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

Zhang, Li; Yuan, Hongsheng; Meng, Yue; Mao, Ho-kwang

doi:10.1073/pnas.1720510115

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

Journal Article · Mon Mar 05 00:00:00 EST 2018 · Proceedings of the National Academy of Sciences of the United States of America

DOI:https://doi.org/10.1073/pnas.1720510115· OSTI ID:1430340

Zhang, Li ^[1]; Yuan, Hongsheng ^[1]; Meng, Yue ^[2]; Mao, Ho-kwang ^[3]

Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
Carnegie Inst. of Science, Washington, DC (United States). Geophysical Lab., High Pressure Collaborative Access Team
Center for High Pressure Science and Technology Advanced Research, Shanghai (China); Carnegie Inst. of Science, Washington, DC (United States). Geophysical Lab.

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.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: National Natural Science Foundation of China (NSFC); 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

Grant/Contract Number:: 41574080; U1530402; 201402032; EAR-1345112; EAR-1447438; NA0001974; FG02-99ER45775; AC02-06CH11357

OSTI ID:: 1430340

Journal Information:: Proceedings of the National Academy of Sciences of the United States of America, Vol. 115, Issue 12; ISSN 0027-8424

Publisher:: National Academy of SciencesCopyright Statement

Country of Publication:: United States

Language:: ENGLISH

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Cited by: 15 works

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

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