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Licensed Unlicensed Requires Authentication Published by De Gruyter August 28, 2019

Compressional behavior and spin state of δ-(Al,Fe)OOH at high pressures

  • Itaru Ohira EMAIL logo , Jennifer M. Jackson , Natalia V. Solomatova , Wolfgang Sturhahn , Gregory J. Finkelstein , Seiji Kamada , Takaaki Kawazoe , Fumiya Maeda , Naohisa Hirao , Satoshi Nakano , Thomas S. Toellner , Akio Suzuki and Eiji Ohtani
From the journal American Mineralogist


Hydrogen transport from the surface to the deep interior and distribution in the mantle are important in the evolution and dynamics of the Earth. An aluminum oxy-hydroxide, δ-AlOOH, might influence hydrogen transport in the deep mantle because of its high stability extending to lower mantle conditions. The compressional behavior and spin states of δ-(Al,Fe3+)OOH phases were investigated with synchrotron X‑ray diffraction and Mössbauer spectroscopy under high pressure and room temperature. Pressure-volume (P-V) profiles of the δ-(Al0.908(9)57Fe0.045(1))OOH1.14(3) [Fe/(Al+Fe) = 0.047(10), δ-Fe5] and the δ-(Al0.832(5)57Fe0.117(1))OOH1.15(3) [Fe/(Al+Fe) = 0.123(2), δ-Fe12] show that these hydrous phases undergo two distinct structural transitions involving changes in hydrogen bonding environments and a high- to low-spin crossover in Fe3+. A change of axial compressibility accompanied by a transition from an ordered (P21nm) to disordered hydrogen bond (Pnnm) occurs near 10 GPa for both δ-Fe5 and δ-Fe12 samples. Through this transition, the crystallographic a and b axes become stiffer, whereas the c axis does not show such a change, as observed in pure δ-AlOOH. A volume collapse due to a transition from high- to low-spin states in the Fe3+ ions is complete below 32–40 GPa in δ-Fe5 and δ-Fe12, which is ~10 GPa lower than that reported for pure e-FeOOH. Evaluation of the Mössbauer spectra of δ-(Al0.824(10)57Fe0.126(4))OOH1.15(4) [Fe/(Al+Fe) = 0.133(3), δ-Fe13] also indicate a spin transition between 32–45 GPa. Phases in the δ-(Al,Fe)OOH solid solution with similar iron concentrations as those studied here could cause an anomalously high r/vF ratio (bulk sound velocity, defined as K/ρ)at depths corresponding to the spin crossover region (~900 to ~1000 km depth), whereas outside the spin crossover region a low r/vF anomaly would be expected. These results suggest that the δ-(Al,Fe)OOH solid solution may play an important role in understanding the heterogeneous structure of the deep Earth.


We thank Y. Ito for his help with polishing and operating the EPMA for the crystals used in this work. We also thank R. Njul for his help with polishing some of the samples. We are grateful to the editor D. Hummer and two anonymous reviewers for comments that helped to improve the manuscript.

  1. Funding

    This work was supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Science, Sport and Technology of the Japanese Government to I.O. (JSPS KAKENHI Grant Number: JP16J04690), to E.O. (Number: JP15H05748), to S.K. (Numbers: 26247089, 15H05831, and 16K13902), to A.S. (Numbers: JP15H05828 and JP19H01985). This work and I.O. were supported by the International Research and Training Group “Deep Earth Volatile Cycles” funded by the German Science Foundation (Grant Number: GRK 2156/1), the JSPS Japanese-German Graduate Externship, and the International Joint Graduate Program in Earth and Environmental Science (GP-EES), Tohoku University. This work was also partially supported by a grant from the W.M. Keck Institute for Space Studies and the National Science Foundation (NSF-CSEDI-EAR-1600956) awarded to J.M.J. N.V.S. was partly funded by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement Number 681818–IMPACT). XRD measurements were performed at the BL10XU, SPring-8, Japan (proposal number: 2017A1650 to I.O., 2017A1251 to S.K., 2017A1673 to F.M., and 2015B0104, 2016A0104, and 2017B1514 to E.O.). SMS experiments were conducted at 3-ID-B, Advanced Photon Source, in the United States, which is partially supported by COMPRES.

