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Xie G.,Advanced Institute for Materials Research | Li S.,Advanced Institute for Materials Research | Louzguine-Luzgin D.V.,Advanced Institute for Materials Research | Sato M.,Japan National Institute for Fusion Science | Inoue A.,Tohoku University
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science | Year: 2010

Using a gas-atomized Ni59.35Nb34.45Sn6.2 metallic glassy alloy powder blended with Sn powder of various contents, Ni-Nb-Sn bulk metallic glassy matrix composites were fabricated by a microwave (MW)-induced sintering process in a single-mode 2.45 GHz MW applicator in a separated magnetic field. The Ni59.35Nb34.45Sn 6.2 glassy alloy powder and its mixed powders containing Sn particles could be heated well in the magnetic field. The addition of Sn particles promoted densification of the sintered Ni59.35Nb 34.45Sn6.2 metallic glassy powder. Bulk samples without crystallization of the glassy matrix and with good bonding state among the particles were achieved at a sintering temperature of 833 K. © The Minerals, Metals & Materials Society and ASM International 2009.

News Article | October 23, 2015
Site: phys.org

Researchers at Tohoku University's Advanced Institute for Materials Research (AIMR) have carried out a collaborative study aimed at precisely controlling phase transformations with high spatial precision, which represents a significant step forward in realizing new functionalities in confined dimensions.

Wakimoto S.,Japan Atomic Energy Agency | Ishii K.,Japan Atomic Energy Agency | Kimura H.,Tohoku University | Ikeuchi K.,Research Center for Neutron Science and Technology | And 12 more authors.
Physical Review B - Condensed Matter and Materials Physics | Year: 2013

We have performed resonant inelastic x-ray scattering (RIXS) near the Cu-K edge on cuprate superconductors La2-xSrxCuO4, La2-xBaxCuO4, La2-xSr xCu1-yFeyO4, and Bi 1.76Pb0.35Sr1.89CuO6+δ, covering underdoped to heavily overdoped regimes and focusing on charge excitations inside the charge-transfer gap. RIXS measurements of the 214 systems with Ei=8.993 keV have revealed that the RIXS intensity at 1-eV energy transfer has a minimum at (0,0) and maxima at (±0.4π,0) and (0,±0.4π) for all doping points regardless of the stripe-ordered state, suggesting that the corresponding structure is not directly related to stripe order. Measurements with Ei=9.003 keV on metallic La 1.7Sr0.3CuO4 and Bi1.76Pb 0.35Sr1.89CuO6+δ exhibit a dispersive intraband excitation below 4 eV, similar to that observed in the electron-doped Nd1.85Ce0.15CuO4. This is the first observation of a dispersive intraband excitation in a hole-doped system, evidencing that both electron- and hole-doped systems have a similar dynamical charge correlation function. © 2013 American Physical Society.

Takahashi T.,Tohoku University | Makihata M.,Tohoku University | Esashi M.,Advanced Institute for Materials Research | Tanaka S.,Tohoku University
IEEJ Transactions on Sensors and Micromachines | Year: 2010

ProTEK PSB and ProTEK B3 (Brewer Science, Inc.) are negative type photosensitive resist and non-photosensitive resist for alkaline wet etching, respectively. This paper mainly reports the patterning characteristics, etch resistance and removal characteristics of ProTEK PSB under practical conditions for a real application. Our study found two problems of ProTEK PSB: unacceptably-large side-etching and difficulty in removing the primer by organic solvents or O2 ashing. For the fabrication of a LSI-integrated tactile sensor, we used ProTEK PSB with a low temperature oxide underlayer. This combination solves both side etching problem for ProTEK PSB and pinhole problem for low temperature oxide, providing the practical alkaline etching mask which can be prepared at low temperature. © 2010 The Institute of Electrical Engineers of Japan.

Kasuya M.,Tohoku University | Mizukami M.,Tohoku University | Kurihara K.,Tohoku University | Kurihara K.,Advanced Institute for Materials Research
Bunseki Kagaku | Year: 2010

Surface force measurements represent a powerful tool for the molecular-level characterization of water at solid-liquid interfaces, which is important for various functionalized interfaces, including biointerfaces. We have studied the properties of interfacial water using surface force measurements and resonance shear measurements, which we developed. This paper summarizes some of our recent research : (1) water confined between mica surfaces and (2) the molecular macrocluster formation of water adsorbed on silica surfaces. © 2010 The Japan Society for Analytical Chemistry.

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