Identification of superlattice structure cI16 in the P-VI phase of phosphorus at 340 GPa and room temperature via x-ray diffraction

Toshiyuki Sugimoto, Yuichi Akahama, Hiroshi Fujihisa, Yoshiki Ozawa, Hiroshi Fukui, Naohisa Hirao, and Yasuo Ohishi
Phys. Rev. B 86, 024109 – Published 30 July 2012

Abstract

The structural phase transitions of phosphorus (P) were investigated at pressures up to 340 GPa by a synchrotron radiation x-ray powder diffraction technique at room temperature. The transition from the simple hexagonal P-V to the P-VI phases was confirmed at 262 GPa. The results of full-profile Rietveld refinements indicate that the structure of the P-VI phase is a 2×2×2 superlattice of the bcc structure [cI16 (space group: I-43d)], which is isotypic to high-pressure phases of Li and Na. This phase was found to be stable up to 340 GPa. The results have demonstrated the extension of structure refinement to a complex high-pressure phase above 300 GPa by the x-ray diffraction method.

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  • Received 21 April 2012

DOI:https://doi.org/10.1103/PhysRevB.86.024109

©2012 American Physical Society

Authors & Affiliations

Toshiyuki Sugimoto1, Yuichi Akahama1,*, Hiroshi Fujihisa2, Yoshiki Ozawa1, Hiroshi Fukui1, Naohisa Hirao3, and Yasuo Ohishi3

  • 1Graduate School of Material Science, University of Hyogo, 3-2-1 Kouto, Kamigohri, Hyogo, 678-1297 Japan
  • 2National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
  • 3Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Mikazuki, Sayo-gun, Hyogo 679-5198, Japan

  • *Corresponding author: akahama@sci.u-hyogo.ac.jp

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Issue

Vol. 86, Iss. 2 — 1 July 2012

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