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Journal Articles

Pressure effect on isotope fractionation factor

Sano, Asami; Ito, Shoichi*; Suzumura, Akimasa*; Ueno, Yuichiro*; Yagi, Hikaru*; Inoue, Toru*; Kawazoe, Takaaki*

Koatsuryoku No Kagaku To Gijutsu, 30(2), p.85 - 94, 2020/10

https://doi.org/10.4131/jshpreview.30.85

Minerals and rocks exhibit various isotope compositions depending on their origins and histories. In interpreting their isotopic variations, the equilibrium isotope fractionation factor is a key because it depends on the environment parameters such as temperature. Recent studies have shown that the effect of pressure on the isotope fractionation, which was considered negligible compared to temperature, is significant under the conditions of the Earth's interior. In this article we review recent advances in experimental studies to determine the isotope fractionation of iron and hydrogen at high pressure over several GPa, discussing their issues and future perspectives.

Journal Articles

Neutron diffraction measurements of the structure of an orthosilicate glass: Mg$$_{2}$$SiO$$_{4}$$

Weber, J. K. R.*; Tangeman, J. A.*; Key, T. S.*; Loong, C.-K.*; Takeuchi, Ken*; Suzuya, Kentaro

Physics and Chemistry of Glasses, Vol.43C 2002, p.68 - 70, 2002/00

The structure of olivine-composition glasses is of considerable interest in both geology and glass-science. Olivine is one of the most common minerals in the Earth's upper mantle, and properties of olivine-rich melts are relevant to a variety of petrologic problems. Despite their prevalence and novelty, such glasses has not been studied thoroughly due to difficulties associated with their synthesis. Recently, Weber et al successfully prepared bulk olivine glass with the forsterite-composition Mg$$_{2}$$SiO$$_{4}$$ using a containerless technique and initiated a neutron-diffraction investigation of the short-range structure of the glass. In this study, we present a result of the pulsed neutron diffraction experiment on the forsterite-composition glass. The neutron diffraction analysis suggests that highly distorted MgO$$_{n}$$ polyhedra are the major networking structural units in the forsterite-composition glass.

Journal Articles

${it In situ}$ observation of ilmenite-perovskite phase transition in MgSiO$$_{3}$$ using synchrotron radiation

Ono, Shigeaki*; Katsura, Tomoo*; Ito, Eiji*; Kanzaki, Masami*; Yoneda, Akira*; Walter, M.*; Urakawa, Satoru*; Utsumi, Wataru; Funakoshi, Kenichi*

Geophysical Research Letters, 28(5), p.835 - 838, 2001/03

https://doi.org/10.1029/1999GL008446
 Times Cited Count：79 Percentile：86.14(Geosciences, Multidisciplinary)

no abstracts in English

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