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An opposed-anvil-type apparatus with an optical window and a wide-angle aperture for neutron diffraction |
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| Authors: | Riko Iizuka Takehiko Yagi Hirotada Gotou Kazuki Komatsu Hiroyuki Kagi |
| Institution: | 1. Institute for Solid State Physics, The University of Tokyo , Kashiwa , Japan;2. Geochemical Research Center, Graduate School of Science, The University of Tokyo , Tokyo , Japan riizuka@eqchem.s.u-tokyo.ac.jp;4. Geodynamics Research Center, Ehime University , Matsuyama , Japan;5. Institute for Solid State Physics, The University of Tokyo , Kashiwa , Japan;6. Geodynamics Research Center, Ehime University , Matsuyama , Japan |
| Abstract: | We designed new anvil assemblies for acquiring high-quality neutron diffraction data and ruby fluorescence spectra inside a sample chamber. The conical aperture of Ni-binded WC anvils was expanded by a factor of two. A hybrid gasket made of TiZr- and Al-alloy was developed to prevent outward extrusion. A small and optically transparent window of moissanite was introduced to allow for the determination of pressure and hydrostaticity by measurement of ruby fluorescence spectra. High pressure-generation tests that make use of Bi electrical conductivity and ruby pressure markers revealed that pressure could be determined over 10 GPa. In situ synchrotron X-ray diffraction experiments were also carried out using NaCl as the pressure calibrants. The maximum pressure achieved was approximately 13 GPa. The neutron diffraction intensity from the newly generated anvil assemblies was 2.5–3.0 times greater than that using the standard toroidal anvil assemblies used previously. |
| Keywords: | Paris–Edinburgh cell neutron diffraction ruby fluorescence optical window hydrogen bond |