Pressure-induced isostructural phase transformation in γ-B28

Evgeniya Zarechnaya, Natalia Dubrovinskaia, Razvan Caracas, Marco Merlini, Michael Hanfland, Yaroslav Filinchuk, Dmitry Chernyshov, Vladimir Dmitriev, and Leonid Dubrovinsky
Phys. Rev. B 82, 184111 – Published 18 November 2010

Abstract

Isostructural phase transformations (ISPhTs) so far were reported only for heavy elements and their compounds with complex electronic and/or magnetic structures. Studies of one of the lightest elemental material, high-pressure boron γ-B28, by means of in situ single-crystal x-ray diffraction and Raman spectroscopy reveal abrupt changes in the compressional behavior and Raman spectra at 40 GPa. Combined experimental and ab initio theoretical analysis of the structural and vibrational properties of γ-B28 suggests that the ISPhT under compression is due to the changes in the polarity of the covalent bonds between the boron atoms in the complex quasimolecular structure of γ-B28.

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  • Received 15 October 2010

DOI:https://doi.org/10.1103/PhysRevB.82.184111

©2010 American Physical Society

Authors & Affiliations

Evgeniya Zarechnaya1, Natalia Dubrovinskaia2,3,*, Razvan Caracas4, Marco Merlini5, Michael Hanfland6, Yaroslav Filinchuk6, Dmitry Chernyshov6, Vladimir Dmitriev6, and Leonid Dubrovinsky1

  • 1Bayerisches Geoinstitut, Universität Bayreuth, 95440 Bayreuth, Germany
  • 2Mineralphysik, Institut für Geowissenschaften, Universität Heidelberg, 69120 Heidelberg, Germany
  • 3Lehrstuhl für Kristallographie, Physikalisches Institut, Universität Bayreuth, 95440 Bayreuth, Germany
  • 4Ecole Normale Supérieure de Lyon, Laboratoire de Sciences de la Terre, Centre National de la Recherche Scientifique, 46, allée d'Italie, 69364 Lyon Cedex 07, France
  • 5Dipartimento di Scienze della Terra, Universita degli Studi di Milano, Via Botticelli 23, 20133 Milano, Italy
  • 6ESRF, Boîte Postale 220, 38043 Grenoble, France

  • *Author to whom correspondence should be addressed; natalia.dubrovinskaia@geow.uni-heidelberg.de

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Vol. 82, Iss. 18 — 1 November 2010

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