South Korean Scientists Claim Ambient Temp. Superconductivity - Page 1
Forum section: electronics / general

author: HuronKing
author_rank: Frequent Contributor
timestamp: July 26, 2023, 08:14:06 pm
content: Not peer reviewed - published on arXiv:https://arxiv.org/ftp/arxiv/papers/2307/2307.12008.pdf

author: Gyro
author_rank: Super Contributor
timestamp: July 26, 2023, 08:17:36 pm
content: There's an ongoing discussion. Whether it deserves to remain in the Dodgy Technology section remains to be seen...https://www.eevblog.com/forum/dodgy-technology/room-temperature-superconductor-386518/

author: Infraviolet
author_rank: Super Contributor
timestamp: July 26, 2023, 08:19:18 pm
content: If it is a real result, very impressive and perhaps world changingly useful. Most of the recent cotnroversies about high temp superconductors have been amount materials working at room temperature, but only under incredible pressures between the points of diamond anvils, unlike those this discovery, if it can be replicated, looks ready for much quicker practical deployment.

author: HuronKing
author_rank: Frequent Contributor
timestamp: July 26, 2023, 08:20:49 pm
content: Quote from: Gyro on July 26, 2023, 08:17:36 pmThanks - I never read that subforum so I was unaware it was already being discussed. Apologies if a mod needs to lock this one up!

author: KE5FX
author_rank: Super Contributor
timestamp: July 26, 2023, 09:19:05 pm
content: Hopefully the thread in Dodgy Technology can be the one that gets closed. But I wouldn't bet on it...

author: Bud
author_rank: Super Contributor
timestamp: July 27, 2023, 02:25:50 am
content: It must be a bit hot in Korea, if 127 C is room temperature to them.

author: gnuarm
author_rank: Super Contributor
timestamp: July 27, 2023, 06:28:56 am
content: Quote from: Bud on July 27, 2023, 02:25:50 amLOL That's the max temperature. It is superconducting at temperatures below that. The impressive bit, is the lack of need for high pressures.However, there's still a lot of other requirements for it to be useful. It has to have physical properties that allow it to be formed into useful shapes and have tolerance to shock, vibration, etc.

author: HuronKing
author_rank: Frequent Contributor
timestamp: July 27, 2023, 05:22:22 pm
content: Quote from: gnuarm on July 27, 2023, 06:28:56 amYes to the needing to be useful shapes but I think tolerances for shock/vibration are less critical for some of the most immediate applications. MRI machines already have fairly low tolerances for those things and that's where ambient superconductors would be a wonderful thing to have. No more helium cooling requirements - oh how great it would be for MRIs to just be something you can do without it being a big expensive deal.

author: gnuarm
author_rank: Super Contributor
timestamp: July 27, 2023, 05:35:59 pm
content: I thought we already had superconductors at liquid nitrogen temperatures? That's much easier to come by than liquid helium. You can easily make liquid nitrogen in any facility.

author: HuronKing
author_rank: Frequent Contributor
timestamp: July 27, 2023, 08:18:25 pm
content: Quote from: gnuarm on July 27, 2023, 05:35:59 pmLiquid nitrogen can only get down to 60K. That's used for external cooling. The internal MRI magnet materials need to get down to 4K for superconductivity:https://mriquestions.com/superconductive-design.htmlThe cooling apparatus are the most expensive and difficult part of MRI machines. Eliminating the need for complex liquid helium containment would make MRI machines far cheaper and mobile.

author: gnuarm
author_rank: Super Contributor
timestamp: July 27, 2023, 08:35:36 pm
content: Quote from: HuronKing on July 27, 2023, 08:18:25 pmI'm sure that's true for various MRI machines. But superconductors exist at temperatures well above 60 °K.

author: HuronKing
author_rank: Frequent Contributor
timestamp: July 27, 2023, 09:02:22 pm
content: Quote from: gnuarm on July 27, 2023, 08:35:36 pmYes but none of those are suitable for applications where we need to use liquid helium (MRIs being the most common case) which is what I thought you were referring to (since that's the example I was pointing at).Some stuff can superconduct with liquid nitrogen but its still hardly ambient temp!

author: TimFox
author_rank: Super Contributor
timestamp: July 27, 2023, 09:32:38 pm
content: For a result as important as this, I would wait for an article in a peer-reviewed journal before applauding.

author: SiliconWizard
author_rank: Super Contributor
timestamp: July 27, 2023, 09:35:38 pm
content: Has anyone read the article in full? Not my area of expertise, but still a number of key statements in it smell like nice BS.Also waiting for specialists to review it.

author: HuronKing
author_rank: Frequent Contributor
timestamp: July 27, 2023, 10:02:11 pm
content: Quote from: SiliconWizard on July 27, 2023, 09:35:38 pmI did read it - some of the terminology and referenced theorems were unfamiliar to me but the key statement appears to be this:QuoteThis whole section seems like a wholly inadequate theoretical description of what is happening. The paper doesn't really explain why this would cause magnetic fields to be expelled from the structure of the atoms which is a necessary condition for superconductivity. It may be that some things are lost in translation but it doesn't seem like they fully understand why this happened - assuming their data is correct!I also just noticed some of their diagrams use comic-sans font.Maybe Dodgy Tech is where this belongs.

author: TimFox
author_rank: Super Contributor
timestamp: July 27, 2023, 10:06:42 pm
content: MRI superconductors need to work at high current and high magnetic field, not just superconduct at a useful temperature.

author: gnuarm
author_rank: Super Contributor
timestamp: July 28, 2023, 12:07:03 am
content: Quote from: HuronKing on July 27, 2023, 09:02:22 pmWhich is what I said, no?Quote