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Stellar Insights: How Sodium’s High Pressure Transformation Is Redefining Astrophysics

December 31, 2023
in Science
Stellar Insights: How Sodium’s High Pressure Transformation Is Redefining Astrophysics
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Metal Material Science Art Concept

Researchers have discovered that under extreme pressure, sodium’s electrons remain bonded to atoms, causing it to become a transparent insulator. This finding challenges previous theories and provides insights into the atomic behavior of matter in celestial bodies. Credit: SciTechDaily.com

Scientists reveal how the element’s electrons chemically bond when under pressures like those found below Earth’s crust.

Travel deep enough below the Earth’s surface or inside the center of the Sun, and matter changes on an atomic level.

The mounting pressure within stars and planets can cause metals to become nonconducting insulators. Sodium has been shown to transform from a shiny, gray-colored metal into a transparent, glass-like insulator when squeezed hard enough.

“Predicting how other elements and chemical compounds behave at very high pressures will potentially give insight into bigger-picture questions.” — Eva Zurek, professor of chemistry, University at Buffalo College of Arts and Sciences

New Insights Into High-Pressure Phenomena

Now, a University at Buffalo-led study has revealed the chemical bonding behind this particular high-pressure phenomenon.

While it’s been theorized that high pressure essentially squeezes sodium’s electrons out into the spaces between atoms, researchers’ quantum chemical calculations show that these electrons still very much belong to the surrounding atoms and are chemically bonded to each other.

Sodium Metal

A University at Buffalo-led study analyzes the chemical binding behind sodium’s transformation from shiny metal to transparent insulator under high pressure. Credit: Dnn87 (CC BY 3.0)

Implications for Understanding Celestial Bodies

“We’re answering a very simple question of why sodium becomes an insulator, but predicting how other elements and chemical compounds behave at very high pressures will potentially give insight into bigger-picture questions,” says Eva Zurek, PhD, professor of chemistry in the UB College of Arts and Sciences and co-author of the study, which was published in Angewandte Chemie, a journal of the German Chemical Society.

“What’s the interior of a star like? How are planets’ magnetic fields generated, if indeed any exist? And how do stars and planets evolve? This type of research moves us closer to answering these questions,” Zurek continued.

Challenging Established Theories

The study confirms and builds upon the theoretical predictions of the late renowned physicist Neil Ashcroft, whose memory the study is dedicated to.

It was once thought that materials always become metallic under high pressure — like the metallic hydrogen theorized to make up Jupiter’s core — but Ashcroft and Jeffrey Neaton’s seminal paper two decades ago found some materials, like sodium, can actually become insulators or semiconductors when squeezed. They theorized that sodium’s core electrons, thought to be inert, would interact with each other and the outer valence electrons when under extreme pressure.

“Our work now goes beyond the physics picture painted by Ashcroft and Neaton, connecting it with chemical concepts of bonding,” says the UB-led study’s lead author, Stefano Racioppi, PhD, a postdoctoral researcher in the UB Department of Chemistry.

Electron Behavior in High-Pressure Environments

Pressures found below Earth’s crust can be difficult to replicate in a lab, so using supercomputers in UB’s Center for Computational Research, the team ran calculations on how electrons behave in sodium atoms when under high pressure.

The electrons become trapped within the interspatial regions between atoms, known as an electride state. This causes sodium’s physical transformation from shiny metal to transparent insulator, as free-flowing electrons absorb and retransmit light but trapped electrons simply allow the light to pass through.

Chemical Bonding Explains Electride State Emergence

However, researchers’ calculations showed for the first time that the emergence of the electride state can be explained through chemical bonding.

The high pressure causes electrons to occupy new orbitals within their respective atoms. These orbitals then overlap with each other to form chemical bonds, causing localized charge concentrations in the interstitial regions.

While previous studies offered an intuitive theory that high pressure squeezed electrons out of atoms, the new calculations found that the electrons are still part of surrounding atoms.

“We realized that these are not just isolated electrons that decided to leave the atoms. Instead, the electrons are shared between the atoms in a chemical bond,” Racioppi says. “They’re quite special.”

“Obviously it is difficult to conduct experiments that replicate, say, the conditions within the deep atmospheric layers of Jupiter,” Zurek says, “but we can use calculations, and in some cases, high-tech lasers, to simulate these kinds of conditions.”

Reference: “On the Electride Nature of Na-hP4” by Stefano Racioppi, Christian V. Storm, Malcolm I. McMahon and Eva Zurek, 05 October 2023, Angewandte Chemie International Edition.
DOI: 10.1002/anie.202310802

Other contributors include Malcolm McMahon and Christian Storm from the University of Edinburgh’s School of Physics and Astronomy and Center for Science at Extreme Conditions.

The work was supported by the Center for Matter at Atomic Pressure, a National Science Foundation center led by the University of Rochester that studies how pressure inside stars and planets can rearrange materials’ atomic structure.

>>> Read full article>>>
Copyright for syndicated content belongs to the linked Source : SciTechDaily – https://scitechdaily.com/stellar-insights-how-sodiums-high-pressure-transformation-is-redefining-astrophysics/

Tags: InsightsscienceStellar
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