The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
T Sakai - One of the best experts on this subject based on the ideXlab platform.
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hydrogen storage and electrode properties of v based solid solution type alloys prepared by a thermic process
Journal of The Electrochemical Society, 2000Co-Authors: M Tsukahara, K Takahashi, T Kamiya, Akio Kawabata, Seiji Sakurai, Jun Shi, Hiroyuki T Takeshita, Nobuhiro Kuriyama, T SakaiAbstract:A vanadium-based solid-solution-type alloy V 4 TiNi 0.65 Co 0.05 Nb 0.047 Ta 0.047 with a large discharge capacity was obtained using a low-cost precursor of V 4 Ni 0.65 Nb 0.047 produced by aluminothermic reduction from V 2 O 5 , Nb 2 O 5 , and Ni, The alloy was deoxidized to a low level by adding mischmetal as a reducing agent when the precursor was alloyed with Ti, Co, and Ta. The alloy showed a hydrogen absorption behavior similar to an alloy prepared from high-purity constituent metals. Moreover, the Mm-Ni-O phase was precipitated as spherical particles along the TiNi network phase in the alloy, remarkably improving the electrode rate capability because of enhanced catalytic ability of the network phase.
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influence of oxygen on hydrogen storage and electrode properties for micro designed v based battery alloys
Journal of Alloys and Compounds, 1998Co-Authors: M Tsukahara, K Takahashi, A Isomura, T SakaiAbstract:Abstract The influence of oxygen on micro-structure, hydrogen storage and electrode properties were investigated for the alloy V 3 TiNi 0 . 5 6 Co 0 . 1 4 Nb 0 . 0 4 7 Ta 0 . 0 4 7 . Since titanium in the alloy worked as a Deoxidizer to form the oxide phase, the alloy preserved a large hydrogen capacity in the oxygen concentration range below 5000 mass ppm. More oxygen than 6000 mass ppm caused a remarkable contraction of the unit cell of the vanadium-based main phase and then a decrease in the hydrogen storage capacity. The contraction was accompanied by the precipitation of the Ti-based oxide phase.
Hiroshi Uchida - One of the best experts on this subject based on the ideXlab platform.
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one step fabrication of stretchable copper nanowire conductors by a fast photonic sintering technique and its application in wearable devices
ACS Applied Materials & Interfaces, 2016Co-Authors: Su Ding, Yanhong Tian, Teppei Araki, Tohru Sugahara, Shijo Nagao, Masaya Nogi, Hirotaka Koga, Katsuaki Suganuma, Hiroshi UchidaAbstract:Copper nanowire (CuNW) conductors have been considered to have a promising perspective in the area of stretchable electronics due to the low price and high conductivity. However, the fabrication of CuNW conductors suffers from harsh conditions, such as high temperature, reducing atmosphere, and time-consuming transfer step. Here, a simple and rapid one-step photonic sintering technique was developed to fabricate stretchable CuNW conductors on polyurethane (PU) at room temperature in air environment. It was observed that CuNWs were instantaneously deoxidized, welded and simultaneously embedded into the soft surface of PU through the one-step photonic sintering technique, after which highly conductive network and strong adhesion between CuNWs and PU substrates were achieved. The CuNW/PU conductor with sheet resistance of 22.1 Ohm/sq and transmittance of 78% was achieved by the one-step photonic sintering technique within only 20 μs in air. Besides, the CuNW/PU conductor could remain a low sheet resistance e...
M Tsukahara - One of the best experts on this subject based on the ideXlab platform.
