...Hitoshi Gomi; Yingwei Fei; Takashi Yoshino Abstract Hydrogen has been considered as an important candidate of light elements in the Earth's core. Because iron hydrides are unquenchable, hydrogen content is usually estimated from in situ X-ray diffraction measurements that assume the following...

... or hydrogen may be transported as far as the bottom of the lower mantle by reacting with metallic iron in the lower mantle to form hydrous phases or iron hydride. Superhydrous phase B decomposes to Mg-perovskite, periclase, and fluid at 30 GPa and above 1200°C; however, it decomposes into hydrous phase D...

... to generate high P-T conditions. Diamond anvils with 300 or 120 μm diameter culets were used, and gaskets were pre-indented rhenium plates. We used two different methods to supply hydrogen to the iron foil starting material (99.99% purity). In runs 1–3, iron hydride was formed by loading an iron foil...

... Copyright © 2023 by the Mineralogical Society of America 2023 Mineralogical Society of America Hydrogen iron hydride spin transition volume expansion Earth’s core Physics and Chemistry of Earth’s Deep Mantle and Core The Earth’s core comprises an iron-nickel alloy with some additional...

... of ( a ) face-centered cubic (fcc) MH x (D x ) and ( b ) hexagonal close-packed (hcp) MH x . Large gray spheres indicate metal atoms. Small spheres indicate O sites and T sites occupied by hydrogen atoms. The figures were produced using VESTA ( Momma and Izumi 2011 ). (Color online.) Iron hydride...

.... , Hemley , R.J. , and Mao , H.K. ( 1991 ) High-pressure chemistry of hydrogen in metals: In situ study of iron hydride . Science , 253 , 421 – 424 , https://doi.org/10.1126/science.253.5018.421 . Blanco , M.A. , Francisco , E. , and Luana , V. ( 2004 ) GIBBS: Isothermal...

...Figure 10. Melting curves of iron ( Shen et al. 1998 ; solid line), iron hydride ( Hiroi et al. 2005 ; solid line), and ferrosilite ( Kato et al. 1984 ; solid line and solid squares). The curve of decomposition of fayalite in a hydrogen atmosphere ( Efimchenko et al. 2019 ; solid line...

..., J.M., Dornheim, M., Klassen, T., and Bormann, R. ( 2008 ) Thermal and mechanically activated decomposition of LiAlH 4 . Materials Research Bulletin , 43 , 1263 –1275. Badding, J.V., Hemley, R.J., and Mao, H.K. ( 1991 ) High-pressure chemistry of hydrogen in metals: In situ study of iron hydride...

... of lattice vibrations on the relative stability of different crystalline phases is provided by iron and palladium hydrides, FeH and PdH. FeH was synthesized by different experimental groups ( Antonov et al. 1980 ; Badding et al. 1992 ; Hirao et al. 2004 ) and its crystalline structure was found...

... 11 040 Reagents * Rosman & Taylor (1998) All isotope signals, except 80 Se, are recorded as the additional data serve as indicators of the state of hydride generation and plasma conditions. Iron and Cu in the dissolved precipitates and column washes are measured at a medium...

.... Geochimica et Cosmochimica Acta , 53 , 197 – 214 . Badding , J. , Hemley , R. , and Mao , H. ( 1991 ) High-pressure chemistry of hydrogen in metals: In situ study of iron hydride . Science , 253 , 421 – 424 . Batalha , N.M. , Borucki , W.J. , Bryson , S.T...

... with a strong anion exchange column (Hamilton PRP-X 100 SAX, 250 × 4.6 mm, 10 μm), and guard column. A 10 m m K 2 HPO 4 /KH 2 PO 4 mobile phase at pH 5.75 was used, with a flow rate of 1 ml min −1 . The column was coupled to a PS Analytical 10.055 Millennium Excalibur Hydride Generation-Atomic Fluorescence...

...-earth problems is iron hydride ( Badding et al. 1991 , Yagi and Hishinuma 1995 , Okuchi 1997 , 1998 ). Near stoichiometric FeH was produced in a diamond anvil cell experiment by Badding (1991) , and has a double hexagonal closepacked structure with a unit cell volume up to 17% larger than pure iron...

... such as iron, which are found in higher concentrations in environmental samples ( Chen et al. 1992 ). In any case, due to its superior advantage, hydride generation is the most popular sample derivatization method used for inorganic arsenic detection in water samples ( Hung et al. 2004 ). By varying...

... evolution of seawater inferred from Precambrian Iron Formations . Goldschmidt 2012 Conference , June 24–29, 2012 , Montréal, Canada Layton-Matthews D Leybourne MI Peter JM Scott SD ( 2006 ) Determination of selenium isotopic ratios by continuous-hydride generation dynamic-reaction...

... uncertain. Hydrogen has profound effects on properties and processes on microscopic-to-global scales. Here we report the discovery of the first hydride (VH 2 ) ever reported in nature. This phase has been found in the ejecta of Cretaceous pyroclastic volcanoes on Mt Carmel, N. Israel, which include abundant...

...John L. Walshe; James S. Cleverley Deposits classified as epithermal gold-silver deposits, copper-gold porphyry deposits, gold skarn deposits, iron oxide-copper-gold deposits and intrusion-related Au deposits show some spatial ± temporal affinity with intrusive magmatic activity, commonly...

... 2 resource that is measured, while H 2 is continuously being generated in these settings. Besides the above, large quantities of primordial H 2 are available in the earth’s mantle and core where it is in combination with metals like Fe and Ni as metal hydrides. This resource has also been...