Materials Literature
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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…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal Morphology and Phase Identification in Poly(Aryl Ether Ketone)s and Their Copolymers. 4. Morphological Observations in PEKK with All p-Phenylene LinkagesRong-Ming Ho, Stephen Z. D. Cheng, Benjamin S. Hsiao, and Kenncorwin H. GardnerCite this: Macromolecules 1995, 28,…
Article A Vacancy/Dislocation Interaction Mechanism of Transgranular Stress Corrosion Cracking was published on December 1, 1995 in the journal Journal of the Mechanical Behavior of Materials (volume 6, issue 1).
The optical properties of ABCl3:Mn2+ crystals are investigated in the 300–10 K temperature range. The variation of the peak energy and the Stokes shift along the series are explained in terms of slight differences in the Mn–Cl distance. The local structure around the Mn is determined by correlating optical spectroscop…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, Structure, and Properties of a Novel Metallic Nickel(III) Oxide in the Ce2-xSrxNiO4-.delta. System: CeSr7Ni4O15M. James and J. P. AttfieldCite this: Chem. Mater. 1995, 7, 12, 2338–2341Publication Date (Print):December 1, 1995Publication History Published online1 M…
Abstract Chitin–cellulose blends dissolved in dimethylacetamide containing LiCl (7% w/w) have been studied in a wide concentration range, from very dilute solutions to medium concentrations and up to solid films (absence of diluent). The intrinsic viscosities at various chitin–cellulose ratios, as well as the phase di…
Time-of-flight (TOF) distributions of CO 2 molecules desorbing after the oxidation of CO on Pt (111) were investigated at various desorption angles ϑ for surface temperatures T s in the range 550–800 K. The Pt (111) surface was exposed to a continuous flow of O 2 from a doser and to a chopped CO nozzle beam. Surface r…
Abstract Electron spin lattice relaxation rates were measured by saturation recovery for three oxo(5,10,15,20‐tetratolylporphyrinato)molybdenum(V) complexes, OMo(TTP)X, X=Cl − , OH − , OEt − . For O=Mo(TTP)(OEt) in glassy solution between 15 and 130 K the temperature dependence of 1/ T 1 is consistent with a two‐phot…
Simple analytic expressions for all six Leslie viscosities for nematics are obtained from the molecular theory for rigid prolate molecules. The theory relates the viscosities to the second and fourth moments, P 2 and P 4, of the molecular distribution function, the aspect ratio a of the molecules, and an isotropic vis…