References cited

Abe, R., Shibazaki, Y., Ozawa, S., Ohira, I., Tobe, H., and Suzuki, A. (2018) In situ X‑ray diffraction studies of hydrous aluminosilicate at high pressure and temperature. Journal of Mineralogical and Petrological Sciences, 113, 106–111.10.2465/jmps.170714Search in Google Scholar

Bell, D.R., and Rossman, G.R. (1992) Water in Earth’s mantle: the role of nominally anhydrous minerals. Science, 255, 1391–1397.10.1126/science.255.5050.1391Search in Google Scholar PubMed

Bindi, L., Nishi, M., Tsuchiya, J., and Irifune, T. (2014) Crystal chemistry of dense hydrous magnesium silicates: The structure of Phase H, MgSiH2O4 synthesized at 45 GPa and 1000 °C. American Mineralogist, 99, 1802–1805.10.2138/am.2014.4994Search in Google Scholar

Bower, D.J., Gurnis, M., and Seton, M. (2011) Lower mantle structure from paleo-geographically constrained dynamic Earth models. Geochemistry, Geophysics, Geosystems, 14, 44–63.10.1029/2012GC004267Search in Google Scholar

Bronstein, Y., Depondt, P., and Finocchi, F. (2017) Thermal and nuclear quantum effects in the hydrogen bond dynamical symmetrization phase transition of d-AlOOH. European Journal of Mineralogy, 29, 385–395.10.1127/ejm/2017/0029-2628Search in Google Scholar

Brown, J.M., and Shankland, T.J. (1981) Thermodynamic parameters in the Earth as determined from seismic profiles. Geophysical Journal of the Royal Astronomical Society, 66, 579–596.10.1111/j.1365-246X.1981.tb04891.xSearch in Google Scholar

Cedillo, A., Torrent, M., and Cortona, P. (2016) Stability of the different AlOOH phases under pressure. Journal of Physics: Condensed Matter, 28, 185401.10.1088/0953-8984/28/18/185401Search in Google Scholar PubMed

Chen, B., Jackson, J.M., Sturhahn, W., Zhang, D., Zhao, J., Wicks, J.K., and Murphy, C.A. (2012) Spin crossover equation of state and sound velocities of (Mg0.65Fe0.35O ferropericlase to 140 GPa. Journal of Geophysical Research, 117, B08208.Search in Google Scholar

Cortona, P. (2017) Hydrogen bond symmetrization and elastic constants under pressure of d-AlOOH. Journal of Physics: Condensed Matter, 29, 325505.10.1088/1361-648X/aa791fSearch in Google Scholar PubMed

Dewaele, A., Torrent, M., Loubeyre, P., and Mezouar, M. (2008) Compression curves of transition metals in the Mbar range: Experiments and projector augmented-wave calculations. Physical Review B, 78, 104102.10.1103/PhysRevB.78.104102Search in Google Scholar

Dorogokupets, P.I., and Oganov, A.R. (2006) Equations of state of Al, Au, Cu, Pt, Ta, and W and revised ruby pressure scale. Doklady Earth Sciences, 410, 1091–1095.10.1134/S1028334X06070208Search in Google Scholar

Duan, Y., Sun, N., Wang, S., Li, X., Guo, X., Ni, H., Prakapenka, V.B., and Mao, Z. (2018) Phase stability and thermal equation of state of d-AlOOH: Implication for water transportation to the Deep Lower Mantle. Earth and Planetary Science Letters, 494, 92–98.10.1016/j.epsl.2018.05.003Search in Google Scholar

Dziewonski, A.M., and Anderson, D.L. (1981) Preliminary reference Earth model. Physics of the Earth and Planetary Interiors, 25, 297–356.10.1016/0031-9201(81)90046-7Search in Google Scholar

Fei, Y., Zhang, L., Corgne, A., Watson, H., Ricolleau, A., Meng, Y., and Prakapenka, V. (2007) Spin transition and equations of state of (Mg, Fe)O solid solutions. Geophysical Research Letters, 34, L17307.10.1029/2007GL030712Search in Google Scholar

