Dyah Sulistyanintyas

Automatic sample changer for IBARAKI materials design diffractometer (iMATERIA)

IBARAKI Materials Design Diffractometer (iMATERIA) is a high-throughput powder diffractometer. iMATERIA has a vacuum chamber, which is enclosed in a shield. Each sample is measured in 10 minutes, and must be placed in the vacuum chamber before being measured. If the vacuum in the chamber cannot be maintained while exchanging samples, the process of re-establishing the vacuum would become a bottleneck when samples are exchanged. To reduce exchange time, we developed and manufactured an automatic sample changer that can handle a large number of samples (up to 672) through both the vacuum chamber and shielding blocks.

Neutron Powder Diffraction Study of Protonic Conductor K3H(SeO4)2

Crystal structures of protonic conductor K 3 H(SeO 4 ) 2 in the phase I (conducting phase) and phase II (room-temperature phase) have been determined using a time-of-flight (TOF) neutron diffractometer VEGA. SeO 4 tetrahedra in the phase I were rotationally displaced with the occupancy 1/3 and the crystal structure in the phase II was remain locally. Proton distribution maps were obtained from the maximum entropy method (MEM) describe that the amount of the proton in a hydrogen bond were decline from 87.3% to 21.4% with increasing the temperature and 13.4% of protons exist at inter-layer space. Incoherent quasi-elastic neutron scattering (QENS) experiments performed by LAM80-ET spectrometer yield the QENS spectra of conducting protons. Proton diffusion constants are estimated as 1.9(1) × 10 − 10 m 2 /s at 393 K and 2.1(3) × 10 − 10 m 2 /s at 413 K, respectively.

Development of a new special environment powder neutron diffractomter, SPICA

1 High Energy Accelerator Research Organization (KEK), Institute of Materials Structure Science, Ibaraki, Japan, 2 Kyoto University, Research Reactor Institute, Osaka, Japan, 3 Tokyo University of Science, Faculty of Science & Technology, Chiba, Japan, 4 Tokyo Institute of Technology, Department of Electronic Chemistry, Yokohama, Japan, 5 Kyoto Univiersity, Office of Society-Academia Collaboration for Innovation, Kyoto, Japan, 6 Kyoto University, Graduate School of Human and Environmental Studies, Kyoto, Japan