In-situ crystal structure determination of seifertite SiO 2 at 129 GPa: Studying a minor phase near Earth’s core–mantle boundary
Abstract
Seifertite SiO₂ likely exists as a minor phase near the core–mantle boundary. By simulating the pressure and temperature conditions near the core–mantle boundary, seifertite was synthesized as a minor phase in a coarse-grained, polycrystalline sample coexisting with the (Mg,Fe)SiO₃ post-perovskite (pPv) phase at 129 GPa and 2500 K. Here we report the first in situ single-crystal structure determination and refinement of seifertite at high pressure and after a temperature quench from laser heating. We improved the data coverage of a minor phase from a diamond-anvil cell (DAC) by merging single-crystal data of seifertite from six selected grains that had different orientations. Observed systematic absences of reflections from the six individual grains allowed only one space group: Pbcn. The refined results of seifertite are in good agreement with the predictions from previous first-principles calculations at high pressure. This approach provides a method for structure determination of a minor phase in a mineral assemblage synthesized under P-T conditions representative of the deep Earth.
- Authors:
-
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai (China)
- Carnegie Inst. of Science, Argonne, IL (United States). High Pressure Collaborative Access Team (HPCAT)
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai (China); Carnegie Inst. of Science, Washington, DC (United States). Geophysical Lab.
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai (China); Carnegie Inst. of Science, Argonne, IL (United States). High Pressure Synergetic Consortium (HPSync)
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC); National Science Foundation (NSF)
- OSTI Identifier:
- 1235471
- Grant/Contract Number:
- NA0001974; FG02-99ER45775; AC02-06CH11357; 201402032; 41574080; U1530402; EAR-1345112; EAR-1447438
- Resource Type:
- Accepted Manuscript
- Journal Name:
- American Mineralogist
- Additional Journal Information:
- Journal Volume: 101; Journal Issue: 1; Journal ID: ISSN 0003-004X
- Publisher:
- Mineralogical Society of America
- Country of Publication:
- United States
- Language:
- ENGLISH
- Subject:
- 58 GEOSCIENCES; High pressure; crystal structure; multigrain; SiO2; seifertite; synchrotron X-ray; deep mantle
Citation Formats
Zhang, Li, Popov, Dmitry, Meng, Yue, Wang, Junyue, Ji, Cheng, Li, Bing, and Mao, Ho-kwang. In-situ crystal structure determination of seifertite SiO 2 at 129 GPa: Studying a minor phase near Earth’s core–mantle boundary. United States: N. p., 2016.
Web. doi:10.2138/am-2016-5525.
Zhang, Li, Popov, Dmitry, Meng, Yue, Wang, Junyue, Ji, Cheng, Li, Bing, & Mao, Ho-kwang. In-situ crystal structure determination of seifertite SiO 2 at 129 GPa: Studying a minor phase near Earth’s core–mantle boundary. United States. https://doi.org/10.2138/am-2016-5525
Zhang, Li, Popov, Dmitry, Meng, Yue, Wang, Junyue, Ji, Cheng, Li, Bing, and Mao, Ho-kwang. Fri .
"In-situ crystal structure determination of seifertite SiO 2 at 129 GPa: Studying a minor phase near Earth’s core–mantle boundary". United States. https://doi.org/10.2138/am-2016-5525. https://www.osti.gov/servlets/purl/1235471.
@article{osti_1235471,
title = {In-situ crystal structure determination of seifertite SiO 2 at 129 GPa: Studying a minor phase near Earth’s core–mantle boundary},
author = {Zhang, Li and Popov, Dmitry and Meng, Yue and Wang, Junyue and Ji, Cheng and Li, Bing and Mao, Ho-kwang},
abstractNote = {Seifertite SiO₂ likely exists as a minor phase near the core–mantle boundary. By simulating the pressure and temperature conditions near the core–mantle boundary, seifertite was synthesized as a minor phase in a coarse-grained, polycrystalline sample coexisting with the (Mg,Fe)SiO₃ post-perovskite (pPv) phase at 129 GPa and 2500 K. Here we report the first in situ single-crystal structure determination and refinement of seifertite at high pressure and after a temperature quench from laser heating. We improved the data coverage of a minor phase from a diamond-anvil cell (DAC) by merging single-crystal data of seifertite from six selected grains that had different orientations. Observed systematic absences of reflections from the six individual grains allowed only one space group: Pbcn. The refined results of seifertite are in good agreement with the predictions from previous first-principles calculations at high pressure. This approach provides a method for structure determination of a minor phase in a mineral assemblage synthesized under P-T conditions representative of the deep Earth.},
doi = {10.2138/am-2016-5525},
journal = {American Mineralogist},
number = 1,
volume = 101,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 2016},
month = {Fri Jan 01 00:00:00 EST 2016}
}
Web of Science
Works referencing / citing this record:
Ab Initio Molecular Dynamics Investigation of Molten Fe–Si–O in Earth's Core
journal, June 2019
- Huang, Dongyang; Badro, James; Brodholt, John
- Geophysical Research Letters, Vol. 46, Issue 12
Contributed Review: Culet diameter and the achievable pressure of a diamond anvil cell: Implications for the upper pressure limit of a diamond anvil cell
journal, November 2018
- O’Bannon, Earl F.; Jenei, Zsolt; Cynn, Hyunchae
- Review of Scientific Instruments, Vol. 89, Issue 11
High-pressure studies with x-rays using diamond anvil cells
journal, November 2016
- Shen, Guoyin; Mao, Ho Kwang
- Reports on Progress in Physics, Vol. 80, Issue 1