Fukuyama, K., Ohtani, E., Shibazaki, Y., Kagi, H., and Suzuki, A. (2017) Stability field of phase Egg, AlSiO3OH at high pressure and high temperature: possible water reservoir in mantle transition zone. Journal of Mineralogical and Petrological Sciences, 112, 31–35.10.2465/jmps.160719eSearch in Google Scholar

Gasparik, T., Tripathi, A., and Parise, J.B. (2000) Structure of a new Al-rich phase, [K, Na]0.9[Mg, Fe]2[Mg, Fe, Al, Si]6O12 synthesized at 24 GPa. American Mineralogist, 85, 613–618.10.2138/am-2000-0426Search in Google Scholar

Gleason, A.E., Jeanloz, R., and Kunz, M. (2008) Pressure-temperature stability studies of FeOOH using X-ray diffraction. American Mineralogist, 93, 1882–1885.10.2138/am.2008.2942Search in Google Scholar

Gleason, A.E., Quiroga, C.E., Suzuki, A., Pentcheva, R., and Mao, W.L. (2013) Symmetrization driven spin transition in e-FeOOH at high pressure. Earth and Planetary Science Letters, 379, 49–55.10.1016/j.epsl.2013.08.012Search in Google Scholar

Hsu, H. (2017) First-principles study of iron spin crossover in the new hexagonal aluminous phase. Physical Review B, 95, 020406.10.1103/PhysRevB.95.020406Search in Google Scholar

Irifune, T., and Ringwood, A.E. (1993) Phase transformations in subducted oceanic crust and buoyancy relationships at depths of 600–800 km in the mantle. Earth and Planetary Science Letters, 117, 101–110.10.1016/0012-821X(93)90120-XSearch in Google Scholar

Kagi, H., Ushijima, D., Sano-Furukawa, A., Komatsu, K., Iizuka, R., Nagai, T., and Nakano, S. (2010) Infrared absorption spectra of d-AlOOH and its deuteride at high pressure and implication to pressure response of the hydrogen bonds. Journal of Physics: Conference Series, 215, 012052.10.1088/1742-6596/215/1/012052Search in Google Scholar

Kaminsky, F.V. (2017) The Earth’s Lower Mantle, Composition and Structure, 331 p. Springer, Switzerland.10.1007/978-3-319-55684-0Search in Google Scholar

Kang, D., Feng, Y.-X., Yuan, Y., Ye, Q.-J., Zhu, F., Huo, H.-Y., Li, X.-Z., and Wu, X. (2017) Hydrogen-bond symmetrization of d-AlOOH. Chinese Physics Letters, 34, 108301.10.1088/0256-307X/34/10/108301Search in Google Scholar

Kawazoe, T., Ohira, I., Ishii, T., Boffa Ballaran, T., McCammon, C., Suzuki, A., and Ohtani, E. (2017) Single crystal synthesis of d-(Al,Fe)OOH. American Mineralogist, 102, 1953–1956.10.2138/am-2017-6153Search in Google Scholar

Komatsu, K., Kuribayashi, T., Sano, A., Ohtani, E., and Kudoh, Y. (2006) Redetermination of the high-pressure modification of AlOOH from single-crystal synchrotron data. Acta Crystallographica, E62, i216–218.10.1107/S160053680603916XSearch in Google Scholar

Kuribayashi, T., Sano-Furukawa, A., and Nagase, T. (2014) Observation of pressure-induced phase transition of d-AlOOH by using single-crystal synchrotron X‑ray diffraction method. Physics and Chemistry of Minerals, 41, 303–312.10.1007/s00269-013-0649-6Search in Google Scholar

Li, S., Ahuja, R., and Johansson, B. (2006) The elastic and optical properties of the high-pressure hydrous phase d-AlOOH. Solid State Communications, 137, 101–106.10.1016/j.ssc.2005.08.031Search in Google Scholar

Lin, J.F., Shu, J., Mao, H.K., Hemley, R.J., and Shen, G. (2003) Amorphous boron gasket in diamond anvil cell research. Review of Scientific Instruments, 74, 4732–4736.10.1063/1.1621065Search in Google Scholar

Lin, J.F., Struzhkin, V.V., Jacobsen, S.D., Hu, M.Y., Chow, P., Kung, J., Liu, H., Mao, H.-k., and Hemley, R.J. (2005) Spin transition of iron in magnesiowüstite in the Earth’s lower mantle. Nature, 436, 377–380.10.1038/nature03825Search in Google Scholar PubMed

