Materials Literature
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The results of photoluminescence (PL) and electroluminescence (EL) studies from partially oxidized porous silicon (POPS) layers are presented. The PL from POPS is stable, peaks at 600-570 nm and its temperature dependence can be fitted by an exponential law with an activation energy Ea ≈ 10 meV. The current-voltage ch…
Differential scanning calorimetry has been used to make direct measurements of the excess enthalpy of TiO 2 (rutile) with an initial grain size of 30–70 nm. When the heat released during grain growth is normalized to the change in grain boundary area, the specific excess enthalpy at low temperatures and fine grain siz…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynchrotron-Based Method for the Study of Crystallization: Templated Formation of CoALPO-5 CatalystFernando Rey, Gopinathan Sankar, John Meurig Thomas, Phillip A. Barrett, Dewi W. Lewis, C. Richard A. Catlow, Simon M. Clark, and G. Neville GreavesCite this: Chem. Mater. 1995…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlternating Lamellar Structure of Triblock Copolymers of the ABA TypeY. Matsushita, M. Nomura, J. Watanabe, Y. Mogi, I. Noda, and M. ImaiCite this: Macromolecules 1995, 28, 18, 6007–6013Publication Date (Print):August 1, 1995Publication History Published online1 May 2002Publ…
Polycrystalline yttrium aluminum garnet (YAG) fibers were prepared from commercially available colloidal sols of Y 2 O 3 and AlOOH and water‐soluble polymers. The fibers were dry spun and all processing was performed in air. Transformation to YAG was complete by ≅1300°C, and the fibers were mostly dense by 1600°C with…
The synthesis, solid-state structure and magnetic characterization of KFe3(OMe)7(dbm)3·4MeOH (I; Hdbm = dibenzoylmethane) are reported. I readily assembles in methanolic solns. of Fe(III) chloride and Hdbm in the presence of an excess of K methoxide; it crystallizes in the triclinic space group P-1 with a = 13.044(1),…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron-transfer boat-vibration mechanism for superconductivity in organic molecules based on BEDT-TTFErsan Demiralp, Siddharth Dasgupta, and William A. Goddard IIICite this: J. Am. Chem. Soc. 1995, 117, 31, 8154–8158Publication Date (Print):August 1, 1995Publication Histor…
Optical reflectivity of free-standing films at the smectic-A--nematic (Sm-A--N) phase transition has been studied. The Sm-A films thin in a stepwise manner in the nematic temperature interval. The film thickness can be described by a power function of maximal temperature at which this thickness is stable. The value of…
Polyaniline (PANI) films deposited galvanostatically on gold electrodes precoated with self-assembled monolayers of p-aminothiophenol (PATP) exhibit significantly higher optical densities than similar polymer films deposited on bare gold, as measured by in situ ellipsometry. At the same time there is no change in the…
The structure of molten silicon has been determined at three temperatures of 1440, 1460 and 1520° C by X-ray diffraction. All structure factors indicate a characteristic small hump on the higher wave vector side of the first peak and such specific feature becomes slightly obscure as the temperature increases. A small…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Synthesis and Properties of Face-to-Face Metallocene PolymersMyron Rosenblum, Helen M. Nugent, K.-S. Jang, M. M. Labes, W. Cahalane, Philip Klemarczyk, and William M. ReiffCite this: Macromolecules 1995, 28, 18, 6330–6342Publication Date (Print):August 1, 1995Publication…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTervalent-Metal Porphyrin-Phthalocyanine Heteroleptic Sandwich-Type Complexes. Synthesis, Structure, and Spectroscopic Characterization of Their Neutral, Singly-Oxidized, and Singly-Reduced StatesD. Chabach, M. Tahiri, A. De Cian, J. Fischer, R. Weiss, and M. El Malouli Bibo…
We present experimental results of a version of the Choppertron microwave generator designed to work with the high emittance beam of the Advanced Test Accelerator (ATA). Simulations showed that a 800-A, 120 {pi} cm-mrad beam (typical of ATA), could produce 800 MW of rf (11.4 GHz) power using two 12-cell, traveling-wav…
During tensile creep of a hot isostatically pressed (HIPed) silicon nitride, the volume fraction of cavities increases linearly with strain; these cavities produce nearly all of the measured strain. In contrast, compressive creep in the same stress and temperature range produces very little cavitation. A stress expone…
The variation of intensity of the photostimulated luminescence (PSL) of BaFCl:Eu2+ after ultraviolet irradiation with temperature has been investigated. The results show that the PSL intensity is independent of temperature in the readout process, but the storage ability is temperature dependent. The measurements suppo…
Abstract A crystal structure is usually described as the union of sets of symmetrically equivalent atoms, i.e. as the union of orbits. During a continuous or nearly continuous phase transition, symmetrically equivalent atoms of a crystal structure may become inequivalent, their site symmetries may be reduced, or both…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhenolics of Picnomon acarnaGregory G. Laskaris, Dimitris C. Gournelis, and Eugene KokkalouCite this: J. Nat. Prod. 1995, 58, 8, 1248–1250Publication Date (Print):August 1, 1995Publication History Published online1 July 2004Published inissue 1 August 1995https://doi.org/10.1…
Croconic acid, H 2 C 5 O 5 , is readily oxidized. This may be attested by decolorization of the solutions and by observation of oxalic acid complexes. The oxidation products are identified by 13 C NMR spectroscopy as oxalic and mesoxalic acids, and experimental conditions are specified. The oxidation process requires…
The crystallization and fractal formation in a-Ge/Au have been studied by in situ TEM and HREM. It was demonstrated that both the crystallization and the fractal formation depend on the continuity of the Au underlayer and the thickness of the a-Ge layer. As the Au film changed from semicontinuous to discontinuous, the…
Abstract Morphological aspects of the evolution of a gas ‐ solid interface during typical CVD processes are presented, as well as a continuum model of CVD growth. A linear stability analysis used determines the effect of reactor conditions on the stability of planar growth. The main focus, however, is numerical soluti…