Materials Literature
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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…
The detailed structure of porous Si (PS) layers formed in p-type wafers with resistivities 0.01-25 Omega cm has been investigated using reflectance, transmission, ellipsometry and photoluminescence techniques. Marked differences were observed in the optical properties of PS formed in degenerate or non-degenerate Si an…
It has been proposed that the sharp Raman lines seen in vitreous Si${\mathrm{O}}_{2}$ and other glasses are the signatures of highly regular rings of bonds connected into a more disordered network. We derive a condition for vibrational decoupling of the appropriate ring modes from the surrounding network, and thereby…
Experimental results are presented for the ionic conductivity of AgI1−xClx (0 < x < 0.1) in the temperature range 60 to 200 °C. It is found that the substitution of Cl− ions for I− ions in AgI leads to a substantial decrease in the temperature for β–α phase transition and also a large increase in the ionic conductivit…
A high resolution study of the defects in the 18R martensite of the Cu-Al alloys enables a detailed analysis of the basal plane stacking faults and two other particular types of nearly planar defects observed in martensite phases. One type of defect is parallel with the martensite habit plane, another type, more frequ…
Complex dielectric constants of KH 2 PO 4 single crystals along the a - and the c -axes have been measured in the temperature range from 2.5 K to 30 K at frequencies between 10 Hz and 20 kHz. Dielectric dispersions with small loss peaks are observed in both directions. The dispersion along the c -axis (dispersion C) i…
Factor group splittings, of common occurrence in the infrared and Raman spectra of crystals, and dispersion, usually encountered in discussions of lattice modes, are shown to be closely related phenomena. Their relationship is elucidated by a model comprising a linear array of four vibrating units. A correlation betwe…