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Title: Persistent Octahedral Coordination in Amorphous GeO 2 Up to 100 GPa by K β ' ' X-Ray Emission Spectroscopy

Journal Article · · Physical Review. X
 [1];  [2];  [3];  [4];  [3];  [5];  [6];  [7];  [8];  [9];  [10];  [2];  [11];  [12];  [8]
  1. Univ. Potsdam, Potsdam (Germany); Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Deutsches GeoForschungsZentrum GFZ, Potsdam (Germany)
  2. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  3. European Synchrotron Radiation Facility, Grenoble (France)
  4. European XFEL, Schenefeld (Germany)
  5. Univ. Bayreuth, Bayreuth (Germany)
  6. Univ. Potsdam, Potsdam (Germany)
  7. Univ. Potsdam, Potsdam (Germany); European XFEL, Schenefeld (Germany)
  8. Technische Univ. Dortmund, Dortmund (Germany)
  9. Univ. Frankfurt, Frankfurt am Main (Germany)
  10. Univ. of Saskatchewan, Saskatoon, SK (Canada)
  11. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Tokyo Institute of Technology, Tokyo (Japan)
  12. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); SLAC National Accelerator Lab., Menlo Park, CA (United States)
+ Show Author Affiliations

We measure valence-to-core x-ray emission spectra of compressed crystalline GeO2 up to 56 GPa and of amorphous GeO2 up to 100 GPa. In a novel approach, we extract the Ge coordination number and mean Ge-O distances from the emission energy and the intensity of the Kβ" emission line. Here, the spectra of high-pressure polymorphs are calculated using the Bethe-Salpeter equation. Trends observed in the experimental and calculated spectra are found to match only when utilizing an octahedral model. The results reveal persistent octahedral Ge coordination with increasing distortion, similar to the compaction mechanism in the sequence of octahedrally coordinated crystalline GeO2 high-pressure polymorphs.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1503078
Journal Information:
Physical Review. X, Journal Name: Physical Review. X Journal Issue: 1 Vol. 9; ISSN PRXHAE; ISSN 2160-3308
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

Density of amorphous Ge O 2 to 133 GPa with possible pyritelike structure and stiffness at high pressure journal December 2019
Density of amorphous $GeO_{2}$ to 133 GPa with possible pyritelike structure and stiffness at high pressure text January 2019

Figures / Tables (12)

FIG. 11(p. 15)figure FIG. 11
Figure 1(p. 3)figure Figure 1
FIG. 12(p. 16)figure FIG. 12
FIG. 2(p. 6)figure FIG. 2
Figure 4(p. 12)figure Figure 4
FIG. 15(p. 20)figure FIG. 15
FIG. 16(p. 20)figure FIG. 16
Table 1(p. 2)table Table 1
FIG. 18(p. 22)figure FIG. 18
Figure 3(p. 10)figure Figure 3
FIG. 17(p. 21)figure FIG. 17
Figure 2(p. 5)figure Figure 2

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36 MATERIALS SCIENCE