https://orcid.org/0000-0003-3215-3995
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ABSTRACT
Single-crystal neutron diffraction provides direct information about crystal structures such as hydrogen positions and magnetic structures. However, in-situ experiments conducted under high pressure entail technical difficulties such as attenuation correction, masking of parasitic diffraction, and limitations of sample volumes and accessible directions. For this study, we improved diamond anvil cells with a tubular frame made of Zr-based bulk metallic glass and nano-polycrystalline diamond anvils for single-crystal neutron diffraction. The thicker tubular frame was confirmed through experimentation as stably generating 4.5 GPa. Its feasibility for neutron diffraction was assessed at the Laue-TOF diffractometer at the BL18 (SENJU) beamline in the MLF J-PARC using time-resolved two-dimensional detectors covering wide solid angles. In addition to ambient-pressure measurements of NH4Cl, diffraction patterns of a high-pressure phase of ice were also collected in-situ. The obtained intensities are of refinable quality sufficient for structure analysis.
Acknowledgements
Neutron diffraction experiments were performed at the BL18 (SENJU) beamline through the J-PARC user programmes (No. 2020B0156). Sample preparation including ruby fluorescent measurements was performed using apparatuses at the BL11 (PLANET) at the MLF J-PARC. The NPDs used for this study were supplied by the Joint Usage/Research Centre PRIUS, Ehime University, Japan. This work was performed under the GIMRT programme of the Institute for Materials Research, Tohoku University (Proposal No. 20K0085).
Disclosure statement
No potential conflict of interest was reported by the author(s).