Yuki Shibazaki

Recent application studies of an INTPIX4NA SOIPIX detector-based X-ray camera using an SiTCP-XG 10GbE-based high-speed readout system at KEK facilities

Ryutaro Nishimura, Noriyuki Igarashi, Daisuke Wakabayashi, Yuki Shibazaki et autres

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Reversible pressure-induced dehydration of NaBH 4 ·2H 2 O and the role of dihydrogen bonds: the investigation based on Raman scattering

Satoshi Nakano, Hiroshi Fujihisa, Hiroshi Yamawaki, Yuki Shibazaki et autres

High-pressure Raman scattering measurements on sodium borohydride dihydrate NaBH4·2H2O were performed up to 8.5 GPa to investigate the structural changes during dehydration and the transformation previously observed by X-ray diffraction. Density functional theory calculations were used to identify the Raman modes of …

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Crystal Structure of the High-Pressure Phase of Ca(BH 4 ) 2 and Further Structural Changes up to 70 GPa

Satoshi Nakano, Hiroshi Fujihisa, Hiroshi Yamawaki, Yuki Shibazaki et autres

To investigate the high-pressure structural changes of α-Ca(BH4)2, high-pressure X-ray diffraction and high-pressure Raman scattering were performed up to approximately 60 GPa. We found that α-Ca(BH4)2 as an ambient pressure phase (AP) underwent a pressure-induced phase transition at 2.0 GPa to a …

Physics-informed unsupervised machine learning for 4D-STEM materials characterization

Koji Kimoto, Ovidiu Cretu, Koji Harano, Fumihiko Uesugi et autres

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Nonnegative matrix factorization incorporating domain specific constraints for four dimensional scanning transmission electron microscopy

Koji Kimoto, Fumihiko Uesugi, Koji Harano, Jun Kikkawa et autres

Modern electron microscopy enables the acquisition of extremely large datasets, necessitating optimized machine learning techniques, such as dimensionality reduction and clustering, to extract material insights. We propose a novel nonnegative matrix factorization (NMF) technique that integrates domain-specific constraints inherent to electron microscopy, …

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Development of a new phase-retrieval algorithm from a single-shot image for X-ray schlieren microscopy

Ryutaro Nishimura, Yoshio Suzuki, Hiroshi Sugiyama, Daisuke Wakabayashi et autres

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Author Correction: Siliceous zeolite-derived topology of amorphous silica

Hirokazu Masai, Shinji Kohara, Toru Wakihara, Yuki Shibazaki et autres

In the version of the article initially published, in Fig. 3a, the label “Pristine SZ CVR=39% d =1.6 g cm –3 ” was incorrect and has now been amended to “Pristine SZ CVR=39% d =1.8 g cm –3 ”. Additionally, in the …

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Pressure-Induced Dehydration and Reversible Recrystallization of Dihydrogen-Bonded Sodium Borohydride Dihydrate NaBH4·2H2O

Satoshi Nakano, Hiroshi Fujihisa, Hiroshi Yamawaki, Yuki Shibazaki et autres

Sodium borohydride dihydrate (NaBH 4 ·2H 2 O) forms through dihydrogen bonding between the hydridic hydrogen of the BH 4 – ion and the protonic hydrogen of the water molecule. High-pressure structural changes in NaBH 4 ·2H 2 O, observed up to …

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Pressure-controlled luminescence in fast-response barium fluoride crystals

Marilou Cadatal‐Raduban, Mui Viet Luong, Masahiro Yamashita, Yuki Shibazaki et autres

Abstract Cross-luminescence (CL) in a barium fluoride (BaF2) scintillator arising from the recombination of a valence band electron and a core band hole results in a fast picosecond decay time. However, the CL emission wavelength in the vacuum ultraviolet region is difficult …

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Photoinduced Electronic Conduction in Silver Iodide under High Pressure

T. Kimura, Hiroki Kubota, Y. Okuda, Yuki Shibazaki et autres

The photoresponse of the electrical conductivity of the silver iodide (AgI) rock-salt phase was studied under high pressure through AC impedance spectroscopy. The resistance substantially decreased by 2 orders of magnitude when the AgI sample was irradiated using visible light at 2.4 …

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X-ray imaging camera using INTPIX4NA SOIPIX detector with SiTCP-XG 10GbE based high-speed readout system

Ryutaro Nishimura, Noriyuki Igarashi, Daisuke Wakabayashi, Yuki Shibazaki et autres

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Intersite Charge Transfer through Eu 4f Band Engineering in Eu1–xSrxVO2H Oxyhydride Films

Morito Namba, Hiroshi Takatsu, Kantaro Murayama, Yuki Shibazaki et autres

Perovskite oxyhydride EuVO 2 H exhibits a Mott insulating state derived from V III O 2 layers and a ferromagnetic state derived from Eu II H layers, with compressive strain inducing intersite charge transfer (ICT) in thin films, accompanied by an increased …

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