Possible H2O storage in the crystal structure of CaSiO3 perovskite

Chen, H.; Leinenweber, K.; Prakapenka, V.; Prescher, C.; Meng, Y.; Bechtel, H.; Kunz, M.; Shim, S. -H.

doi:10.1016/j.pepi.2019.106412

Title: Possible H₂O storage in the crystal structure of CaSiO₃ perovskite

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Abstract

The lower mantle is believed to contain much less hydrogen (or H₂O) because of the low storage capacity of the dominant mineral phases, such as bridgmanite and ferropericlase. However, possible hydrogen storage in the third most abundant mineral in the region, CaSiO₃ perovskite (Ca-Pv), is not well unknown. Here, we have synthesized Ca-Pv from different starting materials with varying H₂O contents at 19–120 GPa and 1400–2200 K in laser-heated diamond-anvil cell. While cubic perovskite structure is stable at the mantle-related pressures-temperatures (P-T) in anhydrous systems, we found non-cubic diffraction peak splitting in Ca-Pv even at high temperatures when it is synthesized from hydrous starting materials. In-situ high-pressure infrared spectroscopy showed OH vibration possibly from Ca-Pv. The unit-cell volume of hydrothermally synthesized Ca-Pv is systematically smaller than that of anhydrous Ca-Pv at high pressures. These observations suggest possible H2O storage in Ca-Pv at mantle-related P-T conditions. We also found the formation of separate δ–AlOOH and Ca-Pv phases from Al-bearing CaSiO₃ glass starting materials in an H₂O medium at 60 GPa and 1400 K. Ca-Pv still showed non-cubic peak splitting at high temperatures in this experiment. Therefore, it is possible that hydrous phases may coexist together with hydrous Ca-Pv in the lowermore » mantle.« less

Authors:

Chen, H. ^[1]; Leinenweber, K. ^[1]; Prakapenka, V. ^[2]; Prescher, C. ^[3]; Meng, Y. ^[4]; Bechtel, H. ^[5]; Kunz, M. ^[5]; Shim, S. -H. ^[1]

Arizona State Univ., Tempe, AZ (United States)
Univ. of Chicago, IL (United States)
Univ. of Chicago, IL (United States); Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

Publication Date:: Mon Dec 23 00:00:00 EST 2019

Research Org.:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); National Aeronautics and Space Administration (NASA)

OSTI Identifier:: 1756050

Alternate Identifier(s):: OSTI ID: 1702138

Grant/Contract Number:: AC02-06CH11357; AC02-05CH11231; EAR1338810; 80NSSC18K0353; EAR-1228799; FG02-94ER14466; NA0001974; FG02-99ER45775

Resource Type:: Accepted Manuscript

Journal Name:: Physics of the Earth and Planetary Interiors

Additional Journal Information:: Journal Volume: 299; Journal ID: ISSN 0031-9201

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 58 GEOSCIENCES; CaSiO3 perovskite; Mantle; Water

Citation Formats


                    Chen, H., Leinenweber, K., Prakapenka, V., Prescher, C., Meng, Y., Bechtel, H., Kunz, M., and Shim, S. -H. Possible H2O storage in the crystal structure of CaSiO3 perovskite.  United States: N. p., 2019. 
Web.  doi:10.1016/j.pepi.2019.106412.

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                    Chen, H., Leinenweber, K., Prakapenka, V., Prescher, C., Meng, Y., Bechtel, H., Kunz, M., & Shim, S. -H. Possible H2O storage in the crystal structure of CaSiO3 perovskite.  United States.  https://doi.org/10.1016/j.pepi.2019.106412

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                    Chen, H., Leinenweber, K., Prakapenka, V., Prescher, C., Meng, Y., Bechtel, H., Kunz, M., and Shim, S. -H. Mon .  
"Possible H2O storage in the crystal structure of CaSiO3 perovskite".  United States.  https://doi.org/10.1016/j.pepi.2019.106412.  https://www.osti.gov/servlets/purl/1756050.

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@article{osti_1756050,

  title        = {Possible H2O storage in the crystal structure of CaSiO3 perovskite},

  author       = {Chen, H. and Leinenweber, K. and Prakapenka, V. and Prescher, C. and Meng, Y. and Bechtel, H. and Kunz, M. and Shim, S. -H.},

  abstractNote = {The lower mantle is believed to contain much less hydrogen (or H2O) because of the low storage capacity of the dominant mineral phases, such as bridgmanite and ferropericlase. However, possible hydrogen storage in the third most abundant mineral in the region, CaSiO3 perovskite (Ca-Pv), is not well unknown. Here, we have synthesized Ca-Pv from different starting materials with varying H2O contents at 19–120 GPa and 1400–2200 K in laser-heated diamond-anvil cell. While cubic perovskite structure is stable at the mantle-related pressures-temperatures (P-T) in anhydrous systems, we found non-cubic diffraction peak splitting in Ca-Pv even at high temperatures when it is synthesized from hydrous starting materials. In-situ high-pressure infrared spectroscopy showed OH vibration possibly from Ca-Pv. The unit-cell volume of hydrothermally synthesized Ca-Pv is systematically smaller than that of anhydrous Ca-Pv at high pressures. These observations suggest possible H2O storage in Ca-Pv at mantle-related P-T conditions. We also found the formation of separate δ–AlOOH and Ca-Pv phases from Al-bearing CaSiO3 glass starting materials in an H2O medium at 60 GPa and 1400 K. Ca-Pv still showed non-cubic peak splitting at high temperatures in this experiment. Therefore, it is possible that hydrous phases may coexist together with hydrous Ca-Pv in the lower mantle.},

  doi          = {10.1016/j.pepi.2019.106412},

  journal      = {Physics of the Earth and Planetary Interiors},

  number       = ,

  volume       = 299,

  place        = {United States},

  year         = {Mon Dec 23 00:00:00 EST 2019},

  month        = {Mon Dec 23 00:00:00 EST 2019}

}

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Title: Possible H2O storage in the crystal structure of CaSiO3 perovskite

Abstract

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Title: Possible H₂O storage in the crystal structure of CaSiO₃ perovskite