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| VOLUME 106 (2017) | ISSUE 11 | PAGE 702 |
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Structural transitions in elemental tin at ultra high pressures up to 230 GPa
A. G. Gavriliuka,b,c, I. A. Troyana,b,c, A. G. Ivanovaa,b, S. N. Aksenova,b, S. S. Starchikova,b, I. S. Lyubutina, W. Morgenrothd, K. V. Glazyrine, M. Mezouarf
aShubnikov Institute of Crystallography of FSRC "Crystallography and Photonics" RAS, 119333 Moscow, Russia bInstitute for Nuclear Research, Russian Academy of Sciences, 108840 Troitsk, Russia cREC "Functional Nanomaterialsôô, Immanuel Kant Baltic Federal University, 236041 Kaliningrad, Russia dInstitut fur Geowissenschaften, Goethe-Universität, 60438 Frankfurt am Main, Germany eDeutsches Elektronen-Synchrotron DESY, Photon Science, 22607 Hamburg, Germany fEuropean Synchrotron Radiation Facility, CS40220, F-38043 Grenoble Cedex 9, France
Abstract
The crystal structure of elemental Sn was investigated by synchrotron X-ray diffraction at ultra high pressures up to  230 GPa creating in diamond anvil cells. Above 70 GPa, a pure bcc
structure of Sn was observed, which is stable up to
160 GPa, until an occurrence of the hcp phase was revealed.
At the onset of the bcc-hcp transition at pressure of about
160 GPa, the drop of the unit cell volume is about 1 %.
A mixture of the bcc-hcp states was observed at least up to
230 GPa, and it seems that this state could exist even up
to higher pressures. The fractions of the bcc and hcp phases were
evaluated in the pressure range of the phase coexistence 160-230 GPa.
The difference between static and dynamic
compression and its effect on the V-P phase diagram of Sn are discussed.
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