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hydrogen storage and electrode properties of v based solid solution type alloys prepared by a thermic process
Journal of The Electrochemical Society, 2000Co-Authors: M Tsukahara, K Takahashi, T Kamiya, Akio Kawabata, Seiji Sakurai, Jun Shi, Hiroyuki T Takeshita, Nobuhiro Kuriyama, T SakaiAbstract:A vanadium-based solid-solution-type alloy V 4 TiNi 0.65 Co 0.05 Nb 0.047 Ta 0.047 with a large discharge capacity was obtained using a low-cost precursor of V 4 Ni 0.65 Nb 0.047 produced by aluminothermic reduction from V 2 O 5 , Nb 2 O 5 , and Ni, The alloy was deoxidized to a low level by adding mischmetal as a reducing agent when the precursor was alloyed with Ti, Co, and Ta. The alloy showed a hydrogen absorption behavior similar to an alloy prepared from high-purity constituent metals. Moreover, the Mm-Ni-O phase was precipitated as spherical particles along the TiNi network phase in the alloy, remarkably improving the electrode rate capability because of enhanced catalytic ability of the network phase.
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influence of oxygen on hydrogen storage and electrode properties for micro designed v based battery alloys
Journal of Alloys and Compounds, 1998Co-Authors: M Tsukahara, K Takahashi, A Isomura, T SakaiAbstract:Abstract The influence of oxygen on micro-structure, hydrogen storage and electrode properties were investigated for the alloy V 3 TiNi 0 . 5 6 Co 0 . 1 4 Nb 0 . 0 4 7 Ta 0 . 0 4 7 . Since titanium in the alloy worked as a Deoxidizer to form the oxide phase, the alloy preserved a large hydrogen capacity in the oxygen concentration range below 5000 mass ppm. More oxygen than 6000 mass ppm caused a remarkable contraction of the unit cell of the vanadium-based main phase and then a decrease in the hydrogen storage capacity. The contraction was accompanied by the precipitation of the Ti-based oxide phase.
Hyung Koun Cho - One of the best experts on this subject based on the ideXlab platform.
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Thermoelectric properties of a doped LaNiO3 perovskite system prepared using a spark-plasma sintering process
Electronic Materials Letters, 2013Co-Authors: Jang Yeul Tak, Soon Mok Choi, Won Seon Seo, Hyung Koun ChoAbstract:Both perovskites LaNiO3 and LaCuO3 have a limitation associated with phase transitions for high-temperature thermoelectric applications. The optimized conditions were investigated to obtain the LaNi1-xCuxO3-δ perovskite single phase showing a Cu-doping effect into Ni sites against unintended deoxidized phases. Three advantages of synergetic effects due to the simultaneous presence of nickel and copper were investigated: a low melting temperature of CuO as compared to that of NiO, the absence of intermediated deoxidized phases in the LaCuO3 system, and the Cu doping effect, which suppresses the formation of intermediate secondary phases. A solid solution was also fabricated using a spark-plasma sintering (SPS) process for the purpose of sintering LaNi1-xCuxO3-δ compositions at a low sintering temperature. © 2013 The Korean Institute of Metals and Materials and Springer Science+Business Media Dordrecht.
K. Ono - One of the best experts on this subject based on the ideXlab platform.
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Preparation and characterization of extra-low-oxygen titanium
Journal of Alloys and Compounds, 1992Co-Authors: T. H. Okabe, T. Oishi, K. OnoAbstract:Removal of oxygen in titanium by reaction with chemically active calcium dissolved in CaCl2was examined between 1273 and 1473 K with the purpose of obtaining extra low-oxygen titanium. CaCl2was used as a flux to facilitate the reaction by decreasing the activity of the by-product CaO. Titanium wires and small pieces of titanium were deoxidized to 20-60 mass ppm oxygen by use of calcium-saturated CaCl2at a temperature of 1273 K. Trace element analysis (e.g. glow discharge mass spectrometry), micro Vickers hardness measurements, and electrical resistivity measurements were carried out to characterize the deoxidized titanium. The deoxidation of electrolytically refined titanium wire produced titanium with a high residual resistivity ratio (ga298/α4.2{reversed tilde equals}100). The "ideal resistivities", or hypothetical resistivities of pure titanium, at 77 and 298 K were determined to be 40 and 440 nΩm respectively. The influence of oxygen on resistivity at 4.2 K was also measured by using titanium containing 30 and 500 mass ppm O, and was determined to be 88 nΩm (mol.% O)-1. © 1992.