A5073165376- Physics of Superconductivity and Magnetism
- Advanced Photocatalysis Techniques
- Luminescence Properties of Advanced Materials
- Advanced Condensed Matter Physics
- TiO2 Photocatalysis and Solar Cells
- Magnetic and transport properties of perovskites and related materials
- Catalytic Processes in Materials Science
- Electrocatalysts for Energy Conversion
- Polyoxometalates: Synthesis and Applications
- Superconducting Materials and Applications
- Electrochemical Analysis and Applications
- Electronic and Structural Properties of Oxides
- Solid-state spectroscopy and crystallography
- Microwave Dielectric Ceramics Synthesis
- Ammonia Synthesis and Nitrogen Reduction
- Crystal Structures and Properties
- X-ray Diffraction in Crystallography
- Catalysis and Oxidation Reactions
- Iron-based superconductors research
- Chemical Synthesis and Characterization
- Superconductivity in MgB2 and Alloys
- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Magnetic properties of thin films
- HVDC Systems and Fault Protection
Tohoku University
2006-2018
Nagase ChemteX (Japan)
2014-2017
Czech Academy of Sciences, J. Heyrovský Institute of Physical Chemistry
2009-2014
Czech Academy of Sciences
2009-2014
Sumitomo Metal Mining (Japan)
2010
Northeastern University
2009
Joensuu Science Park
2008
Tokyo Institute of Technology
1997-2006
Seikagaku Corporation (Japan)
2006
Mitsubishi Chemical Group Science and Technology Research Center (Japan)
2006
Oxygen evolution catalysis is restricted by the interdependence of adsorption energies reaction intermediates and surface reactivity.
Abstract The fusion power density produced in a tokamak is proportional to its magnetic field strength the fourth power. Second-generation high temperature superconductor (2G HTS) wires demonstrate remarkable engineering current (averaged over full wire), J E , at very fields, driving progress and other applications. key challenge for HTS has been offer an acceptable combination of consistent superconducting performance volume supply, low price. Here we report reproducible practical based on...
Controlling gas emissions: Versatile control of the selectivity an oxide electrocatalyst in oxygen- and chlorine-evolution reactions was demonstrated by Zn substitution RuO2 (see picture: O red, Cl green, blue, Ru white). The incorporation into rutile structure alters cation sequence along [001] direction modifies active sites for both gas-evolution processes.
A complex pattern: Single-phase brookite, rutile, and rutile–anatase nanoparticles can be prepared from the new water-soluble titanium(IV) (NH4)6[Ti4(C2H2O3)4(C2H3O3)2(O2)4O2]⋅4 H2O. It appears that structural similarity of anion to brookite architecture allows directional synthesis nanopowders in a pure form (see scheme).
Abstract The growing significance of nanocrystalline inorganic functional materials in the fields catalysis, electronics, and energy conversion together with increasing demand society for safer, softer, “greener” technologies has drawn considerable attention researchers toward water-based solution processes synthesis such materials. In this respect complex oxides, containing d0-transition metals, as Ti, Nb, Ta, or Si represent an outstanding challenge chemists due to extremely narrow range...
The SuperOx and Japan LLC companies were founded with the goal of developing a cost-effective technology for second generation HTS (2G HTS) tapes by utilizing combination most advanced chemical physical deposition techniques, together implementing original tape architectures. In this paper we present brief overview our production experimental facilities recent results 2G fabrication, describe first tests in model cables AC DC power application.
Ammonium citratoperoxotitanate(IV), (NH4)8[Ti4(C6H4O7)4(O2)4]·8H2O, was isolated in the solid form. Its crystal structure solved and refined using single-crystal X-ray data. The compound crystallizes a monoclinic cell with = 10.237(2) Å, b 17.537(4) c 14.713(3) β 100.35(1)° (Z 2, fw 1360.40, ρcalc 1.74 g/cm3) space group P21/n (No. 14). determined of titanium complex agrees well Raman NMR spectroscopic We speculate that tight coordination molecule is responsible for high stability this...
We report the first successful synthesis of TiO2(B) nanoparticles by a one-step hydrothermal process. The process was performed under acidic conditions in 0.59 M H2SO4 solution at 160 °C for 24 h or 200 6 using titanium metal complex with glycolic acid. prepared were characterized XRD, Raman spectroscopy, and TEM. is metastable phase one most intriguing forms oxide. All methods reported to date have required multistep involving solid-state an alkali titanate, ion-exchange reaction, gentle...
