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Kazutaka Ikeda

Kazutaka Ikeda

High Energy Accelerator Research Organization (KEK), Japan

Title: In-situ scattering experiment and structural analysis of hydrogen storage materials by high intensity neutron total diffractometer (nova)

Biography

Biography: Kazutaka Ikeda

Abstract

A high intensity neutron total diffractometer, NOVA, at J-PARC realizes new opportunity to study atomicdistribution in various materials. Short timeand small sample measurements are feasible for averaged structure analysis, and the realspace resolution is enough for local structure (Pair Distribution Function) analysis.Crystalline structure as well as amorphous and liquid structure was investigated by NOVA for AlD3, LaDx and LiAl(ND2)4. Also, time-transient measurement during hydrogen absorption and desorption process under hydrogen/deuterium gas atmosphere (max 10 MPa) is performed on NOVA, using a tight cell made from single crystal sapphire. The diffraction profiles of powder samples in the tight cell are obtained by removing the Bragg peaks of the single crystal sapphire. Absorption was carried out by submitting Pd powder to a deuterium pressure of 2 MPa at 393 K and letting it absorb with its own kinetics in quasi-equilibrium conditions. The time-divided neutron diffraction profiles during the deuterium absorption reaction revealed that the phase continuously transforms from metal Pd through alpha-PdDx to beta-PdD~0.7 in a few seconds.Some of recent results for structural study of promising hydrogen storage materials on NOVA will be presented. This work was partially supported by the New Energy and Industrial Technology Development Organization (NEDO) under “Advanced Fundamental Research Project on Hydrogen Storage Materials (HydroStar)” and “Feasibility Study on Advanced Hydrogen Storage Materials for Automotive Applications (2012)”, JSPS KAKENHI Grant Numbers 23686101, 24241034, 15K13810 and the Neutron Scattering Program Advisory Committee of IMSS, KEK (Proposal No. 2009S06, 2014S06).