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Title: Discovery of a hexagonal ultradense hydrous phase in (Fe,Al)OOH

Abstract

A deep lower-mantle (DLM) water reservoir depends on availability of hydrous minerals which can store and transport water into the DLM without dehydration. Recent discoveries found hydrous phases AlOOH (Z= 2) with a CaCl 2-type structure and FeOOH (Z= 4) with a cubic pyrite-type structure stable under the high-pressure–temperature (P-T) conditions of the DLM. Our experiments at 107–136 GPa and 2,400 K have further demonstrated that (Fe,Al)OOH is stabilized in a hexagonal lattice. By combining powder X-ray-diffraction techniques with multigrain indexation, we are able to determine this hexagonal hydrous phase witha= 10.5803(6) Å andc= 2.5897(3) Å at 110 GPa. Hexagonal (Fe,Al)OOH can transform to the cubic pyrite structure at lowTwith the same density. Furthermore, the hexagonal phase can be formed when δ-AlOOH incorporates FeOOH produced by reaction between water and Fe, which may store a substantial quantity of water in the DLM.

Authors:
 [1];  [1];  [2];  [3]
  1. Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
  2. Carnegie Inst. of Science, Washington, DC (United States). Geophysical Lab., High Pressure Collaborative Access Team
  3. Center for High Pressure Science and Technology Advanced Research, Shanghai (China); Carnegie Inst. of Science, Washington, DC (United States). Geophysical Lab.
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
National Natural Science Foundation of China (NNSFC); Foundation of President of China Academy of Engineering Physics; National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
OSTI Identifier:
1430340
Grant/Contract Number:  
41574080; U1530402; 201402032; EAR-1345112; EAR-1447438; NA0001974; FG02-99ER45775; AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Volume: 115; Journal Issue: 12; Journal ID: ISSN 0027-8424
Publisher:
National Academy of Sciences
Country of Publication:
United States
Language:
ENGLISH
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; X-ray diffraction; hydrous mineral; lower mantle; deep-water cycle

Citation Formats

Zhang, Li, Yuan, Hongsheng, Meng, Yue, and Mao, Ho-kwang. Discovery of a hexagonal ultradense hydrous phase in (Fe,Al)OOH. United States: N. p., 2018. Web. doi:10.1073/pnas.1720510115.
Zhang, Li, Yuan, Hongsheng, Meng, Yue, & Mao, Ho-kwang. Discovery of a hexagonal ultradense hydrous phase in (Fe,Al)OOH. United States. doi:10.1073/pnas.1720510115.
Zhang, Li, Yuan, Hongsheng, Meng, Yue, and Mao, Ho-kwang. Mon . "Discovery of a hexagonal ultradense hydrous phase in (Fe,Al)OOH". United States. doi:10.1073/pnas.1720510115. https://www.osti.gov/servlets/purl/1430340.
@article{osti_1430340,
title = {Discovery of a hexagonal ultradense hydrous phase in (Fe,Al)OOH},
author = {Zhang, Li and Yuan, Hongsheng and Meng, Yue and Mao, Ho-kwang},
abstractNote = {A deep lower-mantle (DLM) water reservoir depends on availability of hydrous minerals which can store and transport water into the DLM without dehydration. Recent discoveries found hydrous phases AlOOH (Z= 2) with a CaCl2-type structure and FeOOH (Z= 4) with a cubic pyrite-type structure stable under the high-pressure–temperature (P-T) conditions of the DLM. Our experiments at 107–136 GPa and 2,400 K have further demonstrated that (Fe,Al)OOH is stabilized in a hexagonal lattice. By combining powder X-ray-diffraction techniques with multigrain indexation, we are able to determine this hexagonal hydrous phase witha= 10.5803(6) Å andc= 2.5897(3) Å at 110 GPa. Hexagonal (Fe,Al)OOH can transform to the cubic pyrite structure at lowTwith the same density. Furthermore, the hexagonal phase can be formed when δ-AlOOH incorporates FeOOH produced by reaction between water and Fe, which may store a substantial quantity of water in the DLM.},
doi = {10.1073/pnas.1720510115},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
issn = {0027-8424},
number = 12,
volume = 115,
place = {United States},
year = {2018},
month = {3}
}

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