Materials Literature
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Abstract Samples of highly syndiotactic poly(propylene) (s‐PP) crystallized in a C‐pseudo‐centered orthorhombic form are here characterized through high resolution solid state 13 C NMR sepctroscopy and wide angle X‐ray diffraction. The 13 C NMR CP MAS (cross‐polarization, magic angle spinning) spectra of highly disord…
Amorphous zirconia gel was hydrothermally treated at 250°C for 1–326 h in water and in NaOH water solution. Changes of the crystallite sizes and shapes were observed using TEM. The nature of these changes seems to be independent of the crystallization environment, but the rate of the process is much faster in the NaOH…
The interaction between partial discharge (PD) phenomena occurring in insulating systems is investigated in this paper. In particular, the recognition of two PD phenomena simultaneously active is approached by means of a 5-parameter additive Weibull distribution. Various shapes of the PD height distribution, obtained…
Time-dependent hydrodynamic interactions in a colloidal suspension of hard spheres are studied, both experimentally and through computer simulation. The focus is on the behavior at small wave vectors, which directly probes the temporal evolution of hydrodynamic interactions between nearby particles. The computer simul…
High-pressure fluorescence line narrowing (HPFLN) has been used to characterize the local structure of ${\mathrm{Eu}}^{3+}$ ions in sodium disilicate glass up to 210 kbar. HPFLN spectra, measured at 77 K, were analyzed using crystal-field theory. As pressure was increased from ambient to approximately 40 kbar, a redsh…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCocrystallization and Phase Segregation of Polyethylene Blends between the D and H Species. 7. Time-Resolved Synchrotron-Source Small-Angle X-ray Scattering Measurements for Studying the Isothermal Crystallization Kinetics: Comparison with the FTIR DataKohji Tashiro, Kouji I…
Calystegines are nortropane alkaloids with glycosidase inhibitor activity. They were found in different plant organs vary remarkably.
The direct crystal-to-glass transformation, i.e., spontaneous amorphization, which was first observed by thermal annealing of stishovite ${\mathrm{SiO}}_{2}$ at ambient pressure, has now been observed as an isothermal phenomenon during both compression and decompression of initially stable crystals. While counterintui…
Synthesis of high-purity, single-phase gallium nitride (GaN) powder has been achieved by reacting molten Ga with flowing ammonia (NH 3 ) in a hot wall tube furnace. The optimum temperature, NH 3 flow rate, and position of the boat in the hot wall tube furnace relative to the NH 3 inlet for the complete reaction to pur…
Using in-situ single crystal X-ray diffraction methods, thermally- and stress-induced crystal structure evolution was investigated in two Ni-Mn-Ga Heusler-type alloys. For the 51at.%Ni-24at.%Mn-25at.%Ga alloy it was found that application of external stress in a temperature range ~20 °C above the Ms at first causes in…
This paper is concerned with the role of the package of MOSFETs used in measurements of gamma dose in mixed gamma-neutron fields, in high energy bremsstrahlung and soft X-ray fields. It is shown that a kovar cap should be avoided for dosimetry applications in the presence of strong thermal neutron fluences. In regions…
The kinetics of infiltrating a solution precursor into Si 3 N 4 powder compacts were studied using either water or an aqueous solution of Zr‐nitrate and Y‐nitrate that formed a crystalline Zr(Y)O 2 (3 mol% Y 2 O 3 ) solid solution during pyrolysis. When the powder compact contained air, the infiltration involved two s…
This paper represents an attempt to understand, from basic principles, the origins of hysteresis during variant rearrangement. As a framework for this study, we focus on the biaxial loading experiments conducted in on single crystals of γ' martensite, oriented so that two compound twinned variants of martensite have l…
We have studied the dark conductivity (field, temperature, and frequency dependence), and the photoconductivity in undoped polycrystalline diamond films. Detailed analysis reveals that either of two alternative models can be invoked to explain all the observed features of the dark conductivity. The first model is a Hi…
Magnesium-yttrium (Mg-Y) alloys containing 7 at% to 26 at% solute were fabricated using magnetron cosputter deposition. X-ray diffraction (XRD) revealed that no second phases were present in any of the alloys and that all but two of the alloys (Mg-7% Y and Mg-14% Y) were nanocrystalline and/or amorphous. Anodic potent…
An enhanced supersonic carbon source produces carbon atoms in their C(3Pj) electronic ground states via laser ablation of graphite at 266 nm. The 30 Hz (40±2) mJ output of a Nd-YAG laser is focused onto a rotating graphite rod with a 1000 mm focal length UV-grade fused silica plano-convex lens to a spot of (0.5±0.05)…
The development of positive temperature coefficient of resistance (PTCR) behavior during the firing procedure of semiconducting BaTiO 3 was characterized. The PTCR properties of BaTiO 3 were shown to be sensitive to the material's microstructure, liquid‐phase distribution, and extent of grain‐boundary oxidation. The P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoluminescence of Tris(2,2'-bipyridine)ruthenium(II) Ions Intercalated in Layered Niobates and Titanates: Effect of Interlayer Structure on Host-Guest and Guest-Guest InteractionsTeruyuki Nakato, Kazuhiko Kusunoki, Katsuaki Yoshizawa, Kazuyuki Kuroda, and Masao KanekoCite…
An electrochemical process aiming at the grafting of methoxy groups on the hydrogenated porous silicon surface at room temperature has been designed. This takes place through partial anodic dissolution of porous silicon in anhydrous methanol. A dissolution mechanism is proposed by analogy with that of the anodic disso…
A model is proposed that qualitatively explains a variety of experiments on light-induced optical anisotropies in chalcogenide glasses and amorphous films. The model accounts for the sign of the observed anisotropies in thin films and predicts that even unpolarized light will cause these materials to become optically…