Materials Literature
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Renormalized transmission ellipsometry was applied to the precise measurement of anistropic refractive indices of nematic liquid crystals. It is quite beneficial for electrical industry that the conventional sandwich-type liquid crystal cell becomes an applicable sample and experimental measurement can be carried out…
Time-resolved EPR spectra of the lowest excited triplet state of boron subphthalocyanine chloride have been measured in toluene at various temperatures (5−360 K). On the basis of the observed and simulated spectra, electronic structure and molecular motion of the triplet state ( 1 T) were analyzed, both in solid and f…
Vertically aligned carbon nanotubes (CNTs) with multiwalled structures were successfully grown on a Fe-deposited Si substrate at low temperatures below 300°C by microwave plasma chemical vapor deposition using of a CH 4 –CO 2 gas mixture. The low temperature would be beneficial for reducing the diameter of CNTs but it…
For the paramagnetic insulating phase in the metal-ordered manganite YBaMn2O6, the so-called CE-type of charge/orbital ordered state was observed within the monoclinic ab-plane, which is most commonly observed for the ordinary half doped manganites. However, TEM revealed a 4-fold periodicity along the c-axis, suggesti…
ESR investigations were performed for a series of quasi-one-dimensional organic conductors, (TMTTF) 2 X . The ESR linewidth shows abrupt jumps or humps in the paramagnetic insulating region. The (TMTTF) 2 X salts are roughly divided into three groups according to the anisotropy of the ESR linewidth at low temperatures…
We demonstrate UV generation in CSB3O5 (CBO) crystals grown by the top-seeded solution growth technique. 355-nm UV light was generated by use of a type II CBO crystal as a sum frequency of the fundamental light and the second harmonic of a nanosecond Nd:YVO4 laser. A 3.0-W output of the third-harmonic was obtained at…
X-ray absorption near edge structure (XANES) spectroscopy, temperature-programmed reduction (TPR), and temperature-programmed oxidation (TPO) were used in combination to determine the oxidation states of gold in clusters and complexes supported on MgO. The samples were also characterized by X-ray absorption fine struc…
Interactions of the CO molecule with the Cu + sites within MFI and FER matrices were investigated by means of the combined quantum mechanics/interatomic potential function method. CO molecules strongly interact with both dominant Cu + site types (on the channel wall and on the channel intersection) in high-silica zeol…
Linear and layered organically templated iron sulfates have been prepared under hydrothermal conditions. The linear iron sulfates, with the compositions [H 3 N(CH 2 ) 2 NH 3 ][FeF 3 (SO 4 )], I, [C(NH 2 ) 3 ] 2 [FeF(SO 4 ) 2 ], II, [H 3 N(CH 2 ) 2 NH 2 (CH 2 ) 2 NH 3 ][FeF(SO 4 ) 2 ], III, and [H 2 N(CH 2 ) 4 NH 2 ][F…
Polyelectrolyte multilayers have been prepared by consecutively adsorbing poly(diallyldimethylammonium chloride) (PDADMAC) and poly(sodium 4-styrenesulfonate) (PSS) from aqueous solution onto colloidal silica (70−100 nm in diameter), with a total of five bilayers being prepared. The multilayer growth was followed by e…
Organic alloys λ-(BETS) 2 Fe x Ga 1- x Cl 4 show superconductivity only under very high magnetic fields parallel to the conducting layer for x ≥0.47. As x decreases, the field induced superconducting phase shifts towards lower fields and a striking field-induced insulator to superconductor transition is observed below…
The electronic properties of quarter-filled organic materials showing spin-Peierls transition are investigated theoretically. By studying the one-dimensional extended Peierls-Hubbard model analytically as well as numerically, we find that there is a competition between two different spin-Peierls states due to the tetr…
The first EuS nanocrystals were prepared by the reaction of europium metal and H 2 S in liquid ammonia. X-ray diffraction (XRD) patterns and TEM images supported the formation of nanoscaled EuS crystals with average size of 20.4 nm. The nanocrystals showed blue shift compared with previously reported EuS films. The Cu…
Van Hove singularities (VHS) in the density of states of multiwalled carbon nanotubes (MWNTs) have been observed by optical spectroscopy for the first time to the authors' knowledge. Additionally, unexpected visible luminescence has been observed on photoexcitation at 1064 nm. This luminescence is believed to arise fr…
Sintered degenerate n-type PbTe samples with a grain size down to about 0.2 µm were prepared and their thermoelectric properties subsequently measured. Accordingly, the effects of grain size on thermoelectric properties were investigated. For samples with a grain size above ∼0.5 µm, the Seebeck coefficient and thermoe…
Oxygen nonstoichiometry of Ca 3 Co 4 O y was precisely measured by thermogravimetry. Combining the result of thermal decomposition analysis, this compound was found to be expressed as (CoO 2 ) 1.62 (Ca 2 CoO 3-δ ) with δ=0–0.14. The observed oxygen nonstoichiometry in the present system was much larger than those of o…
Dielectric and Piezoelectric Properties of Pb(In1/2Nb1/2)O3–Pb(Mg1/3Nb2/3)O3–PbTiO3 Ternary Ceramic Materials near the Morphotropic Phase Boundary, Hosono, Yasuharu, Yamashita, Yohachi, Sakamoto, Hideya, Ichinose, Noboru
Thermoreversible gels were formed by dissolving a poly(methyl methacrylate)−poly( tert -butyl acrylate)−poly(methyl methacrylate) triblock copolymer in a variety of alcohols, including ethanol, 1-butanol, 2-ethylhexanol, and 1-octanol. The gels exhibit an ideal and reversible solid/liquid transition in each of these s…
We have demonstrated the second harmonic of a frequency-tripled Nd:YVO4 laser with 2.5-mW quasi-cw output by using an optically contacted, prism-coupled KBe2BO3F2 crystal. We also achieved the second harmonic with a frequency-doubled single-mode Ti:sapphire laser at 172.5 nm and sum-frequency mixing with a dual-wavele…
An incorporation of 1-benzoyl-3-propylthiourea groups into siliceous mesopores of MCM-41 afforded an ordered material with open porosity. This material was prepared via a two-step modification by attachment of an aminopropyl functionality and its subsequent conversion into a thiourea ligand. About 1.5 mmol/g of 1-benz…