Search Results - "Yamamoto, Hajime"

Colossal Negative Thermal Expansion in Electron‐Doped PbVO3 Perovskites by Yamamoto, Hajime, Imai, Takashi, Sakai, Yuki, Azuma, Masaki

“…Colossal negative thermal expansion (NTE) with a volume contraction of about 8 %, the largest value reported so far for NTE materials, was observed in an…”
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Development of Bismuth Ferrite as a Piezoelectric and Multiferroic Material by Cobalt Substitution by Hojo, Hajime, Oka, Kengo, Shimizu, Keisuke, Yamamoto, Hajime, Kawabe, Ryo, Azuma, Masaki

“…Bismuth ferrite (BiFeO3) is the most widely studied multiferroic material with robust ferroelectricity and antiferromagnetic ordering at room temperature. One…”
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Compressive residual stress applied to a low-carbon steel surface alloyed with WC tool constituent elements according to friction stir processing by Yamamoto, Hajime, Yamamoto, Yuji, Ito, Kazuhiro, Mikami, Yoshiki

“…[Display omitted] •FSPed steel surfaces are alloyed with WC tool constituent elements and strengthened via solid solution and grain refinement…”
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Cation Dimerization in a 3d1 Honeycomb Lattice System by Yamamoto, Hajime, Kamiyama, Sachiko, Yamada, Ikuya, Kimura, Hiroyuki

“…In one-dimensional systems with partially filled valence bands, simultaneous changes occur in the electronic states and crystal structures. This is known as…”
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Large negative thermal expansion induced by cation dimerization in ilmenite-type vanadate ceramic by Yamamoto, Hajime, Kamiyama, Sachiko, Nishikubo, Takumi, Azuma, Masaki, Yamada, Ikuya, Kimura, Hiroyuki

“…A significant negative thermal expansion (NTE) in an ilmenite-type MgVO3 ceramic is reported in this paper. MgVO3 undergoes V–V dimerization at 500–550 K…”
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Benefits of intermediate-layer formation at the interface of Nb/Cu and Ta/Cu explosive clads by Parchuri, PradeepK, Kotegawa, Shota, Yamamoto, Hajime, Ito, Kazuhiro, Mori, Akihisa, Hokamoto, Kazuyuki

“…A systematic, comparative study was carried out to quantitatively characterize the bending strength of wavy interfaces with and without an intermediate layer…”
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Fatigue strength improvement due to alloying steel weld toes with WC tool constituent elements through friction stir processing by Yamamoto, Hajime, Koga, Shodai, Ito, Kazuhiro, Mikami, Yoshiki

“…Friction stir processing (FSP) enables surface modifications can likely be applied as a new post-weld treatment for improving fatigue strength. When applying…”
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Stability of Polar Structure in Filling-Controlled Giant Tetragonal Perovskite Oxide PbVO3 by Yamamoto, Hajime, Ogata, Takahiro, Sakai, Yuki, Azuma, Masaki

“…The crystal structure and stability of a giant tetragonal phase in electron-doped Pb1–x Bi x VO3 (x = 0.1, 0.2, and 0.3) and hole-doped Pb1–x Na x VO3 (x =…”
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Single Crystal Growth of Ilmenite-Type MnVO3 by Solid-State Recrystallization by Kamiyama, Sachiko, Sakakura, Terutoshi, Kimura, Hiroyuki, Sagayama, Hajime, Kishimoto, Shunji, Yamada, Ikuya, Yamamoto, Hajime

“…We successfully obtained high-quality single-domain crystals of ilmenite-type MnVO3 under high-pressure and high-temperature conditions (4 GPa and 1173 K for…”
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Magnetic field-induced phase transition in ilmenite-type CoVO3 by Yamamoto, Hajime, Wu, Hung-Cheng, Miyake, Atsushi, Tokunaga, Masashi, Suzuki, Akio, Honda, Takashi, Kimura, Hiroyuki

“…The ilmenite-type CoVO3 undergoes an antiferromagnetic transition below 140 K, and the tetravalent vanadium ions form V–V dimers below 550 K. This paper…”
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Weld toe modification using spherical-tip WC tool FSP in fatigue strength improvement of high-strength low-alloy steel joints by Yamamoto, Hajime, Danno, Yoshikazu, Ito, Kazuhiro, Mikami, Yoshiki, Fujii, Hidetoshi

“…Fatigue strength of fusion-welded joints is lower than that of the base metal due to stress concentration, tensile residual stress, and microstructural…”
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Protocol for viral vector-mediated measurement of transcription factor activity of mouse brain by Yamamoto, Hajime, Abe, Kentaro

