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Extreme pressure causes osmium to change state of matter
by Staff Writers
Lemont IL (SPX) Sep 13, 2015

A schematic of the pressure chamber of the double-stage diamond anvil cell (dsDAC) for ultra-high pressure generation and a photo of a DAC produced at BGI. Semi-balls made of nanocrystalline diamond of extraordinary strength are attached to the culets of the opposed gem quality diamonds of the DAC. A sample of osmium, shown as a small red dot on the top of the lower semi-ball, has a size of ca. 3 microns. It is compressed between the tips of the semi-balls, which are supported by a pressure-medium (solidified inert gases or paraffin) filling the pressure chamber of the DAC. Ultra-high pressure is generated on the sample due to the two-stage exertion of a big force on a very small area. The diameter of the semi-balls is about 10 microns. The diameter of culets of the diamonds, to which the semi-balls are attached, is 250 microns. Image courtesy Elena Bykova, University of Bayreuth. (Click to view larger.)

Using metallic osmium (Os) in experimentation, an international group of researchers have demonstrated that ultra-high pressures cause core electrons to interplay, which results in experimentally observed anomalies in the compression behavior of the material.

Os is one of Earth's most exceptional elemental materials, possessing the highest known density at ambient pressure, one of the highest cohesive energies and melting temperatures, and an incompressibility that is almost comparable to that of diamond.

Researchers believe that the ability to affect core electrons - which do not participate in chemical bonding - in metals like osmium will open new opportunities in the search for new states of matter and the synthesis of materials with unique properties that do not exist at ambient conditions.

"The international research team employed extreme conditions that generated a measurable change in osmium's high pressure behavior," said Vitali Prakapenka, a scientist at the University of Chicago's GeoSoilEnviros Center for Advanced Radiation Sources (GSECARS) beamline at the Advanced Photon Source (APS), a U.S. Department of Energy's (DOE) Office of Science User Facility at DOE's Argonne National Laboratory.

"Although the theoretically predicted electronic transition that involves pressure-induced interaction between core (inner) electrons is much weaker than typical structural changes associated with valence (outer) electrons, we were able to detect experimentally changes in properties of this highly-compressed material which are related to the predicted phenomenon," said Leonid Dubrovinsky of the Bayerisches Geoinstitut (BGI) at Bayreuth University in Germany.

"We used micro-anvils made of super hard nano-diamond to generate 770 gigapascals of pressure (more than 7 million of atmospheres, i.e. twice that of the center of the Earth) on the osmium sample," BGI's Natalia Dubrovinskaia said. The device for generating ultra-high static pressures - a two-stage diamond anvil cell - was developed by Dubrovinsky and Dubrovinskaia, who published this research technique in 2012.

"Measuring the effect of ultra-high pressure required very accurate structural X-ray diffraction experiments to reveal the anomalous behavior of the lattice parameters upon compression," Prakapenka said. "We used state-of-the-art synchrotron techniques capable of penetrating bulky pressure vessels to probe tiny samples with a typical size of around 1-4 microns. We have used a very intense tightly focused high-energy X-ray beam that is only available at third-generation synchrotron facilities."

The research is detailed in the paper "The most incompressible metal osmium at static pressure above 750 gigapascals," published in Nature.

The research team members are: L. Dubrovinsky, N. Dubrovinskaia,E. Bykova, and M. Bykov of the University of Bayreuth, Germany; V. Prakapenka and C. Prescher of the University of Chicago, Illinois; K. Glazyrin and H.P. Liermann of the Deutsches Elektronen Synchrotron, Germany; M. Hanfland of the European Synchrotron Radiation Facility, France; M. Elkhorn and Q. Feng of the Linkoping University, Sweden; L.V. Pourovskii of the Linkoping University and Centre de Physique Theorique, a joint center of the Centre National de la Recherche Scientifique and the E'cole Polytechnique, France; M.I Katsnelson of Radboud University, The Netherlands, and Ural Federal University, Russia; J.M. Wills of Los Alamos National Laboratory, New Mexico and I.A. Abrikosov, of the National University of Science and Technology, Russia, and Linkoping University.

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