Liu, X., Matsukage, K.N., Nishihara, Y., Suzuki, T., and Takahashi, E. (2019) Stability of the hydrous phases of Al-rich Phase D and Al-rich Phase H in deep subducted oceanic crust. American Mineralogist, 104, 64–72.10.2138/am-2019-6559Search in Google Scholar

Mashino, I., Murakami, M., and Ohtani, E. (2016) Sound velocities of d-AlOOH up to core-mantle boundary pressures with implications for the seismic anomalies in the deep mantle. Journal of Geophysical Research: Solid Earth, 121, 595–609.10.1002/2015JB012477Search in Google Scholar

Masters, G., Laske, G., Bolton, H., and Dziewonski, A. (2000) The relative behavior of shear velocity, bulk sound speed, and compressional velocity in the mantle: Implications for chemical and thermal structure. In S.-I. Karato, A. Forte, R. Liebermann, G. Masters, and L. Stixrude, Eds., Earth’s Deep Interior: Mineral physics and tomography from the atomic to the global scale. Geophysical Monograph 117, p. 63–87. American Geophysical Union.10.1029/GM117p0063Search in Google Scholar

Miura, H., Hamada, Y., Suzuki, T., Akaogi, M., Miyajima, N., and Fujino, K. (2000) Crystal structure of CaMg2Al6O12 a new Al-rich high pressure form. American Mineralogist, 85, 1799–1803.10.2138/am-2000-11-1223Search in Google Scholar

Miyajima, N., Yagi, T., Hirose, K., Kondo, T., Fujino, K., and Miura, H. (2001) Potential host phase of aluminum and potassium in the Earth’s lower mantle. American Mineralogist, 86, 740–746.10.2138/am-2001-5-614Search in Google Scholar

Nishi, M., Irifune, T., Tsuchiya, J., Tange, Y., Nishihara, Y., Fujino, K., and Higo, Y. (2014) Stability of hydrous silicate at high pressures and water transport to the deep lower mantle. Nature Geoscience, 7, 224–227.10.1038/ngeo2074Search in Google Scholar

Nishi, M., Irifune, T., Gréaux, S., Tange, Y., and Higo, Y. (2015) Phase transitions of serpentine in the lower mantle. Physics of the Earth and Planetary Interiors, 245, 52–58.10.1016/j.pepi.2015.05.007Search in Google Scholar

Nishi, M., Tsuchiya, J., Arimoto, T., Kakizawa, S., Kunimoto, T., Tange, Y., Higo, Y., and Irifune, T. (2018) Thermal equation of state of MgSiO4H2 phase H determined by in situ X‑ray diffraction and a multianvil apparatus. Physics and Chemistry of Minerals, 45, 995–1001.10.1007/s00269-018-0980-zSearch in Google Scholar

Nishihara, Y., and Matsukage, K.N. (2016) Iron-titanium oxyhydroxides as water carriers in the Earth’s deep mantle. American Mineralogist, 101, 919–927.10.2138/am-2016-5517Search in Google Scholar

Ohira, I., Ohtani, E., Sakai, T., Miyahara, M., Hirao, N., Ohishi, Y., and Nishijima, M. (2014) Stability of a hydrous d-phase, AlOOH-MgSiO2(OH)2 and a mechanism for water transport into the base of lower mantle. Earth and Planetary Science Letters, 401, 12–17.10.1016/j.epsl.2014.05.059Search in Google Scholar

Ohishi, Y., Hirao, N., Sata, N., Hirose, K., and Takata, M. (2008) Highly intense monochromatic X‑ray diffraction facility for high-pressure research at SPring-8. High Pressure Research, 28, 163–173.10.1080/08957950802208910Search in Google Scholar

Ohtani, E. (2005) Water in the mantle. Elements, 1, 25–30.10.2113/gselements.1.1.25Search in Google Scholar

Ohtani, E. (2015) Hydrous minerals and the storage of water in the deep mantle. Chemical Geology, 418, 6–15.10.1016/j.chemgeo.2015.05.005Search in Google Scholar

