Foundation for Promotion of Material Science and Technology of Japan

Setagaya ku, Japan

Foundation for Promotion of Material Science and Technology of Japan

Setagaya ku, Japan
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Saito S.,Tohoku University | Nozawa N.,Tohoku University | Hinata S.,Tohoku University | Hinata S.,Japan Society for the Promotion of Science | And 4 more authors.
Journal of Applied Physics | Year: 2015

An atomic layer stacking structure in hexagonal close packed (hcp) Co100-xPtx alloy films with c-plane sheet texture was directly observed by a high-angle annular dark-field imaging scanning transmission electron microscopy. The analysis of sequential and/or compositional atomic layer stacking structure and uniaxial magnetocrystalline anisotropy (Ku = Ku1 + Ku2) revealed that (1) integrated intensity of the superlattice diffraction takes the maximum at x = 20 at. % and shows broadening feature against x for the film fabricated under the substrate temperature (Tsub) of 400 °C. (2) Compositional separation structure in atomic layers is formed for the films fabricated under Tsub = 400 °C. A sequential alternative stacking of atomic layers with different compositions is hardly formed in the film with x = 50 at. %, whereas easily formed in the film with x = 20 at. %. This peculiar atomic layer stacking structure consists of in-plane-disordered Pt-rich and Pt-poor layers, which is completely different from the so-called atomic site ordered structure. (3) A face centered cubic atomic layer stacking as faults appeared in the host hcp atomic layer stacking exists in accompanies with irregularities for the periodicity of the compositional modulation atomic layers. (4) Ku1 takes the maximum of 1.4 × 107erg/cm3 at around x = 20 at. %, whereas Ku2 takes the maximum of 0.7 × 107erg/cm3 at around x = 40 at. %, which results in the maximum of 1.8 × 107erg/cm3 of Ku at x = 30 at. % and a shoulder in compositional dependence of Ku in the range of x = 30-60 at. %. Not only compositional separation of atomic layers but also sequential alternative stacking of different compositional layers is quite important to improve essential uniaxial magnetocrystalline anisotropy. © 2015 AIP Publishing LLC.

Nozawa N.,Tohoku University | Saito S.,Tohoku University | Kimura T.,Tohoku University | Shibuya K.,Foundation for Promotion of Material Science and Technology of Japan | And 3 more authors.
Applied Physics Letters | Year: 2013

Co80Ir20 films with negative uniaxial magnetocrystalline anisotropy (Ku) are investigated with respect to the regularity of the stacking sequence and atomic site arrangement. Substrate heating at 600 °C enhances the negative Ku of Co 80Ir20 to -9.6 × 106 erg/cm3. X-ray diffraction analysis and scanning transmission electron microscopy of the Co80Ir20 film fabricated at 600 °C indicate (1) a near perfect hexagonal-close-packed (hcp) stacking structure and (2) an atomic layered structure that consists of randomly sequenced Ir-rich and Ir-poor layers. These hcp and composition-modulated atomic layer stacking structures are considered to be the reason for the enhancement of the negative Ku. © 2013 American Institute of Physics.

PubMed | Toho University, Kanagawa University and Foundation for Promotion of Material Science and Technology of Japan
Type: | Journal: Forensic science international | Year: 2016

A high-performance liquid chromatography-tandem mass spectrometry (LC/MS/MS) with electrospray ionization (ESI) procedure for the simultaneous determination of nine local anesthetic drugs (procaine, mepivacaine, lidocaine, ropivacaine, oxybuprocaine, tetracaine, bupivacaine, T-caine and dibucaine) in human serum is described. The chromatographic separation was performed on a Mightysil-RP-18 GP II column (2.0mm150mm, particle size 5m). The mobile phase consisted of 10mM acetic ammonium buffer (pH 5.4) and acetonitrile and was delivered at a flow rate of 0.20mL/min. The triple quadrupole mass spectrometer was operated in positive ion mode, and multiple reaction monitoring was used for drug quantification. Solid-phase extraction of the nine local anesthetic drugs added to the human serum was performed with an Oasis() HLB extraction cartridges column. The method was linear for the investigated drugs over the concentration range of 10-100ng/mL. The recoveries of these drugs were in the range of 81.4-144%. The standard deviation (SD) values for all analytes were <0.10 for both intraday and interday accuracy and precision. The selectivity, accuracy and precision of this method are satisfactory for clinical and forensic applications. The sensitive and selective method offers the opportunity for the simultaneous screening and quantification, for clinical and forensic purposes, of almost all local anesthetics available in Japan.