Reproducibility of superconducting properties and suitability for specific applications by means customised finish are two important attributes required from commercial 2G HTS wire. This paper reviews the consistent performance SuperOx production wire describes novel customisation options: surround polyimide varnish insulation composite bulk materials assembled with wires soldered together.
Nanocrystalline electrocatalytically active materials of chemical composition Ru1−xZnxO2 (0< x < 0.3) were synthesized by freeze-drying technique. The diffraction patterns the prepared samples corresponded to single-phase rutile type oxides. Local structure Ru1−x ZnxO2 based on refinement Ru K and Zn edge EXAFS functions shows clustering ions in blocks with ilmenite intergrowing Ru-rich blocks. oxides are selective catalysts for anodic oxygen evolution. selectivity toward evolution presence...
Abstract This study investigates the impact of heavy ion irradiation on superconducting performance second-generation high-temperature (2G-HTS) wires in strong magnetic fields. We performed experiments using 18MeV Au, 12MeV Ni and 15MeV O ions accelerated by a tandem accelerator, targeting 2G-HTS composed YBCO, EuBCO/BHO, GdBCO, or (NdEuGd)BCO. The properties these were measured under various fields temperatures. Our results indicate that oxygen had minimal effect Ic(B) characteristics. In...
Stable water-soluble diammonium tris(2-hydroxypropionato)titanate(IV) [ammonium trilactatotitanate(IV)], (NH4)2[Ti(C3H4O3)3], was prepared in the crystalline form. According to X-ray single-crystal diffraction data, this compound crystallizes cubic cell with a = 11.649(4) Å, space group P213 (no. 198), and has Z 4 molecules per unit cell. The 13C NMR data Raman IR spectra support determined structure. absence of nonbonded functional groups restricts formation oligomers contrast reported...
Chemical composition, crystal structure, as well short-range atomic arrangement of nanocrystalline Ru1−xNixO2−δ oxides with x ranging between 0 and 0.3 were studied using energy dispersive X-ray spectroscopy (EDX), photoelectron (XPS), absorption (XAS). The prepared materials form single-phase nanocrystals rutile structure. Regardless the chemical surface is Ni-enriched respect to overall composition. According both XPS XANES, oxidation state Ru remains +4 in materials. Ni ions are present...
An industrial R&D programme is ongoing at SuperOx, aimed improving 2G HTS wire performance in magnetic field. We introduce perovskite artificial pinning centres (APC) into the layer matrix. In contrast to most studies described literature, we use high rate production processing parameters and PLD equipment SuperOx. This paper reports results of Phase I this programme. fabricated wires by pulsed laser deposition GdBCO films doped with 6%, 12% 18% (molar) BaSnO3 6% BaZrO3, compared their an...
Nanocrystalline Mg-doped ruthenium dioxide catalysts with the formula Ru1-xMgxO2 (0 ≤ x 20) were synthesized by spray-freezing freeze-drying technique. Synthesized materials are of nanoparticulate nature and show a single phase diffraction pattern conforming to tetragonal oxide rutile structural type. Magnesium ions not distributed homogeneously in material, but exist Mg-rich clusters as shown X-ray absorption spectroscopy. The refinement Mg EXAFS functions for low content shows that...
High-brightness Y2O2S red phosphor powders with sub-micrometer particle size were prepared by complex homogeneous precipitation method employing hydrolysis of urea in water solutions various diols. Sulfurization was carried out annealing the obtained at 700−1200 °C presence Na2CO3−S mixture. Despite small size, luminescence intensity for most samples comparable one best available commercial phosphors, while doped Eu and a amount Tb superior to reference.
Nanowhiskers of rutile‐type titanium dioxide (TiO 2 ) were synthesized by a simple hydrothermal treatment water‐soluble titanium–glycolate complex at 473 K. The aspect ratio the obtained rutile particles could be controlled changing concentration glycolic acid additive in starting aqueous solution complex. According to high‐resolution transmission electron microscopy, whisker‐like nanoparticles grow along c ‐axis rutile, side facets which are (110), (−110), (1–10), and (−1–10). Glycolic...
The stable water-soluble tantalum complex with lactic acid (ammonium tetralactatodiperoxo-μ-oxo-ditantalate(V)), (NH4)4[Ta2(C3H4O3)4(O2)2O]·3H2O, was prepared in the crystalline form. According to single-crystal X-ray diffraction data, this compound forms a monoclinic cell = 13.85(2) Å, b 9.06(1) c 12.32(2) and β 116.30°, space group C2 (No. 2), has Z 2 molecules per unit cell. solid-state 13C NMR data low flack parameter are consistent determined structure. Appearance of same vibration...