Ohtani, E., Litasov, K., Suzuki, A., and Kondo, T. (2001) Stability field of new hydrous phase, δ-AIOOH, with implications for water transport into the deep mantle. Geophysical Research Letters, 28, 3991–3994.10.1029/2001GL013397Search in Google Scholar

Ohtani, E., Amaike, Y., Kamada, S., Ohira, I., and Mashino, I. (2016) Stability of hydrous minerals and water reservoirs in the deep Earth interior. In H. Terasaki and R.A. Fischer, Eds., Deep Earth: Physics and chemistry of the lower mantle and core. Geophysical Monograph, 217, p. 265–275. American Geophysical Union.10.1002/9781118992487.ch21Search in Google Scholar

Okamoto, K., and Maruyama, S. (2004) The eclogite–garnetite transformation in the MORB + H2O system. Physics of the Earth and Planetary Interiors, 146, 283–296.10.1016/j.pepi.2003.07.029Search in Google Scholar

Otte, K., Pentcheva, R., Schmahl, W.W., and Rustad, J.R. (2009) Pressure-induced structural and electronic transitions in FeOOH from first principles. Physical Review B, 80, 205116.10.1103/PhysRevB.80.205116Search in Google Scholar

Pamato, M.G., Myhill, R., Boffa Ballaran, T., Frost, D.J., Heidelbach, F., and Miyajima, N. (2015) Lower-mantle water reservoir implied by the extreme stability of a hydrous aluminosilicate. Nature Geoscience, 8, 75–79.10.1038/ngeo2306Search in Google Scholar

Panero, W.R., and Caracas, R. (2017) Stability of phase H in the MgSiO4H2– AlOOH–SiO2 system. Earth and Planetary Science Letters, 463, 171–177.10.1016/j.epsl.2017.01.033Search in Google Scholar

Panero, W.R., and Stixrude, L.P. (2004) Hydrogen incorporation in stishovite at high pressure and symmetric hydrogen bonding in d-AlOOH. Earth and Planetary Science Letters, 221, 421–431.10.1016/S0012-821X(04)00100-1Search in Google Scholar

Pearson, D.G., Brenker, F.E., Nestola, F., McNeill, J., Nasdala, L., Hutchison, M.T., Matveev, S., Mather, K., Silversmit, G., Schmitz, S., Vekemans, B., and Vincze, L. (2014) Hydrous mantle transition zone indicated by ringwoodite included within diamond. Nature, 507, 221–224.10.1038/nature13080Search in Google Scholar

Pernet, M., Joubert, J.C., and Berthet-Colominas, C. (1975) Etude par diffraction neutronique de la forme haute pression de FeOOH. Solid State Communications, 17, 1505–1510.10.1016/0038-1098(75)90983-7Search in Google Scholar

Pillai, S.B., Jha, P.K., Padmalal, A., Maurya, D.M., and Chamyal, L.S. (2018) First principles study of hydrogen bond symmetrization in d-AlOOH. Journal of Applied Physics, 123, 115901.10.1063/1.5019586Search in Google Scholar

Sano, A., Ohtani, E., Kubo, T., and Funakoshi, K-i. (2004) In situ X‑ray observation of decomposition of hydrous aluminum silicate AlSiO3OH and aluminum oxide hydroxide d-AlOOH at high pressure and temperature. Journal of Physics and Chemistry of Solids, 65, 1547–1554.10.1016/j.jpcs.2003.12.015Search in Google Scholar

Sano, A., Ohtani, E., Kondo, T., Hirao, N., Sakai, T., Sata, N., Ohishi, Y., and Kikegawa, T. (2008) Aluminous hydrous mineral d-AlOOH as a carrier of hydrogen into the core-mantle boundary. Geophysical Research Letters, 35, L03303.Search in Google Scholar

Sano-Furukawa, A., Komatsu, K., Vanpeteghem, C.B., and Ohtani, E. (2008) Neutron diffraction study of δ-AlOOD at high pressure and its implication for symmetrization of the hydrogen bond. American Mineralogist, 93, 1558–1567.10.2138/am.2008.2849Search in Google Scholar