Machida M.,Japan Atomic Energy Agency | Okumura M.,Japan Atomic Energy Agency | Nakamura H.,Japan Atomic Energy Agency | Sakuramoto K.,Foundation for Promotion of Material Science and Technology of Japan
Mathematics and Computations, Supercomputing in Nuclear Applications and Monte Carlo International Conference, M and C+SNA+MC 2015 | Year: 2015

In order to clarify physicochemical behaviors of radioactive Cs released into environment from the Fukushima Daiichi nuclear power plants, we study on two issues, i.e., hydration structures of Cs+ and its adsorption on a specific edge in a clay particle (mica) by employing first principles calculations. After the fallout on the land, radioactive Cs+ inside water droplets has been mainly adsorbed on clay surfaces and transferred into a specific edge called "Frayed Edge Site", which strongly stabilizes Cs. Thus, Cs mainly migrates together with the clay particles by water flow, while a part of Cs is dissolved into water as a cation, again. Relevant to these transport processes, we find that the above two situations are important as the chemical form of Cs in environment. However, since the two forms are too small to experimentally study in details, the first-principles calculation is a powerful tool. In this paper, firstly, we report on hydration structures of Cs+ by using Born-Oppenheimer first-principles molecular dynamics. Our striking finding in the hydration structures is that Cs+ has no clear second hydration shell in contrast to any other alkali cations. Secondly, we construct a model of the Frayed Edge Site and confirm that the model actually becomes selective for Cs when expanding the interlayer distance from that of the original crystal structure through the calculation of the ion-exchange energy. Copyright © (2015) by the American Nuclear Society All rights reserved.

Oonishi S.,Tokyo Institute of Technology | Kawamura M.,Tokyo Institute of Technology | Takano N.,Foundation for Promotion of Material Science and Technology of Japan | Hashimoto D.,Foundation for Promotion of Material Science and Technology of Japan | And 2 more authors.
Thin Solid Films | Year: 2011

Grain boundary (GB) properties of Cu(InGa)Se2 thin film were measured using electron beam induced current (EBIC), electron back scatter diffraction patterns (EBSD) and scanning spreading resistance microscopy (SSRM) methods. The weak EBIC signal was observed in back-side grains which were separated by the random grain boundaries (GBs) running parallel to the substrate. Furthermore, it was shown by the SSRM that the tilt GBs had low resistivity. The two phenomena were explained by our previous proposed GB model [1]. Finally, the grain with a weak EBIC signal was assessed by the transmission electron microscope (TEM), and it was found that the grain had a twin cluster. The edge of the cluster reached at the CdS/CIGS interface, and the interface was disordered, which caused the minority carrier to sink, limiting the solar cell performance. © 2011 Elsevier B.V.

Okayasu M.,Akita Prefectural University | Sato K.,Foundation for Promotion of Material Science and Technology of Japan | Kusaba Y.,Foundation for Promotion of Material Science and Technology of Japan
Journal of the European Ceramic Society | Year: 2011

To better understand the domain switching characteristics of lead zirconate titanate (PZT) ceramics, the orientations of domains have been directly investigated during loading and unloading using various experimental techniques. Upon loading, linear and non-linear fracture mechanics of the PZT ceramics are observed. The slope of the stress-strain response is attributed mainly to lattice strain and domain switching strain. During the loading process, electrical activity also occurs several times in the PZT ceramics. This activity is related to a lightning-like phenomenon and consists of a bright flash with a click. This electrogenerative event is caused by severe domain switching. The characteristics of domain switching and reverse switching are detected during the loading and unloading processes. The amount of domain switching depends on the grain, due to different stress levels. In addition, two patterns of 90° domain switching systems are characterized, namely (i) 90° turn about the tetragonal c-axis and (ii) 90° rotation of the tetragonal a-axis. © 2010 Elsevier Ltd.

