superconductivity found in meteorites
James Wampler, Mark Thiemens, Shaobo Chen, Yimei Zhu and Ivan K. Schullera
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7148572/
Meteorites can contain a wide range of material phases due to the extreme environments found in space and are ideal candidates to search for natural
superconductivity. However, meteorites are chemically inhomogeneous, and superconducting phases in them could potentially be minute, rendering
detection of these phases difficult. To alleviate this difficulty, we have studied meteorite samples with the ultrasensitive magnetic field modulated
microwave spectroscopy (MFMMS) technique [J. G. Ramírez, A. C. Basaran, J. de la Venta, J. Pereiro, I. K. Schuller, Rep. Prog. Phys. 77, 093902
(2014)]. Here, we report the identification of superconducting phases in two meteorites, Mundrabilla, a group IAB iron meteorite [R. Wilson, A.
Cooney, Nature 213, 274–275 (1967)] and GRA 95205, a ureilite [J. N. Grossman, Meteorit.Planet. Sci. 33, A221–A239 (1998)]. MFMMS measurements
detected superconducting transitions in samples from each, above 5 K. By subdividing and remeasuring individual samples, grains containing the largest
superconducting fraction were isolated. The superconducting grains were then characterized with a series of complementary techniques, including
vibrating-sample magnetometry (VSM), energy-dispersion
is attached 
Attachment: 1509.04452.pdf (3.5MB)
This file has been downloaded 171 times
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Kloberth
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I don't think that such low pressures are required for these reaktions actually I think they had just this pump on hand and why use a worse one.
If the paper is legit I would be eager to try the synthesis of this material!
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Rainwater
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Me to, a super conducting magnet would really help my nmr build
"You can't do that" - challenge accepted
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leau
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Physical Properties of High-Temperature Superconductors
Ranier Wesche
The Iron Pnictide Superconductors An Introduction and Overview
Ferdinando Mancin &i Roberta Citro
can be downloaded from:
https://www.4shared.com/zip/FIRdB0O_ku/SuperConductors.html]SuperConductors.zip
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Art Vandelay
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This article and the shitstorm it has unleashed on the internet is pretty funny actually, waiting for peer review seems like a smart idea, because no
doubt it's being replicated right now somewhere already and the unveilment yesterday at the International Symposium on Metalic Multilayers in Korea
University doesn't bode well in all honesty. This Kwon guy seems to have released it out of spite for being fired from the university a couple of
months ago, according to the rumours anyways, there's enough material to make a movie out of it.
Best comment I read somewhere is that "these guys are just chemists, they don't understand the science".
Here's some more info on the subject:
Superconductor Pb10-xCux(PO4)6O showing levitation at room temperature and atmospheric pressure and mechanism
https://arxiv.org/ftp/arxiv/papers/2307/2307.12037.pdf
Consideration for the development of room-temperature ambient-pressure superconductor (LK-99)
https://www.kci.go.kr/kciportal/landing/article.kci?arti_id=...
See attached pdf for the google translated version.
Room temperature and normal pressure superconducting ceramic compound, and method for manufacturing same
https://patents.google.com/patent/WO2023027536A1/en
other noteworthy links:
https://jorge.physics.ucsd.edu/jh.html
https://sciencecast.org/casts/suc384jly50n
https://youtu.be/EtVjGWpbE7k
https://www.zhihu.com/question/613850973/answer/3136029641
Attachment: Journal of the Korean Crystal Growth and Crystal Technology LK-99.pdf (789kB)
This file has been downloaded 144 times
[Edited on 29-7-2023 by Art Vandelay]
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Rainwater
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The sample was thermally deposited on a copper plate.
Is the description of the youtube video.
Copper will do that in a magnetic field with easy.
Very poor choice to test the magnetic properties of their material.
If the ohms values per cm2 are accurate, then this stuff will replace copper for wire
"You can't do that" - challenge accepted
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wg48temp9
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Quote: Originally posted by Rainwater  | The sample was thermally deposited on a copper plate.