Sano-Furukawa, A., Kagi, H., Nagai, T., Nakano, S., Fukura, S., Ushijima, D., Iizuka, R., Ohtani, E., and Yagi, T. (2009) Change in compressibility of d-AlOOH and δ-AlOOD at high pressure: A study of isotope effect and hydrogen-bond symmetrization. American Mineralogist, 94, 1255–1261.10.2138/am.2009.3109Search in Google Scholar

Sano-Furukawa, A., Hattori, T., Komatsu, K., Kagi, H., Nagai, T., Molaison, J.J., dos Santos, A.M., and Tulk, C.A. (2018) Direct observation of symmetrization of hydrogen bond in d-AlOOH under mantle conditions using neutron diffraction. Scientific Reports, 8, 15520.10.1038/s41598-018-33598-2Search in Google Scholar PubMed PubMed Central

Seto, Y., Nishio-Hamane, D., Nagai, T., and Sata, N. (2010) Development of a software suite on X‑ray diffraction experiments. The Review of High Pressure Science and Technology, 20, 269–276 (in Japanese).10.4131/jshpreview.20.269Search in Google Scholar

Smyth, J.R., and Jacobsen, S.D. (2006) Nominally anhydrous minerals and Earth’s deep water cycle. In S.D. Jacobsen and S. van der Lee, Eds., Earth’s Deep Water Cycle, Geophysical Monograph Series, 168, p. 1–11. American Geophysical Union.10.1029/168GM02Search in Google Scholar

Solomatova, N.V., Jackson, J.M., Sturhahn, W., Wicks, J.K., Zhao, J., Toellner, T.S., Kalkan, B., and Steinhardt, W.M. (2016) Equation of state and spin crossover of (Mg,Fe)O at high pressure, with implications for explaining topographic relief at the core-mantle boundary. American Mineralogist, 101, 1084–1093.10.2138/am-2016-5510Search in Google Scholar

Solomatova, N.V., Jackson, J.M., Sturhahn, W., Rossman, G.R., and Roskosz, M. (2017) Electronic environments of ferrous iron in rhyolitic and basaltic glasses at high pressure. Journal of Geophysical Research: Solid Earth, 122, 6306–6322.10.1002/2017JB014363Search in Google Scholar

Sturhahn, W. (2000) CONUSS and PHOENIX: Evaluation of nuclear resonant scattering data. Hyperfine Interactions, 125, 149–172.10.1023/A:1012681503686Search in Google Scholar

Sturhahn, W. (2016) CONUSS (COherent NUclear resonant Scattering by Single crystals). Open source software, http://www.nrixs.com10.1016/B978-0-12-803581-8.01223-6Search in Google Scholar

Sturhahn, W. (2018) MINUTI (MINeral physics UTIlities). Open source software, http://www.nrixs.comSearch in Google Scholar

Suzuki, A. (2009) Compressibility of the high-pressure polymorph of AlOOH to 17 GPa. Mineralogical Magazine, 73, 479–485.10.1180/minmag.2009.073.3.479Search in Google Scholar

Suzuki, A. (2010) High-pressure X‑ray diffraction study of e-FeOOH. Physics and Chemistry of Minerals, 37, 153–157.10.1007/s00269-009-0319-xSearch in Google Scholar

Suzuki, A. (2016) Pressure–volume–temperature equation of state of e-FeOOH to 11 GPa and 700 K. Journal of Mineralogical and petrological Science, 111, 420–424.10.2465/jmps.160719cSearch in Google Scholar

Suzuki, A., Ohtani, E., and Kamada, T. (2000) A new hydrous phase d-AlOOH synthesized at 21 GPa and 1000 °C. Physics and Chemistry of Minerals, 27, 689–693.10.1007/s002690000120Search in Google Scholar

Tackley, P.J. (2011) Living dead slabs in 3-D: The dynamics of compositionally-stratified slabs entering a ‘‘slab graveyard” above the core-mantle boundary. Physics of the Earth and Planetary Interiors, 188, 150–162.10.1016/j.pepi.2011.04.013Search in Google Scholar

Takemura, K., Sahu, P.Ch., Kunii, Y., and Toma, Y. (2001) Versatile gas-loading system for diamond-anvil cells. Review of Scientific Instruments, 72, 3873–3876.10.1063/1.1396667Search in Google Scholar

