High-pressure single-crystal X-ray diffraction and synchrotron Mössbauer study of monoclinic ferrosilite
- California Inst. of Technology (CalTech), Pasadena, CA (United States); École Normale Supérieure de Lyon, Lyon (France)
- California Inst. of Technology (CalTech), Pasadena, CA (United States)
- California Inst. of Technology (CalTech), Pasadena, CA (United States); Univ. of Hawaii, Manoa, HI (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Santa Cruz, CA (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States)
The phase and spin transitions in single-crystal monoclinic ferrosilite, FeSiO3, were investigated using X-ray diffraction and Mössbauer spectroscopy up to lower-mantle pressures and room temperature in a helium pressure medium. Using single-crystal X-ray diffraction, we measured the equation of state of ferrosilite up to about 43 GPa. We observed a P21/c-to-C2/c phase transition between 1.5 and 1.7 GPa and a phase transition from C2/c to a distinct P21/c structure between 30 and 34 GPa. With time-domain Mössbauer spectroscopy, we determined the hyperfine parameters of ferrous iron up to 95 GPa. The phase transitions were correlated with discontinuities in Mössbauer spectral features. We observed the onset of high-spin-to-low-spin transitions in the M1 and M2 sites at ~37 GPa and ~74 GPa, respectively. In conclusion, understanding the electronic structure of iron in a well-characterized single crystal of ferrosilite may help interpret the behavior of iron in complex dense silicate phases.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- Grant/Contract Number:
- AC02-06CH11357; AC02-05CH11231
- OSTI ID:
- 1558793
- Alternate ID(s):
- OSTI ID: 1616972
- Journal Information:
- Comptes Rendus Geoscience, Vol. 351, Issue 2-3; ISSN 1631-0713
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Penta- and hexa-coordinated beryllium and phosphorus in high-pressure modifications of CaBe2P2O8
|
journal | June 2019 |
Penta- and hexa-coordinated beryllium and phosphorus in high-pressure modifications of $CaBe_{2}P_{2}O_{8}$
|
text | January 2019 |
Penta- and hexa-coordinated beryllium and phosphorus in high-pressure modifications of $CaBe_{2}P_{2}O_{8}$
|
text | January 2019 |
A Synchrotron Mössbauer Spectroscopy Study of a Hydrated Iron-Sulfate at High Pressures
|
journal | February 2020 |
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