Is the description of the youtube video.
Copper will do that in a magnetic field with easy.
Very poor choice to test the magnetic properties of their material.
If the ohms values per cm2 are accurate, then this stuff will replace copper for wire |
That youtube video appears to have been created by a company that is not related to the people who discovered the room temperature super conductor.
It probably just uses a copper disk.
I think its clickbait.
I am wg48 but not on my usual pc hence the temp handle.
Thank goodness for Fleming and the fungi.
Old codger' lives matters, wear a mask and help save them.
Be aware of demagoguery, keep your frontal lobes fully engaged.
I don't know who invented mRNA vaccines but they should get a fancy medal and I hope they made a shed load of money from it.
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Tsjerk
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https://arxiv.org/abs/2307.16892
https://www.nextbigfuture.com/2023/07/lawrence-berkeley-lab-...
[Edited on 1-8-2023 by Tsjerk]
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pantone159
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https://www.science.org/content/blog-post/room-temperature-s...
A blog post by Derek Lowe with some very guarded optimism about this. Hopefully we will find out for sure pretty soon.
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Tsjerk
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https://www.google.com/amp/s/jabde.com/2023/08/02/synthesis-...
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Art Vandelay
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It's going pretty fast now.
Superconductor Pb10−xCux(PO4)6O showing levitation at room temperature and atmospheric pressure and mechanism
https://arxiv.org/abs/2307.12037
First-principles study on the electronic structure of Pb10−xCux(PO4)6O (x=0, 1)
https://arxiv.org/abs/2307.16040
Pb-apatite framework as a generator of novel flat-band CuO based physics, including possible room temperature superconductivity
https://arxiv.org/abs/2308.00698
Electronic structure of the putative room-temperature superconductor Pb9Cu(PO4)6O
https://arxiv.org/abs/2308.00676
Theoretical insight on the LK-99 material
https://arxiv.org/abs/2308.01135
Observation of zero resistance above 100∘ K in Pb10−xCux(PO4)6O
https://arxiv.org/abs/2308.01192
Broad Band Mott Localization is all you need for Hot Superconductivity: Atom Mott Insulator Theory for Cu-Pb Apatite
G. Baskaran
https://arxiv.org/abs/2308.01307
Minimal model for the flat bands in copper-substituted lead phosphate apatite
https://arxiv.org/abs/2308.01315
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Art Vandelay
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Sorry, first study in the post above is a repost from earlier, it was updated though. There's probably so much more I could post, but I didn't want
anyone here to miss this one, a bit of comical relief maybe.
https://twitter.com/iris_IGB/status/1686071973011472406
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mayko
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What's the big deal? I thought room-temperature superconductors were a solved problem:
https://arxiv.org/pdf/2003.14321.pdf 
al-khemie is not a terrorist organization
"Chemicals, chemicals... I need chemicals!" - George Hayduke
"Wubbalubba dub-dub!" - Rick Sanchez
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SnailsAttack
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So it sounds like it's primarily lead phosphate with a bit of copper and a bit of oxide. Unless I'm
misunderstanding it I think the formula could be expressed as a ~3:1 adduct of lead phosphate and copper oxide:
3Pb₃(PO₄)₂ · CuO
What's the catch? I don't suppose you could just grind those materials together with a mortar and pestle and have a working superconductor. Does it
gotta be a crystal or something?
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clearly_not_atara
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The proposed chemical equations for this substance are all obviously wrong. It is not acceptable to show metallic copper or lead as a product;
electrons will not be transferred from sulfur or phosphorus to these metals. Equations must be balanced.
It may be helpful to determine what conditions stabilize the necessary crystal structure if we start from an understanding of what compounds are
actually present in the samples.
Here is one equation which is actually possible:
49 Pb2(SO4)O + 48 Cu3P >> 8 Pb9Cu(PO4)6O + 49 Cu2S + 26 PbO + 19 Cu2O
Notably, this comes very close to the "equimolar" quantities originally reported (off by 2.2%).