Thompson, E.C., Campbell, A.J., and Tsuchiya, J. (2017) Elasticity of e-FeOOH: Seismic implications for Earth’s lower mantle. Journal of Geophysical Research: Soild Earth, 122, 5038–5047.10.1002/2017JB014168Search in Google Scholar

Toellner, T.S. (2000) Monochromatization of synchrotron radiation for nuclear resonant scattering experiments. Hyperfine Interactions, 125, 3–28.10.1023/A:1012621317798Search in Google Scholar

Tschauner, O., Huang, S., Greenberg, E., Prakapenka, V.B., Ma, C., Rossman, G.R., Shen, A.H., Zhang, D., Newville, M., Lanzirotti, A., and Tait, K. (2018) Ice-VII inclusions in diamonds: Evidence for aqueous fluid in Earth’s deep mantle. Science, 359, 1136–1139.10.1126/science.aao3030Search in Google Scholar PubMed

Tsuchiya, J., and Mookherjee, M. (2015) Crystal structure, equation of state, and elasticity of phase H (MgSiO4H2 at Earth’s lower mantle pressures. Scientific Reports, 5, 15534.10.1038/srep15534Search in Google Scholar PubMed PubMed Central

Tsuchiya, J., and Tsuchiya, T. (2009) Elastic properties of d-AlOOH under pressure: First principles investigation. Physics of the Earth and Planetary Interiors, 174, 122–127.10.1016/j.pepi.2009.01.008Search in Google Scholar

Tsuchiya, J., Tsuchiya, T., Tsuneyuki, S., and Yamanaka, T. (2002) First principles calculation of a high-pressure hydrous phase, d-AlOOH. Geophysical Research Letters, 29, 1909.10.1029/2002GL015417Search in Google Scholar

van der Meer, D.G., Spakman, W., van Hinsbergen, D.J.J., Amaru, M.L., and Torsvik, T.H. (2010) Towards absolute plate motions constrained by lower-mantle slab remnants. Nature Geoscience, 3, 36–40.10.1038/ngeo708Search in Google Scholar

Vanpeteghem, C.B., Ohtani, E., and Kondo, T. (2002) Equation of state of the hydrous phase d-AlOOH at room temperature up to 22.5 GPa. Geophysical Research Letters, 29, 1119.10.1029/2001GL014224Search in Google Scholar

Walter, M.J., Thomson, A.R., Wang, W., Lord, O.T., Ross, J., McMahon, S.C., Baron, M.A., Melekhova, E., Kleppe, A.K., and Kohn, S.C. (2015) The stability of hydrous silicates in Earth’s lower mantle: Experimental constraints from the systems MgO–SiO2–H2O and MgO–Al2O3–SiO2–H2O. Chemical Geology, 418, 16–29.10.1016/j.chemgeo.2015.05.001Search in Google Scholar

Wirth, R., Vollmer, C., Brenker, F., Matsyuk, S., and Kaminsky, F. (2007) Inclusions of nanocrystalline hydrous aluminium silicate “Phase Egg” in superdeep diamonds from Juina (Mato Grosso State, Brazil). Earth and Planetary Science Letters, 259, 384–399.10.1016/j.epsl.2007.04.041Search in Google Scholar

Wu, Y., Wu, X., Lin, J.-F., McCammon, C.A., Xiao, Y., Chow, P., Prakapenka, V.B., Yoshino, T., Zhai, S., and Qin, S. (2016) Spin transition of ferric iron in the NAL phase: Implications for the seismic heterogeneities of subducted slabs in the lower mantle. Earth and Planetary Science Letters, 434, 91–100.10.1016/j.epsl.2015.11.011Search in Google Scholar

Xue, X., and Kanzaki, M. (2007) High-pressure d-Al(OH)3 and d-AlOOH phases and isostructural hydroxides/oxyhydroxides: New structural insights from high-resolution 1H and 27Al NMR. The Journal of physical Chemistry B, 111, 13,156–13,166.10.1021/jp073968rSearch in Google Scholar PubMed

Received: 2018-11-30
Accepted: 2019-05-13
Published Online: 2019-08-28
Published in Print: 2019-09-25

© 2019 Walter de Gruyter GmbH, Berlin/Boston

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