Like at the Center of Planet Uranus: How Materials Behave Under Extreme Pressure

Scitech Daily ^ | DECEMBER 29, 2022 | By UNIVERSITY OF BAYREUTH

[Red Badger]

Extreme Pressure Diamond Anvil

Structures and properties of materials at extremely high pressures and temperatures are still largely “terra incognita”. Prof. Leonid Dubrovinsky and his research partners use a laser-heated two-stage diamond anvil cell they constructed for the synthesis of materials in the terapascal range (1000 gigapascals). In situ single crystal X-ray diffraction is used for the simultaneous structural characterization of the materials. Credit: Timofey Fedotenko

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New method enables materials synthesis research and study in the terapascal range for the first time.

Jules Verne could not have dreamed of this: A research team from the University of Bayreuth, together with international partners including scientists from the University of Cologne’s Department of Chemistry, has pushed the boundaries of high-pressure and high-temperature research into cosmic dimensions. They succeeded in generating and simultaneously analyzing materials under compression pressures of more than one terapascal (1,000 gigapascals) for the first time. Such extremely high pressures prevail, for example, at the center of the planet Uranus; they are more than three times higher than the pressure at the center of the Earth. In the journal Nature, the researchers present the method they have developed for the synthesis and structural analysis of novel materials.

Theoretical models predict very unusual structures and properties of materials under extreme pressure-temperature conditions. But so far, these predictions could not be verified in experiments at compression pressures of more than 200 gigapascals. On the one hand, complex technical requirements are necessary to expose material samples to such extreme pressures, and on the other hand, sophisticated methods for simultaneous structural analyses were lacking. The experiments published in Nature, therefore, open up completely new dimensions for high-pressure crystallography: materials can now be created and studied in the laboratory that exist – if at all – only under extremely high pressures in the vastness of the Universe.

“The method we have developed enables us for the first time to synthesize new material structures in the terapascal range and to analyze them in situ – that is: while the experiment is still running. In this way, we learn about previously unknown states, properties, and structures of crystals and can significantly deepen our understanding of matter in general. Valuable insights can be gained for the exploration of terrestrial planets and the synthesis of functional materials used in innovative technologies,” Professor Dr. Leonid Dubrovinsky of the Bavarian Research Institute of Experimental Geochemistry and Geophysics (BGI) at the University of Bayreuth, the lead author of the publication.

In their study, the researchers show how they have generated and visualized in situ novel rhenium compounds using the now-developed method. The compounds in question are a novel rhenium nitride (Re7N3) and a rhenium-nitrogen alloy. These materials were synthesized under extreme pressures in a two-stage diamond anvil cell heated by laser beams. Synchrotron single-crystal X-ray diffraction enabled full chemical and structural characterization.

“Rhenium-nitrogen system is full of chemical surprises. It attracted our attention several years ago, when we produced an unusual porous compound ReN10 at a pressure of one million atmospheres as well as a superhard metallic conductor ReN2 that could withstand even extremely high compression. Synthesis at one terapascal finally allowed us to get the full picture of chemical transformations, which can occur in the Re-N system at extreme conditions,” said Dr. Maxim Bykov from the Institute of Inorganic Chemistry at the University of Cologne.

“If we apply high-pressure crystallography in the terapascal range in the future, we may make further surprising discoveries in this direction. The doors are now wide open for creative materials research that generates and visualizes unexpected structures under extreme pressures,” said the study’s other lead author, Professor Dr. Natalia Dubrovinskaia from the Laboratory of Crystallography at the University of Bayreuth.

Reference:

“Materials synthesis at terapascal static pressures” by Leonid Dubrovinsky, Saiana Khandarkhaeva, Timofey Fedotenko, Dominique Laniel, Maxim Bykov, Carlotta Giacobbe, Eleanor Lawrence Bright, Pavel Sedmak, Stella Chariton, Vitali Prakapenka, Alena V. Ponomareva, Ekaterina A. Smirnova, Maxim P. Belov, Ferenc Tasnádi, Nina Shulumba, Florian Trybel, Igor A. Abrikosov and Natalia Dubrovinskaia, 11 May 2022, Nature.

DOI: 10.1038/s41586-022-04550-2

Together with the Bavarian Research Institute of Experimental Geochemistry and Geophysics (BGI) and the Laboratory of Crystallography at the University of Bayreuth, numerous other research partners were involved in the research work published in Nature: the University of Cologne, the University of Linköping, the German Electron Synchrotron DESY in Hamburg, the European Synchrotron Radiation Facility in Grenoble and the Center for Advanced Radiation Sources at the University of Chicago.

[Red Badger]

Ping!................

[dfwgator]

It’s the terror of knowing what this world’s all about.

[dsrtsage]

Here we go

[ConservativeMind]

There can be a lot of pressure, in, well, you know where…

[Craftmore]

Would have been cheaper to just buy from the dollar menu at taco bell if you wanted to experience pressure in uranus,,,

[Boogieman]

I guess the real trick is whether they can synthesize some novel materials that will actually be stable when returned to normal temperatures and pressures.

[Red Badger]

Natural Diamonds are created under high temperatures and pressures and remain stable at normal room temps.................

[Boogieman]

Yes, but those aren’t exactly novel materials with new properties to exploit.

[dfwgator]

[Red Badger]

True, but at least it points the way to things that can be tried. Carbon and silicon and other elements that cannot combine under normal circumstances.

I once read that the earths center probably has more metal in a molten state than all the entire surface mining has removed in history....................

[Red Badger]

They could have just asked Mayor Pete.........................

[BobL]

“Like at the Center of Planet Uranus: How Materials Behave Under Extreme Pressure”

At least the writer knew enough to include the word “Planet” in the headline.

[Red Badger]

😜👍🤦‍♂️................................

[ml/nj]

There is no high pressure at the center of Uranus or any planet. Materials at the center are surrounded by an essentially uniform mass field.

ML/NJ

[samkatz]

This illustrates why we should send men to explore the center of Uranus.

I believe a certain Cabinet member will be the first to volunteer.

[takebackaustin]

You are mistaken. Your symmetry argument could validly demonstrate that the local gravitational acceleration ( weight of a given mass ) decreases to zero at the center of a planet. However the pressure increases to the center of the planet.

Speaking loosely, the pressure on the volume element is independent of its own weight but rather caused by the weight (mutual attraction forces) of all the materials around it which are transmitted across it.

[Reily]

Citation please!

[Clarancebeaks]

I don’t know what the pressure in Uranus is like, and I don’t want to know. However when the pressure in my anus becomes dangerously high, I just let it rip. At my age that can be quite risky and embarrassing especially when you lose the ability to differentiate between gas pressure and solid mass.

[seowulf]

Natural Diamonds are created under high temperatures and pressures and remain stable at normal room temps

Actually, if I remember correctly, they are not stable at normal temp and pressure thermodynamically, but chemical kinetics says it will take a very, very long time for those carbon-carbon bonds to break.