room temperature superconductor? - Page 1
Forum section: electronics / projects

author: coppercone2
author_rank: Super Contributor
timestamp: March 10, 2023, 04:18:57 am
content: https://science.slashdot.org/story/23/03/09/0152213/revolutionary-blue-crystal-sparks-hope-of-room-temperature-superconductivityI wish I did not give up on my DAC design...

author: moffy
author_rank: Super Contributor
timestamp: March 10, 2023, 08:09:34 am
content: I remember cold fusion.

author: coppercone2
author_rank: Super Contributor
timestamp: March 10, 2023, 08:24:08 am
content: this sounds like it might be true, their not exactly promising the moon here, it would be hard to use the material in the current state

author: moffy
author_rank: Super Contributor
timestamp: March 10, 2023, 09:01:14 am
content: Wait and see until an independent lab confirms the results, that was the problem of the cold fusion debacle, results that no one else could replicate.

author: Kleinstein
author_rank: Super Contributor
timestamp: March 10, 2023, 12:01:49 pm
content: I am afraid the high pressure is way more of a hurdle as a low low temperature. The lowed the pressure a little, but still in a range only available in special high pressure cells of tiny dimensions.Compared to this the - 200°C range temperature needed for high temperature superconductors are easy.

author: coppice
author_rank: Super Contributor
timestamp: March 10, 2023, 12:08:54 pm
content: If you think the pressure on the superconductor is high, you should see the pressure on academics to publish optimistically.

author: S57UUU
author_rank: Regular Contributor
timestamp: March 10, 2023, 04:53:11 pm
content: "Tc of 294 K at 10 kbar, that is, superconductivity at room temperature and near-ambient pressures"Just 10X more than at the bottom of the deepest ocean, near ambient, sure.https://www.nature.com/articles/s41586-023-05742-0

author: shapirus
author_rank: Super Contributor
timestamp: March 10, 2023, 04:58:13 pm
content: Room temperature superconductors, just like controllable fusion with positive outcome, is only 20 years ahead.There is however one little problem: it was 20 years ahead yesterday, it is 20 years ahead today, and it will be the same 20 years ahead tomorrow.

author: mawyatt
author_rank: Super Contributor
timestamp: March 10, 2023, 05:17:29 pm
content: Maybe a little too early to completely discredit this, remember back in 1986 when a pair of IBM researchers discovered a ceramic that held superconductivity at ~30K. Here's a snip."One year later, in 1986, Müller and Bednorz created a brittle ceramic compound—extremely controversial as ceramics are generally considered insulators—that was superconductive at the highest temperature ever recorded: 30 Kelvin (–243.15 degrees Celsius, –405.67 degrees Fahrenheit). This was the first time ceramics were even remotely considered as viable candidates for use as superconductors. Bednorz recalled, “Alex and I were really excited, as repeated measurements showed perfect reproducibility and an error could be excluded. Compositions as well as the thermal treatment were varied and within two weeks we were able to shift the onset of the resistivity drop to 35K.”Soon after the temperature was improved to above 77K, and we must recall that before this all superconductivity were around a few Kelvin (highest 16)!!In 1987 Muller and Bednorz were awarded the Nobel Prize!!https://www.ibm.com/ibm/history/ibm100/us/en/icons/hightempsuperconductors/Best,

author: shapirus
author_rank: Super Contributor
timestamp: March 10, 2023, 05:25:34 pm
content: Quote from: mawyatt on March 10, 2023, 05:17:29 pmActually yes, I was a little overly skeptical. High-temperature (relatively) superconductivity is a thing, and progress has been huge in this field.Hopefully room-temperature (and room pressure!) superconductivity is not too far away.

author: Kleinstein
author_rank: Super Contributor
timestamp: March 10, 2023, 06:17:39 pm
content: AFAIK the search for ever high TC for the high temperature superconductors is not longer giving significant improvements. The upper limit is still below -100°C and from the theoretical side there is doubt that is would work much higher in the cuprates.Still the main point for usability is getting a useful material to work a > 77 K (liquid nitrogen). There are not just wires for magents but also some squids to work at 77 K.The squids at 77 K still have higher noise than the really low temperature ones - so not all is good with just reaching the superconductivity. The very low temperature comes with other advantages too.There is some hope to get some of the pressure effect in thin films on a substrate, though usually not all the way to the GPa range unless one has super hard layers like diamond of CBN.

author: ejeffrey
author_rank: Super Contributor
timestamp: March 10, 2023, 07:36:22 pm
content: Quote from: Kleinstein on March 10, 2023, 12:01:49 pm"lowered the pressure a little" -- the recently retracted paper that nobody could reproduce required pressure of almost 200 GPa. This current publication works at 1 GPa. Its far to high for practical applications, but it's a dramatic reduction in the required pressure. This should make it much easier for other researchers to reproduce (or leave less excuses if it can't be reproduced). It also makes it a lot easier to do analytical measurements on the samples.It's not time to start rolling out room temperature superconductors to your local power grid, but it's a pretty big deal if it holds up.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: March 11, 2023, 03:11:34 am
content: Quote from: shapirus on March 10, 2023, 04:58:13 pmWelllll technically you can buy controlled fusion devices with positive outcome, if the outcome you are seeking is a beam of neutrons.https://www.shinefusion.com/neutron-generators/

author: shapirus
author_rank: Super Contributor
timestamp: March 11, 2023, 11:00:46 am
content: Quote from: Alex Eisenhut on March 11, 2023, 03:11:34 amYeah I didn't use a correct term. What I meant is called fusion energy gain factor aka Q, which has to be greater than 1.

author: libralect
author_rank: Contributor
timestamp: March 11, 2023, 12:07:14 pm
content: it's an alloy of Amercanamium and Einstinium.It costs about 200 million dollars for a meter of 18 awg wire from your local nuclear isotope shop, and it only lasts 12 seconds when you put a current on it, and in that time, it is indeed a room temp semiconductor.

author: moffy
author_rank: Super Contributor
timestamp: April 05, 2023, 10:10:59 pm
content: A link to an interesting video about the supposed superconductor: