Phase stability of iron germanate, FeGeO3, to 127 GPa
Abstract
The high-pressure behavior of germanates is of interest as these compounds serve as analogs for silicates of the deep Earth. Current theoretical and experimental studies of iron germanate, FeGeO3, are limited. Here in this paper, we have examined the behavior of FeGeO3 to 127 GPa using the laser-heated diamond anvil cell combined with in situ synchrotron X-ray diffraction. Upon compression at room temperature, the ambient-pressure clinopyroxene phase transforms to a disordered triclinic phase [FeGeO3 (II)] at ~ 18 GPa in agreement with earlier studies. An additional phase transition to FeGeO3 (III) occurs above 54 GPa at room temperature. Laser-heating experiments (~ 1200–2200 K) were conducted at three pressures (33, 54, and 123 GPa) chosen to cover the stability regions of different GeO2 polymorphs. In all cases, we observe that FeGeO3 dissociates into GeO2 + FeO at high pressure and temperature conditions. Neither the perovskite nor the post-perovskite phase was observed up to 127 GPa at ambient or high temperatures. The results are consistent with the behavior of FeSiO3, which also dissociates into a mixture of the oxides (FeO + SiO2) at least up to 149 GPa.
- Authors:
-
- Princeton Univ., NJ (United States). Department of Geosciences
- Princeton Univ., NJ (United States). Department of Chemistry; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
- Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Chicago, IL (United States). GeoSoilEnviroCARS
- Princeton Univ., NJ (United States). Department of Chemistry
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1440960
- Grant/Contract Number:
- AC02-05CH11231; FG02-94ER14466
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Physics and Chemistry of Minerals
- Additional Journal Information:
- Journal Volume: 45; Journal Issue: 4; Journal ID: ISSN 0342-1791
- Publisher:
- Springer
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 58 GEOSCIENCES; Germanates; Phase-transitions; Diamond anvil cell; High-pressure
Citation Formats
Dutta, R., Tracy, S. J., Stan, C. V., Prakapenka, V. B., Cava, R. J., and Duffy, T. S. Phase stability of iron germanate, FeGeO3, to 127 GPa. United States: N. p., 2017.
Web. doi:10.1007/s00269-017-0927-9.
Dutta, R., Tracy, S. J., Stan, C. V., Prakapenka, V. B., Cava, R. J., & Duffy, T. S. Phase stability of iron germanate, FeGeO3, to 127 GPa. United States. https://doi.org/10.1007/s00269-017-0927-9
Dutta, R., Tracy, S. J., Stan, C. V., Prakapenka, V. B., Cava, R. J., and Duffy, T. S. 2017.
"Phase stability of iron germanate, FeGeO3, to 127 GPa". United States. https://doi.org/10.1007/s00269-017-0927-9. https://www.osti.gov/servlets/purl/1440960.
@article{osti_1440960,
title = {Phase stability of iron germanate, FeGeO3, to 127 GPa},
author = {Dutta, R. and Tracy, S. J. and Stan, C. V. and Prakapenka, V. B. and Cava, R. J. and Duffy, T. S.},
abstractNote = {The high-pressure behavior of germanates is of interest as these compounds serve as analogs for silicates of the deep Earth. Current theoretical and experimental studies of iron germanate, FeGeO3, are limited. Here in this paper, we have examined the behavior of FeGeO3 to 127 GPa using the laser-heated diamond anvil cell combined with in situ synchrotron X-ray diffraction. Upon compression at room temperature, the ambient-pressure clinopyroxene phase transforms to a disordered triclinic phase [FeGeO3 (II)] at ~ 18 GPa in agreement with earlier studies. An additional phase transition to FeGeO3 (III) occurs above 54 GPa at room temperature. Laser-heating experiments (~ 1200–2200 K) were conducted at three pressures (33, 54, and 123 GPa) chosen to cover the stability regions of different GeO2 polymorphs. In all cases, we observe that FeGeO3 dissociates into GeO2 + FeO at high pressure and temperature conditions. Neither the perovskite nor the post-perovskite phase was observed up to 127 GPa at ambient or high temperatures. The results are consistent with the behavior of FeSiO3, which also dissociates into a mixture of the oxides (FeO + SiO2) at least up to 149 GPa.},
doi = {10.1007/s00269-017-0927-9},
url = {https://www.osti.gov/biblio/1440960},
journal = {Physics and Chemistry of Minerals},
issn = {0342-1791},
number = 4,
volume = 45,
place = {United States},
year = {Wed Nov 15 00:00:00 EST 2017},
month = {Wed Nov 15 00:00:00 EST 2017}
}
Web of Science
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Works referencing / citing this record:
Phase transitions beyond post-perovskite in NaMgF 3 to 160 GPa
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