Kosuke Kurushima

Low‐Temperature Solid‐Phase Synthesis of Graphene Thin Films Usable in the Harsh Environment of Liquids

Vikaskumar Pradeepkumar Gupta, Muzzammil Ngatiman, Nur Sahiera Binti Abd Rohim, Naoko Yoshida et autres

ABSTRACT The synthesis of graphene at lower temperatures remains challenging, along with the expansion of its application areas. Here we demonstrated the graphene synthesis on various substrates at and above 350°C by a solid phase reaction method. In this method, C‐rich Ni–C …

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Relationship between Pb ion off-centering and lone pair electrons

Kosuke Kurushima, Hiroshi Nakajima, Takahiro Ogata, Yuki Sakai et autres

Abstract High-pressure synthesized Pb-based perovskites exhibit diverse functional properties. PbCrO 3 , for instance, displays distinctive diffuse scattering and valence skipping, forming Pb 2+ and Pb 4+ ions. However, the spatial distribution of Pb ions in the crystal remains largely unexplored. Here, …

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Formation of Lateral-Type High-Tc Superconductor Josephson Junction by Helium Ion Microscopy

Shinichi Ogawa, Tetsuro Misawa, Kosuke Kurushima, Yuji Otsuka et autres

This paper presents, for the first time, the results of investigating the dependence of ion dose and temperature on the formation of Josephson junctions via helium ion irradiation of YBa2Cu3O7-δ high-temperature superconductor thin films. Helium ion microscopy technology was employed for the …

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Translational Symmetry Breaking at Charged Domain Walls in a Layered Perovskite Ferroelectric

Hiroshi Nakajima, Kosuke Kurushima, Hirofumi Tsukasaki, Shigeo Mori

Ferroelectrics are known as important functional materials that play various roles in electronics, various sensors, and energy harvesting applications. The functional properties depend largely on the polarization reversal caused by the movement of the boundary between domains with different polarization directions within …

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Nanoscale coexistence of polar-nonpolar domains underlying oxygen storage properties in Ho(Mn,Ti)O3+δ

Hiroshi Nakajima, Kento Uchihashi, Hirofumi Tsukasaki, Daisuke Morikawa et autres

Hexagonal manganese oxides $R\mathrm{Mn}{\mathrm{O}}_{3}$ ($R=\mathrm{Y}$, Ho--Lu, Sc, and In) show intriguing topological ferroelectric domain walls with variable conductivity, leading to domain wall engineering. Despite the numerous experimental studies on these polar nanoscale structures, controlling ferroelectric domains has not been sufficiently investigated. Here, …

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Nanoscale coexistence of polar-nonpolar domains underlying oxygen storage properties in Ho(Mn, Ti)O_3+δ

Hiroshi Nakajima, Kento Uchihashi, Hirofumi Tsukasaki, Daisuke Morikawa et autres

Hexagonal manganese oxides RMnO 3 (R = Y, Ho-Lu, Sc, and In) show intriguing topological ferroelectric domain walls with variable conductivity, leading to domain wall engineering.Despite the numerous experimental studies on these polar nanoscale structures, controlling ferroelectric domains has not been sufficiently …

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Wavy Graphene-Like Network Forming during Pyrolysis of Polyacrylonitrile into Carbon Fiber

Toru Ishikawa, Fumihiko Tanaka, Kosuke Kurushima, Akira Yasuhara et autres

Carbon fiber (CF) obtained by pyrolysis of polyacrylonitrile (PAN-CF) surpasses metals in properties suitable for diverse applications such as aircraft manufacture and power turbine blades. PAN-CF obtained by pyrolysis at 1200-1400 °C shows a remarkably high tensile strength of 7 GPa, much …

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Polar–Nonpolar Transition-Type Negative Thermal Expansion with 11.1% Volume Shrinkage by Design

Takumi Nishikubo, Takashi Imai, Yuki Sakai, Masaichiro Mizumaki et autres

Chemical substitution for the tuning of the working temperature of phase-transition-type negative thermal expansion (NTE) materials generally reduces the volume shrinkage during the transition. We have investigated the effects of electron doping and reduction of 6s 2 lone-pair activity in PbVO 3 …

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Structural Analysis of a Ferroelectric Material Using Atomic-Resolution Electron Microscopy with Elemental Mapping

Hiroshi Nakajima, Shigeo Mori, Kosuke Kurushima

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Immense Reduction in Interfacial Resistance between Sulfide Electrolyte and Positive Electrode

Kazunori Nishio, Daisuke Imazeki, Kosuke Kurushima, Yuki Takeda et autres

Low interfacial resistance between the solid sulfide electrolyte and the electrode is critical for developing all-solid-state Li batteries; however, the origin of interfacial resistance has not been quantitatively reported in the literature. This study reports the resistance values across the interface between …

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CSD 2165970: Experimental Crystal Structure Determination

Chengchao Zhong, Yui Ishii, Cédric Tassel, Tong Zhu et autres

An entry from the Inorganic Crystal Structure Database, the world’s repository for inorganic crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the joint CCDC and FIZ Karlsruhe Access …

CSD 2175957: Experimental Crystal Structure Determination

Chengchao Zhong, Yui Ishii, Cédric Tassel, Tong Zhu et autres

An entry from the Inorganic Crystal Structure Database, the world’s repository for inorganic crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the joint CCDC and FIZ Karlsruhe Access …