41–50 of 65 posts
> We used type IIac conic synthetic diamonds (supplied by Almax Easy-Lab) with ~30 micron diameter culet flats. About 5 microns were etched off of the diamond culets using the technique of reactive ion etching, to remove defects from the surface. The diamonds were then vacuum annealed at high temperature to remove residual stress. Alumina is known to act as a diffusion barrier against hydrogen. The diamonds, with the…
> We used type IIac conic synthetic diamonds (supplied by Almax Easy-Lab) with ~30 micron diameter culet flats. About 5 microns were etched off of the diamond culets using the technique of reactive ion etching, to remove defects from the surface. The diamonds were then vacuum annealed at high temperature to remove residual stress. Alumina is known to act as a diffusion barrier against hydrogen. The diamonds, with the…
Still incredible! We as people tend to underestimate just how "magical" our mobile phones are.
Someone with a chem/physics background, could you please explain why metallic hydrogen is only theorized to be a superconductor? Is such a property not predictable?
So we need to approximate our solutions to be able to get a good idea of what properties a material will have. Our approximations are pretty good and we have a decent idea of when some things superconductor. But our theories of superconduction aren't yet perfect, and sometimes the approximations can fail//generate behavior unexpected by our theories.
Super cool stuff! There are some greatly quotable sentences in the paper: > Moreover, SMH (solid metal hydrogen) is predicted to be metastable so that it may exist at room temperature when the pressure is released. If so, and superconducting, it could have an important impact on mankind’s energy problems and would revolutionize rocketry as a powerful rocket propellant. > The principal limitation for achieving the req…
Standard atmospheric pressure ~= 100Pa
So they increased the pressure in that chamber by 4.95billion times.
And then they hypothesise that the hydrogen metal could be stable at room temperature.
Oh. My. Days.
495GPa... doesn't seem so bad... Standard atmospheric pressure ~= 100Pa So they increased the pressure in that chamber by 4.95billion times. And then they hypothesise that the hydrogen metal could be stable at room temperature. Oh. My. Days.
Earlier quoted context omitted.
Metallic Hydrogen can also be a liquid and even a gas, the metallic part indicates it's an electric conductor, not a solid. The "idea" behind metallic hydrogen is that since hydrogen is above the alkali metals in the periodic tables there should be a phase where it behaves like a metal, the state of the phase is not defined as a solid/gas/liquid in fact in all honesty it would exist as all 3 and more. The first produ…
But your parent and grandparent comments are talking about the fact that the authors theorize it may remain metallic once the pressure is released.
495GPa... doesn't seem so bad... Standard atmospheric pressure ~= 100Pa So they increased the pressure in that chamber by 4.95billion times. And then they hypothesise that the hydrogen metal could be stable at room temperature. Oh. My. Days.
Just for reference the pressure at the center of the Earth is estimated to be around 360 GPa, while they are using 495 GPa and DACs able to reach over 700 GPa. https://en.wikipedia.org/wiki/Diamond_anvil_cell
Super cool stuff! There are some greatly quotable sentences in the paper: > Moreover, SMH (solid metal hydrogen) is predicted to be metastable so that it may exist at room temperature when the pressure is released. If so, and superconducting, it could have an important impact on mankind’s energy problems and would revolutionize rocketry as a powerful rocket propellant. > The principal limitation for achieving the req…
hell with rocket fuel, if the stuff isn't horribly expensive to produce it could be a good portable source period