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At a few million atmospheric pressures, Hydrogen nears metal conductivity

Mihai AndreibyMihai Andrei
June 5, 2013
in Chemistry, Physics
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Hydrogen is the most common element in the Universe. It’s the first element in the periodic table, and it has but one proton and one electron. Understanding how it behaves at very large pressures is crucial to our understanding of matter and the nature of hydrogen-rich planets.

hydrogen

Under typical conditions, Hydrogen is a diatomic molecule (H2); but as pressure increases, these molecules start to change – these different forms are called phases, and hydrogen as three well known solid phases. But it has also been speculated that at very large pressures, it starts acting like a metal, conducting electricity. As a matter of fact, a few more bold physicists believe that it can even become a superconductor or a superfluid that never freezes–a completely new and exotic state of matter.

In this new paper, a team from Carnegie’s Geophysical Laboratory examined the structure, bonding and electronic properties of highly compressed hydrogen using a technique called infrared radiation.

The team found the new form to occur between 2.2 million atmospheres at about 25 degrees Celsius (80 Fahrenheit) to at least 3.4 million times atmospheric pressure and about -70 degrees Celsius (-100 Fahrenheit).

Their results showed that in these conditions, hydrogen acts like no other structure that we know of. It has two very different types molecules in its structure – one which interacts very weakly with its neighboring molecules (highly unusual for matter at such high pressures), and another which bonds with its neighbors, forming surprising planar sheets.

“This simple element–with only one electron and one proton–continues to surprise us with its richness and complexity when it is subjected to high pressures,” Russell Hemley, Director of the Geophysical Laboratory, said. “The results provide an important testing ground for fundamental theory.”

Via Carnegie

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Mihai Andrei

Mihai Andrei

Dr. Andrei Mihai is a geophysicist and founder of ZME Science. He has a Ph.D. in geophysics and archaeology and has completed courses from prestigious universities (with programs ranging from climate and astronomy to chemistry and geology). He is passionate about making research more accessible to everyone and communicating news and features to a broad audience.

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