Short-range order of compressed amorphous GeSe2
10.1038/srep10188
Crossref journal-article
Springer Science and Business Media LLC
Scientific Reports (297)
Abstract

AbstractThe structure of amorphous GeSe2 (a-GeSe2) has been studied by means of a combination of two-edges X-ray absorption spectroscopy (XAS) and angle-dispersive X-ray diffraction under pressures up to about 30 GPa. Multiple-edge XAS data-analysis of a-GeSe2 at ambient conditions allowed us to reconstruct and compare the first-neighbor distribution function with previous results obtained by neutron diffraction with isotopic substitution. GeSe2 is found to remain amorphous up to the highest pressures attained and a reversible 1.5 eV red-shift of the Ge K-edge energy indicating metallization, occurs between 10 GPa and 15 GPa. Two compression stages are identified by XAS structure refinement. First, a decrease of the first-neighbor distances up to about 10 GPa, in the same pressure region of a previously observed breakdown of the intermediate-range order. Second, an increase of the Ge-Se distances, bond disorder and of the coordination number. This stage is related to a reversible non-isostructural transition involving a gradual conversion from tetra- to octa-hedral geometry which is not yet fully completed at 30 GPa.

Authors 5
  1. L. Properzi (first)
  2. A. Di Cicco (additional)
  3. L. Nataf (additional)
  4. F. Baudelet (additional)
  5. T. Irifune (additional)
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Dates
Type When
Created 10 years, 3 months ago (May 14, 2015, 10:59 a.m.)
Deposited 2 years, 7 months ago (Jan. 5, 2023, 9:01 a.m.)
Indexed 3 months, 3 weeks ago (May 2, 2025, 12:09 a.m.)
Issued 10 years, 3 months ago (May 14, 2015)
Published 10 years, 3 months ago (May 14, 2015)
Published Online 10 years, 3 months ago (May 14, 2015)
Funders 0

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@article{Properzi_2015, title={Short-range order of compressed amorphous GeSe2}, volume={5}, ISSN={2045-2322}, url={http://dx.doi.org/10.1038/srep10188}, DOI={10.1038/srep10188}, number={1}, journal={Scientific Reports}, publisher={Springer Science and Business Media LLC}, author={Properzi, L. and Di Cicco, A. and Nataf, L. and Baudelet, F. and Irifune, T.}, year={2015}, month=may }