Kawamura M.,Tokyo Institute of Technology | Yamada T.,Foundation for Promotion of Material Science and Technology of Japan | Suyama N.,Foundation for Promotion of Material Science and Technology of Japan | Yamada A.,Tokyo Institute of Technology | Konagai M.,Tokyo Institute of Technology
Japanese Journal of Applied Physics | Year: 2010

The grain boundary (GB) properties of polycrystalline Cu(In 1-xGax)Se2(CIGS) have been characterized using electron beam-induced current (EBIC) measurements, electron backscatter diffraction (EBSD) patterns, and scanning spreading resistance microscopy (SSRM) measurements. The polished cross section of CIGS solar cells was evaluated by these three methods, and the surface EBIC image was obtained by scanning electron microscopy (SEM). A combination of the EBIC and EBSD techniques makes it possible to investigate the effect of the GBs on the minority carrier collection. Furthermore, the SSRM mapping enables the analysis of grain-by-grain carrier profiling by measuring the spreading resistance of CIGS solar cells. It was found from these results that the twin boundaries of CIGS grains do not contribute to carrier recombination. Furthermore, the brighter EBIC signals were observed at the GBs of CIGS, which showed that the produced electron-hole pairs easily separate from each other and that the minority carriers are repelled from the GBs. This remarkable property of the GBs is suitable for application of CIGS to solar cells. © 2010 The Japan Society of Applied Physics.

Asakura T.,Tokyo University of Agriculture and Technology | Sato Y.,Tokyo University of Agriculture and Technology | Sato Y.,Foundation for Promotion of Material Science and Technology of Japan | Aoki A.,Tokyo University of Agriculture and Technology
Macromolecules | Year: 2015

It is important to understand the conformational changes of both the crystalline and the noncrystalline domains of Bombyx mori silk fibroin as they are stretched from soluble Silk I to the mature Silk II fiber, to be able to design man-made strong and tough silk fibers. Here, the Ser, Tyr, and Ala Cβ of silk fibroin were labeled by 13C to obtain domain-specific structural information, because Ser residues are present predominantly in the crystalline domains, Tyr predominantly in the noncrystalline domains and Ala residues in both domains. The conformational change was monitored by 13C CP/MAS NMR using the conformation-dependent 13C NMR chemical shift. With increasing stretching ratio, initially there is a change from Silk I∗ (a repeated type II β-turn structure) to β-sheet in the longer AGSGAG sequences, followed by shorter AGSGAG sequences, while the noncrystalline domains change gradually from random coil to β-sheet during the whole conformational change. (Figure Presented). © 2015 American Chemical Society.

Yajima T.,University of Tokyo | Fujiwara K.,RIKEN | Nakao A.,RIKEN | Kobayashi T.,RIKEN | And 9 more authors.
Japanese Journal of Applied Physics | Year: 2010

The change in the spatial distribution of oxygen ions after an initial voltage application called the forming process was investigated for oxide resistance switching devices by secondary ion mass spectrometry mapping. To track the motion of oxygen ions, tracer 18O ions were implanted in a planar Pt/CuO/Pt device. We found clear evidence for the oxygen reduction in the conductive bridge structure formed between two electrodes. In addition, the oxygen ions in the bridge structure drift to the anode, implying the oxygen diffusion (migration) induced by high electric field and/or current density. We discuss those results in terms of a filament model. © 2010 The Japan Society of Applied Physics.

Sasuga-Araki S.,Foundation for Promotion of Material Science and Technology of Japan | Suzuki K.,Nagoya Institute of Technology | Okabayashi H.,Nagoya Institute of Technology | O'Connor C.J.,University of Auckland
Colloid and Polymer Science | Year: 2013

The microstructures of concentrated aqueous solutions of n-butyl(n-dodecyl)phosphate (BDoP) and n-hexyl(n-dodecyl)phosphate (HDoP) anions, as asymmetric double-chain surfactants, were studied using X-ray diffraction and Raman scattering techniques. The results indicated a marked difference in the aggregate behavior between BDoP and HDoP, attributed to the difference in the extent of the steric effect of the two short chains. The Raman scattering spectra provided direct evidence of the steric effect. This marked difference in the steric effect is clearly reflected in the phase structures of the BDoP and HDoP water binary systems. © 2013 Springer-Verlag Berlin Heidelberg.

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