Materials Literature
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The results of the mode coupling theory (MCT) for the slow relaxation processes in a liquid of hard spheres close to the liquid to glass transition are discussed. It is also shown that the MCT makes quantitative statements about the glassy structure, the relaxation processes in an intermediate time window and the fina…
The ligand 4-Cl-2,6-bis(benzimidazol-2′-yl)-pyridine(Cl-bzimpy;H2L) acts as a bidentate when coordinated with transition metal ions and the complex [Fe(Cl-bzimpy)2](ClO4)2 was isolated as a solid. The protonation constants (logK). The free ligand and the complex were evaluated in 30:70 (v/v) H2O:EtOH at room temperatu…
We present a theoretical investigation of the band lineups between crystalline and amorphous silicon, based on the first-principles pseudopotential method and the model-solid theory. We find that the offsets are very sensitive to the hydrogen content of the material; the valence-band offset for a junction with unhydro…
Biological structures have evolved to fit their purpose and a discussion is given of the materials and engineering reasons for their success. The contrast is made between traditional engineering's extraction of maximum benefit from choice of materials and Nature's extraction of maximum benefit from structural shapes m…
Silicon carbide (SiC) fibers were synthesized by the pyrolysis of radiation‐cured polycarbosilane (PCS) fibers. The pyrolytic reaction was analyzed through free radicals by electron spin resonance (ESR). Free radicals on Si and C atoms were produced in the pyrolysis, and their yield as a function of reaction temperatu…
We have deposited ZnO:Al films with state-of-the-art electro-optical properties by reactive magnetron sputtering from a zinc target. Films with resistivities of 5×10−4 Ω cm, good optical properties over the visible and near infrared, and with good uniformity are routinely produced. Resistivities down to 1.7×10−4 Ω cm…
Temperature dependence of outgassing was measured for differently surface treated type 316L stainless steel chambers in the temperature range of 25–330 °C. Based on the temperature dependence and outgassing characteristics of major outgassing species, the mechanism of outgassing from the stainless steel surface is dis…
An algorithm is described for the computation of the saturation characteristics of three-phase delta-connected transformers from measured V/sub rms/-I/sub rms/ curves and no-load losses at rated frequency. For these transformers, positive sequence excitation tests are usually carried out with the delta connection clos…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUnusual Interaction of Ag+ with an Organopalladium Crown Ether. Synthesis and Structures of [PdCl(L)] and [Pd(H2O)(L)(Ag)][CF3SO3]2 (L = 5,8,11-Trioxa-2,14-dithia-[15]-m-cyclophane)James E. Kickham and Stephen J. LoebCite this: Organometallics 1995, 14, 7, 3584–3587Publicati…
Abstract The structure of Al 13− x (Co 1− y Ni y ) 4 , with x = 0.9 and y = 0.12, a new monoclinic approximant of the decagonal phase in the system Al–Co–Ni, was determined by means of single-crystal X-ray diffractometry: space group C 2/ m (No. 12), a = 17.071(2) Å, b = 4.0993(6) Å, c = 7.4910(9) Å, β = 116.17(1)°, V…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of plasma modification conditions on surface restructuringRonald C. Chatelier, Ximing Xie, Thomas R. Gengenbach, and Hans J. GriesserCite this: Langmuir 1995, 11, 7, 2585–2591Publication Date (Print):July 1, 1995Publication History Published online1 May 2002Published…
Summary This paper discusses a novel design for a rotary differential NiTi shape memory alloy actuator, which incorporates a mobile heat sink. The new mechanism is described in detail, and its performance in a position control system is compared with that of the same actuator without heat sink. Experimental results ar…
The finite-size analog of the Walgraef—Aifantis (WA) model of the “reaction + diffusion” type has been proposed to explain the size effects of dislocation patterning in fatigued metals. It has been demonstrated that the formation of certain patterns can be understood as a result of competition between the intrinsic le…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnergy Transfer Quenching of Porous Si Photoluminescence by Aromatic MoleculesDiana L. Fisher, Jessica Harper, and Michael J. SailorCite this: J. Am. Chem. Soc. 1995, 117, 29, 7846–7847Publication Date (Print):July 1, 1995Publication History Published online1 May 2002Publish…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSr2LiSiO4F: Synthesis, Structure, and Eu2+ LuminescenceAnnapoorna Akella and Douglas A. KeszlerCite this: Chem. Mater. 1995, 7, 7, 1299–1302Publication Date (Print):July 1, 1995Publication History Published online1 May 2002Published inissue 1 July 1995https://pubs.acs.org/do…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Role of Anion in the Preparation of Nickel Catalyst Detected by TPR and FTIR SpectraSheng-Chung Ho and Tse-Chuan ChouCite this: Ind. Eng. Chem. Res. 1995, 34, 7, 2279–2284Publication Date (Print):July 1, 1995Publication History Published online1 May 2002Published inissue…
Cosublimation of 1,3- and 1,4-benzene-bis(1,2,3,5-dithiadiazolyl) and iodine/bromine affords crystals of the mixed valence salts 1,3- and 1,4-[(S2N2C)C6H4(CN2S2)][X] (X = I, Br). The crystal structures of the two iodide salts consist of perfectly superimposed stacks of molecular units with interannular spacing along t…
The different routes for the synthesis of aluminum nitride (AIN) powders are reviewed: the different industrial techniques from both the direct nitridation of aluminum metal and the carbothermal nitridation of alumina, and also other synthesis routes not industrially developed up to now. This paper presents a comprehe…
In this paper, piezoelectric properties of (Bi1/2Na1/2)1–x (Sr1/2Ca1/2) x TiO3 system were studied from the viewpoint of lead-free piezoelectric materials. To improve electromechanical properties in this system, MnO was added to this system. In the composition of x = 0.13 which was close to morphotropic phase boundary…
The operative damage mechanisms in a series of C‐matrix composites loaded in tension and shear have been investigated. The composites contained either C fibers or Nicalon fibers, both with and without a carbon coating. The matrix consisted primarily of ex‐phenolic carbon with a final carbon layer introduced by chemica…