Materials Literature
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Abstract The rates of calcination of two types of limestones, ranging in particle size from 1 to 90 μm, were measured over the temperature range 516 to 1,000°C. A kinetic model based on the B.E.T. (Brunauer‐Emmett‐Teller method) surface area of the CaCO 3 correlates the results over 5 orders of magnitude in reaction r…
The present status of our understanding of the diffusion of hydrogen in metals, both experimental and theoretical, is reviewed. Discussions are focused on the mechanism of diffusion of hydrogen isotopes H, D and T in f.c.c. and b.c.c. metals; the positive muon (μ +) is referred to where appropriate. An up-to-date comp…
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolubility and properties of a poly(aryl ether ketone) in strong acidsMatthew T. Bishop, Frank E. Karasz, Paul S. Russo, and Kenneth H. LangleyCite this: Macromolecules 1985, 18, 1, 86–93Publication Date (Print):January 1, 1985Publication History Published online1 May 2002Pu…
The high‐temperature structure of zirconia was studied by powder neutron diffraction up to 2400°C. The boundaries of the domain of the nonstoichiometric tetragonal form are defined. They are consistent with a tetragonal‐cubic transition at 2350°C for stoichiometric zirconia. The changes in the structural parameters of…
Abstract Conventional thinking has long held that the abiotic precipitation of calcium carbonate occurs with a causal relationship between fluid My/Ca ratios and crystal morphology, crystal composition, and carbonate mineralogy, resulting in the formation of meteoric, equant, low-magnesium calcite and marine, acicular…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProperties of polyether-polyurethane block copolymers: effects of hard segment length distributionJohn A. Miller, Shaow B. Lin, Kirk K. S. Hwang, K. S. Wu, P. E. Gibson, and Stuart L. CooperCite this: Macromolecules 1985, 18, 1, 32–44Publication Date (Print):January 1, 1985P…
Very small ZnS and CdS crystallites are made and stabilized in aqueous and methanolic media without organic surfactants. Low temperature (−77 °C) synthesis in methanol produces the smallest crystallites, ≈30 Å diameter cubic CdS and <20 Å diameter cubic ZnS. The crystallites are characterized by transmission el…
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The natural radioactivity due to the presence of 226Ra, 232Th and 40K in conventional raw materials and some solid industrial wastes and by-products which are being used or have a potential for use in the building and ceramic industries in Australia has been measured by gamma-ray spectrometry. The majority of material…
List of Symbols.Introduction.Atomic Structure and Interatomic Bonding.The Structure of Crystalline Solids.Imperfections in Solids.Diffusion.Mechanical Properties of Metals.Dislocations and Strengthening Mechanisms.Failure.Phase Diagrams.Phase Transformations in Metals: Development of Microstructure and Alteration of M…
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Optical and mechanical properties of aluminum oxynitride (ALON) and magnesium aluminate spinel (MgA1<sub>2</sub>0<sub>4</sub>) are presented as well as some optical properties of spinel and ALON hemispherical domes. These materials are transparent in the visible and mid IR and are durable polycrystalline ceramics.
A new technique is described for direct measurement of mass changes of a conducting polymer electrode during electrochemical cycling. A quartz microbalance is used, with one of its contacts serving as the working electrode. Its high sensitivity permits resolution of mass changes less than 100 ng/${\mathrm{cm}}^{2}$. T…
A quasicrystal is the natural extension of the notion of a crystal to structures with quasiperiodic, rather than periodic, translational order. We classify two- and three-dimensional quasicrystals by their symmetry under rotation and show that many disallowed crystal symmetries are allowed quasicrystal symmetries. We…
The thermal conductivity of polyacetylene has been measured in the temperature range of 0.8 to 300 K. For T&lt;70 K we present also data of AsF5-doped samples and of doped samples which have been compensated with (CH3)2NH into the insulating state. The undoped sample shows a T2-temperature dependence up to 12 K fo…
The EPR spectrum at 9.1 GHz of the M=1/2↔-1/2 transition for Mn2+ in polycrystalline dolomite has been studied using a detailed computer simulation of the line shapes in the powder pattern spectrum. The accuracy of the analytical procedure was verified for the spectrum of Mn2+ in calcite, yielding magnetic constants w…
Methods of the Delaunay and Voronoi tessellation are applied to investigate significant structures and structural differences among liquids, glasses, and crystals of the soft-core (inverse 12th power potential) and hard-core models for which molecular dynamics (MD) techniques are used. With particle configurations obt…
The interfacial tension γeq between nematic and isotropic phases of some cyanobiphenyls has been measured by using the sessile drop method. Values of γeq ranging from 0.7×10−2 to 1.8×10−2 erg/cm2 are obtained. In a recent paper we measured the optical reflectivity coefficients at the nematic–isotropic interface of 7CB…
A review of experimental data on the time dependence of luminescent decay in solids shows very few examples of the classically expected exponential dependence and none of the bimolecular law. The prevailing long-term time dependence obeys power laws in time with exponents between -1 and -2. It is suggested that the wi…