Sound velocities in shock-synthesized stishovite to 72 GPa

Berryman, Eleanor J.; Winey, J. M.; Gupta, Yogendra M.; Duffy, Thomas S.
Issue date: 2019
Rights:
Creative Commons Attribution 4.0 International (CC BY)
Cite as:
Berryman, Eleanor J., Winey, J. M., Gupta, Yogendra M., & Duffy, Thomas S. (2019). Sound velocities in shock-synthesized stishovite to 72 GPa [Data set]. Princeton University. https://doi.org/10.34770/68ej-gh26
@electronic{berryman_eleanor_j_2019,
  author      = {Berryman, Eleanor J. and
                Winey, J. M. and
                Gupta, Yogendra M. and
                Duffy, Thomas S.},
  title       = {{Sound velocities in shock-synthesized st
                ishovite to 72 GPa}},
  publisher   = {{Princeton University}},
  year        = 2019,
  url         = {https://doi.org/10.34770/68ej-gh26}
}
Description:

Stishovite (rutile-type SiO2) is the archetype of dense silicates and may occur in post-garnet eclogitic rocks at lower-mantle conditions. Sound velocities in stishovite are fundamental to understanding its mechanical and thermodynamic behavior at high pressure and temperature. Here, we use plate-impact experiments combined with velocity interferometry to determine the stress, density, and longitudinal sound speed in stishovite formed during shock compression of fused silica at 44 GPa and above. The measured sound speeds range from 12.3(8) km/s at 43.8(8) GPa to 9.8(4) km/s at 72.7(11) GPa. The decrease observed at 64 GPa reacts a decrease in the shear modulus of stishovite, likely due to the onset of melting. By 72 GPa, the measured sound speed agrees with the theoretical bulk sound speed indicating loss of all shear stiffness due to complete melting. Our sound velocity results provide direct evidence for shock-induced melting, in agreement with previous pyrometry data.

Show More
# Filename Filesize
1 17-2S33 PDV.csv 30.4 KB
2 17-2S33 VISAR.csv 1.05 MB
3 17-2S37 PDV.csv 24.3 KB
4 17-2S37 VISAR.csv 221 KB
5 17-2S49 PDV.csv 49.9 KB
6 17-2S49 VISAR.csv 396 KB
7 17-2S50 PDV.csv 53.6 KB
8 17-2S50 VISAR.csv 216 KB
9 18-2S13 PDV.csv 45.8 KB
10 18-2S13 VISAR.csv 312 KB
11 18-2S14 PDV.csv 61.4 KB
12 18-2S14 VISAR.csv 754 KB
13 18-2S15 PDV.csv 145 KB
14 18-2S15 VISAR.csv 689 KB
15 18-2SH06 PDV.csv 37.8 KB
16 18-2SH06 VISAR.csv 421 KB
17 18-2SH10 PDV.csv 21.8 KB
18 18-2SH10 VISAR.csv 281 KB
19 18-2SH13 PDV.csv 29.2 KB
20 18-2SH13 VISAR.csv 344 KB
21 18-2SH15 PDV.csv 43.7 KB
22 18-2SH15 VISAR.csv 557 KB
23 18-2SH16 PDV.csv 36.4 KB
24 18-2SH16 VISAR.csv 379 KB
25 READ ME.txt 1.7 KB