Journal ArticleDOI
Polymorphic phase transition in Superhydrous Phase B
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In this article, the authors synthesized superhydrous phase B (shy-B) at 22 GPa and two different temperatures: 1200°C (LT) and 1400°C(HT) using a multi-anvil apparatus.Abstract:
We synthesized superhydrous phase B (shy-B) at 22 GPa and two different temperatures: 1200°C (LT) and 1400°C (HT) using a multi-anvil apparatus. The samples were investigated by transmission electron microscopy (TEM), single crystal X-ray diffraction, Raman and IR spectroscopy. The IR spectra were collected on polycrystalline thin-films and single crystals using synchrotron radiation, as well as a conventional IR source at ambient conditions and in situ at various pressures (up to 15 GPa) and temperatures (down to −180°C). Our studies show that shy-B exists in two polymorphic forms. As expected from crystal chemistry, the LT polymorph crystallizes in a lower symmetry space group (Pnn2), whereas the HT polymorph assumes a higher symmetry space group (Pnnm). TEM shows that both modifications consist of nearly perfect crystals with almost no lattice defects or inclusions of additional phases. IR spectra taken on polycrystalline thin films exhibit just one symmetric OH band and 29 lattice modes for the HT polymorph in contrast to two intense but asymmetric OH stretching bands and at least 48 lattice modes for the LT sample. The IR spectra differ not only in the number of bands, but also in the response of the bands to changes in pressure. The pressure derivatives for the IR bands are higher for the HT polymorph indicating that the high symmetry form is more compressible than the low symmetry form. Polarized, low-temperature single-crystal IR spectra indicate that in the LT-polymorph extensive ordering occurs not only at the Mg sites but also at the hydrogen sites.read more
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Journal ArticleDOI
Proton Distributions and Hydrogen Bonding in Crystalline and Glassy Hydrous Silicates and Related Inorganic Materials: Insights from High-Resolution Solid-State Nuclear Magnetic Resonance Spectroscopy
Xianyu Xue,Masami Kanzaki +1 more
TL;DR: In this paper, the authors present updated correlations between 1 H chemical shift and O ··· O and H ··· o distances of O-H · − O hydrogen bonds, derived from a comprehensive 1H chemical shift database containing both original high-quality fast magic angle spinning (MAS) and two-dimensional combined rotation and multiple pulse spectroscopy (CRAMPS)-MAS NMR data and literature MAS NMRI data for a large number of inorganic compounds, including phosphates, silicates, (oxy)hydroxides, borates, sulfates, and
Journal ArticleDOI
Hydrogen in High Pressure Silicate and Oxide Mineral Structures
TL;DR: In addition to the surface processes, water also controls the processes of the interior of the Earth as mentioned in this paper, and the amount of water in the Earth's interior is a significant fraction of the total water budget of the planet.
Journal ArticleDOI
Water Concentration in Single-Crystal (Al,Fe)-Bearing Bridgmanite Grown From the Hydrous Melt: Implications for Dehydration Melting at the Topmost Lower Mantle
Suyu Fu,Jing Yang,Jing Yang,Shun-ichiro Karato,Alexander L. Vasiliev,Alexander L. Vasiliev,Alexander L. Vasiliev,Mikhail Yu. Presniakov,Alexander G. Gavriliuk,Alexander G. Gavriliuk,Anna G. Ivanova,Erik H. Hauri,Takuo Okuchi,Narangoo Purevjav,Jung-Fu Lin +14 more
TL;DR: In this paper, high-quality single-crystals of bridgmanite, Mg0.88 Fe0.065Fe0.035Al0.14Si0.90O3, of hundreds of micrometer size were synthesized at 24 GPa and 1800 °C in a Kawai-type apparatus from the starting hydrous melt containing 6.7 wt% water.
Journal ArticleDOI
SR-FTIR Microscopy and FTIR Imaging in the Earth Sciences
Giancarlo Della Ventura,Giancarlo Della Ventura,Augusto Marcelli,Fabio Bellatreccia,Fabio Bellatreccia +4 more
TL;DR: In the early 20th century, the first contribution of the first issue of Physical Review, one of the most important physical magazines, published in 1883, was devoted to "a study of the transmission spectra of certain substances in the infrared" that included also a plate of a quartz rock crystal (Nichols 1883) and the very first database of IR spectra where the characteristic wavelength at which various materials absorbed the IR radiation were listed.
Journal ArticleDOI
Thermal equation of state of superhydrous phase B to 27 GPa and 1373 K
TL;DR: In this article, Anderson et al. measured superhydrous phase B (Mg 10 Si 3 O 14 (OH) 4 ) using synchrotron X-ray diffraction with a multi-anvil apparatus at the SPring-8 facility.
References
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Calibration of the ruby pressure gauge to 800 kbar under quasi-hydrostatic conditions
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Mineralogy of the Martian interior up to core‐mantle boundary pressures
Constance M. Bertka,Yingwei Fei +1 more
TL;DR: In this paper, a multianvil experiment with a model of the Martian mantle composition up to 23.5 GPa was performed to determine the mineralogy of the Mars interior along a high-temperature areotherm.
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Phase relations in the transition zone
TL;DR: In this article, a temperature-pressure phase diagram for the system CaO-MgO-Al2O3-SiO2 (CMAS) in the pressure range 0-280 kbar is presented.