It appears that Cu2S or possibly PbO may serve as the critical support for "templating" the growth of sc-Pb9Cu(PO4)6O. Samples of "LK-99" produced by
other methods are unsatisfactory even when the "correct" stoichiometry is obtained. It would be interesting to see if the material made by other
methods can become interesting when it is mixed with Cu2S and melted. Substituting Cu2S with other similar materials like Ag2S may also be fruitful.
EDIT: Considering the heats of formation I find that the exchange between Cu2S + PbO <> Cu2O + PbS favors the latter by about 30 kJ/mol.
Therefore it is more likely to see:
49 Pb2(SO4)O + 48 Cu3P >> 8 Pb9Cu(PO4)6O + 23 Cu2S + 26 PbS + 45 Cu2O
[Edited on 4-8-2023 by clearly_not_atara]
[Edited on 04-20-1969 by clearly_not_atara]
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Art Vandelay
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I'd go with zinc, nickel and gold instead. From "First-principles study on the electronic structure of Pb10−xCux(PO4)6O (x=0, 1)":
| Quote: | | We find that among the considered doping elements (Ni, Cu, Zn, Ag, and Au), both Ni and Zn doping result in the gap opening, whereas Au exhibits
doping effects more similar to Cu than Ag. |
New papers:
Successful growth and room temperature ambient-pressure magnetic levitation of LK-99
https://arxiv.org/abs/2308.01516
Some remarks on possible superconductivity of composition Pb9CuP6O25
https://arxiv.org/abs/2308.01723
Some other 6 day old papers that haven't been posted yet:
Semiconducting transport in Pb10−xCux(PO4)6O sintered from Pb2SO5 and Cu3P
https://arxiv.org/abs/2307.16802
Synthesis of possible room temperature superconductor LK-99:Pb9Cu(PO4)6O
https://arxiv.org/abs/2307.16402
Videos that go with one of the papers above:
Observing the magnetic reaction of a material under a magnet using a microscope
https://targum.video/v/2023/8/1/e2ad3b8e86961ccfdcf411d2d4d1...
Latest research findings on LK99 from the Physics Department of Southeast University
https://targum.video/v/2023/8/2/388e770217a654ba9175b391eedd...
Twitter links with some videos:
https://twitter.com/andrewmccalip/status/1687405505604734978
https://twitter.com/lere0_0/status/1686363900651151360
An actual livestream of a team in Taiwan cooking:
https://youtu.be/zVkVBvo8_GM
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clearly_not_atara
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You are confusing doping with templating or confining.
Anyway, it is important to also consider that I had to revise the calculations. I initially assumed that copper would bind all the sulfur, since
copper sulfide was the only byproduct initially reported. But the formation of lead sulfide is much more favorable.
This means that the byproducts are predominantly cubic PbS and cubic Cu2O rather than monoclinic Cu2S. The expectation for templating crystal growth
should change accordingly.
It is obvious that the given chemical structure Pb9Cu(PO4)6O is not the end of the story — otherwise the videotaped diamagnetism,
conductivity-temperature dependence, etc would be present in ordinary samples made by the "obvious" reaction of lead phosphate and cupric oxide. But
these properties only appear when using the convoluted route, suggesting that the byproducts matter.
[Edited on 4-8-2023 by clearly_not_atara]
[Edited on 04-20-1969 by clearly_not_atara]
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Texium
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| Quote: Originally posted by SnailsAttack | | What's the catch? I don't suppose you could just grind those materials together with a mortar and pestle and have a working superconductor.
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Of course not. Read the paper, it explains the procedure in decent detail. In fact, a screenshot of the
relevant procedures is in the OP of this very thread!
[Edited on 8-5-2023 by Texium]
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Texium
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Thread Moved
30-11-2023 at 10:59 |
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