“…Here, we provide a step-by-step protocol to measure the activities of multiple transcription factors (TFs) in the same mouse brain. This protocol includes a…”
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Reversible thermally controlled spontaneous magnetization switching in perovskite-type manganite by Yamamoto, Hajime, Sekikawa, Satoru, Taniguchi, Haruka, Matsukawa, Michiaki, Shigematsu, Kei, Honda, Takashi, Yamauchi, Kunihiko, Ikeda, Kazutaka, Otomo, Toshiya, Sakakura, Terutoshi, Azuma, Masaki, Nimori, Shigeki, Noda, Yukio, Kimura, Hiroyuki

“…Reversible, thermally controlled, spontaneous magnetization switching (reversible TCSMS) is demonstrated in the absence and presence of an external magnetic…”
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Colossal Volume Contraction in Strong Polar Perovskites of Pb(Ti,V)O3 by Pan, Zhao, Chen, Jun, Jiang, Xingxing, Hu, Lei, Yu, Runze, Yamamoto, Hajime, Ogata, Takahiro, Hattori, Yuichiro, Guo, Fangmin, Fan, Xi’an, Li, Yawei, Li, Guangqiang, Gu, Huazhi, Ren, Yang, Lin, Zheshuai, Azuma, Masaki, Xing, Xianran

“…The unique physical property of negative thermal expansion (NTE) is not only interesting for scientific research but also important for practical applications…”
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Direct Observation of Magnetization Reversal by Electric Field at Room Temperature in Co-Substituted Bismuth Ferrite Thin Film by Shimizu, Keisuke, Kawabe, Ryo, Hojo, Hajime, Shimizu, Haruki, Yamamoto, Hajime, Katsumata, Marin, Shigematsu, Kei, Mibu, Ko, Kumagai, Yu, Oba, Fumiyasu, Azuma, Masaki

“…Using the electric field to manipulate the magnetization of materials is a potential way of making low-power-consumption nonvolatile magnetic memory devices…”
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Surface Microstructure Modifications of Low Carbon Steel Welds Produced by Low-Heat-Input Friction Stir Processing by Yamamoto, Hajime, Nishiura, Tomohiro, Nishibata, Hitomi, Yonemura, Mitsuharu, Fujiwara, Kazuki, Kawano, Kaori, Ito, Kazuhiro

“…Friction stir processing (FSP) is a solid state method for surface modifications through severe plastic deformation and frictional heat using a rotational…”
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Electric-Field-Induced Reorientation of the Magnetic Easy Plane in a Co-Substituted BiFeO3 Single Crystal by Yamamoto, Hajime, Sakai, Yuki, Shigematsu, Kei, Aoyama, Takuya, Kimura, Tsuyoshi, Azuma, Masaki

“…Single crystals of BiFe0.9Co0.1O3 and BiFe0.892Mn0.008Co0.1O3, room temperature ferroelectric ferromagnets, were successfully grown by a flux method at a high…”
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Investigation of gridding effects for numerical simulations of CO2 geologic sequestration by Yamamoto, Hajime, Doughty, Christine

“…Potential errors caused by grid shape and resolution are investigated for numerical simulations of CO2 geologic sequestration. The spatial orientation of…”
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Synergistic Effect between Fe4+ and Co4+ on Oxygen Evolution Reaction Catalysis for CaFe1−xCoxO3 by Yamada, Ikuya, Tanaka, Atsushi, Oda, Seiji, Okazaki, Yuichi, Toda, Fumito, Kato, Yuta, Kizawa, Yuta, Oshita, Masaya, Goto, Manami, Morimura, Amane, Ochi, Asuka, Toda, Kaoru, Wang, Wencong, Yamamoto, Hajime, Ikeno, Hidekazu, Yagi, Shunsuke

“…Chemical substitution is an effective way to improve electrocatalytic properties in transition metal oxides. We investigate the synergistic effect between Fe4+…”
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Large Negative Thermal Expansion Induced by Synergistic Effects of Ferroelectrostriction and Spin Crossover in PbTiO3‑Based Perovskites by Pan, Zhao, Chen, Jun, Yu, Runze, Patra, Lokanath, Ravindran, Ponniah, Sanson, Andrea, Milazzo, Ruggero, Carnera, Alberto, Hu, Lei, Wang, Lu, Yamamoto, Hajime, Ren, Yang, Huang, Qingzhen, Sakai, Yuki, Nishikubo, Takumi, Ogata, Takahiro, Fan, Xi’an, Li, Yawei, Li, Guangqiang, Hojo, Hajime, Azuma, Masaki, Xing, Xianran

“…The discovery of unusual negative thermal expansion (NTE) provides the opportunity to control the common but much desired property of thermal expansion, which…”
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