Room temperature superconductors

Electric Motors and Controllers
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billvon   100 MW

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Room temperature superconductors

Post by billvon » Jan 11 2019 12:53pm

One of the holy grails in science is the room temperature superconductor. It's important because a superconductor transmits both heat and electrical power with zero loss, which would make motors, transmission lines, heat pipes etc far more efficient and practical.

For a long time metals had to be at liquid helium temperatures to exhibit superconductivity. Then they discovered ceramics which exhibited superconductivity at -135C. Which is still really cold, but you can get to that with liquid nitrogen which is MUCH easier to create and handle than liquid helium.

Today they announced a material - a lanthanum hydride - which is a superconductor up to -23C, which is a cold day in Canada. They have even seen some signs that it may be superconducting up to 7C, which we saw last night here in San Diego. It needs to be under tremendous pressure (170GPa, about 24 million PSI) but it's a lot easier to maintain pressure than temperature.

This is the first time that a material in "normal" temperatures (i.e. temperatures people regularly see) has exhibited superconductivity, and paves the way for much more efficient power lines, motors and electrical devices. It's a long way from here to more efficient bike motors, but it's definitely getting there.

https://www.sciencenews.org/article/new ... rconductor
--bill von

kdog   10 kW

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Re: Room temperature superconductors

Post by kdog » Jan 12 2019 7:15pm

How do you maintain 24million psi except in a diamond anvil? -135deg is a breeze compared to that!

johnnyfoos   10 mW

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Re: Room temperature superconductors

Post by johnnyfoos » Jan 14 2019 8:48am

Wait,
" tremendous pressure (170GPa, about 24 million PSI)"
A couple thousand PSI is dangerous-
At any million PSI,
I don't want to be in the same state as.
That is crazy

just
sayn

Punx0r   100 GW

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Re: Room temperature superconductors

Post by Punx0r » Jan 15 2019 3:42am

Think more of one solid material held in a highly compressed state with an outer sleeve of another solid material than a waiting-to-violently-explode compressed gas.

billvon   100 MW

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Re: Room temperature superconductors

Post by billvon » Jan 15 2019 11:21am

Punx0r wrote:
Jan 15 2019 3:42am
Think more of one solid material held in a highly compressed state with an outer sleeve of another solid material than a waiting-to-violently-explode compressed gas.
Exactly. And as research continues, the required pressure will drop.
--bill von

John in CR   100 GW

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Re: Room temperature superconductors

Post by John in CR » Jan 15 2019 6:09pm

Bill,

Where did you find the info that superconductors also have great thermal conductivity coefficients? Some quick research indicates that the opposite is true for know superconductors, ie they're good thermal insulators. Whether or not it's a good thermal conductor isn't important though, since a room temp superconductor will be a game changer for our purposes with virtually no heat from copper losses in our motors, batteries, and wiring.

billvon   100 MW

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Re: Room temperature superconductors

Post by billvon » Jan 15 2019 6:54pm

John in CR wrote:
Jan 15 2019 6:09pm
Where did you find the info that superconductors also have great thermal conductivity coefficients?
An article in Nature a while back talking about thermal conductivity in ceramic high temperature superconductors. But this is a metallic hydride rather than a ceramic, so that doesn't necessarily apply. My mistake.
--bill von

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Toorbough ULL-Zeveigh   10 MW

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Re: Room temperature superconductors

Post by Toorbough ULL-Zeveigh » Mar 01 2019 7:22pm

billvon wrote:
Jan 15 2019 11:21am
Punx0r wrote:
Jan 15 2019 3:42am
Think more of one solid material held in a highly compressed state with an outer sleeve of another solid material than a waiting-to-violently-explode compressed gas.
Exactly. And as research continues, the required pressure will drop.
no, not exactly.
pressure is only required during manufacture.
after the material remains metastable.
which is the particlar flavour-flav of rtsc this research is chasing.

https://www.cbc.ca/radio/quirks/jan-19- ... -1.4981765
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