Materials Literature
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Tetragonal zirconia polycrystals were produced from high‐purity powders containing 1.5 to 5.0 mol% Y 2 O 3 by cold isostatic pressing and sintering, hot‐pressing, and hot isostatic pressing. The mechanical properties and microstructures of these resulting materials were examined, with emphasis on the relation between…
A tight-binding model in one dimension with an incommensurate potential ${V}_{n}=\ensuremath{\lambda}cos(2\ensuremath{\pi}\ensuremath{\sigma}n)$ is investigated. It is found that at the critical point of the localization transition $\ensuremath{\lambda}=2$, there is a finite range of scaling indices ${\ensuremath{\alp…
This is the first comprehensive check-list of the diatoms of the British Isles to cover all currently reported taxa from freshwater, brackish and marine habitats. It contains a classification of the genera in order of families, followed by a complete list of species and lower taxa set out in alphabetical order within…
We present experimental results on the viscosity of supercooled aqueous solutions of lithium chloride. The viscosity scales as (T-${T}_{0}$${)}^{\ensuremath{\mu}}$ with \ensuremath{\mu}=-2.08 over a large temperature range. Data on other systems show that both the power-law behavior and the approximate value of the ex…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDilation of polymers by sorption of carbon dioxide at elevated pressures. 1. Silicone rubber and unconditioned polycarbonateG. K. Fleming and W. J. KorosCite this: Macromolecules 1986, 19, 8, 2285–2291Publication Date (Print):August 1, 1986Publication History Published onlin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrdered bicontinuous double-diamond structure of star block copolymers: a new equilibrium microdomain morphologyEdwin L. Thomas, David B. Alward, David J. Kinning, David C. Martin, Dale L. Handlin Jr., and Lewis J. FettersCite this: Macromolecules 1986, 19, 8, 2197–2202Publi…
We have measured the frequency-dependent specific heat of glycerol and propylene glycol near the glass transition. The measurements, covering a frequency range of five decades, probe the linear response of these supercooled liquids to small perturbations from equilibrium. The specific heat of these two liquids contain…
Metallic conductivity that increases continuously up to 1.3 K and achieves values of over 500000 S cm−1 is exhibited by single crystals of the radical-anion salt depicted here, which was prepared by electrocrystallization. The multidimensional electronic conductivity is discussed on the basis of the crystal structure.…
Abstract High–quality Raman spectra of orthorhombic sulfur (S 8 ) have been recorded at 40 K employing multiscanning conditions. Assignments are proposed for the many new features detected, especially binary and ternary overtones and combinations of the SS stretching and SSS bending vibrations. The anharmonicities…
Gallium is a metal that literally melts in your hand. It has low toxicity, near-zero vapor pressure, and a viscosity similar to water. Despite possessing a surface tension larger than any other liquid (near room temperature), gallium can form nonspherical ...Read More
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface-enhanced Raman spectroscopy of amino acids and nucleotide bases adsorbed on silverJ. S. Suh and M. MoskovitsCite this: J. Am. Chem. Soc. 1986, 108, 16, 4711–4718Publication Date (Print):August 1, 1986Publication History Published online1 May 2002Published inissue 1 A…
A detailed experimental study has been made to clarify the mechanism of impulsive pressure generation from a single bubble collapsing in a static fluid – this is the most essential and important research task concerned with cavitation damage. First, the general feature of impulsive pressure generation is discussed, an…
The different magnetic phases of the bcc and fcc forms of Fe, Co, and Ni are studied by analyzing total-energy surfaces in moment-volume parameter space obtained from energy-band calculations using a local-spin-density approximation. The surfaces, found by calculating total energies while holding both the magnetic mom…
The 31P NMR spectra of 15N-labelled cyclophosphazenes contain additional information compared with the unlabelled compounds, namely, apart from the spin–spin coupling constant JPN, it is also possible to obtain information, in the case of homosubstituted compounds, about the spin–spin coupling constants JPP and JNN. T…
Abstract High-level wastes (HLW) can be incorporated in the crystal lattices of coexisting phases in ceramic waste forms. The properties and performances of ceramic waste forms are largely determined by their phase chemistry, phase assemblage and microstructure. Currently, the best categorized advanced ceramic waste f…
Abstract The title compound 1 , {[Fe(H 2 pztc)(H 2 O) 2 ] · 2 H 2 O} ∞ , has been prepared from pyrazinetetracarboxylic acid (H 4 pztc) and Fe(II) salt in H 2 O. It crystallizes in the monoclinic space group P 2 1 / a with cell parameters a = 13.56(1) Å, b = 7.17(1) Å, c = 6.48(1) Å, β = 101.0(2)°, V = 618.4 Å 3 . The…
Abstract A new, accurate, low‐temperature X‐ray analysis of lithium tetrafluoroberyllate, Li 2 BeF 4 , reveals that the charge density in this crystal is better represented as a superposition of spherical neutral‐atom charge distributions than as a superposition of ionic charges. The two distributions are so similar t…
Photoinduced crystallization is investigated by Raman scattering in Ge${\mathrm{Se}}_{2}$ and Si${\mathrm{Se}}_{2}$ glasses. Crystallization into two different structures is observed according as the incident laser power is above or below the threshold. To interpret it a new stochastic random-network model composed of…
We adopt the view that the structure of disordered systems is itself determined by the formation energy of structural deviations from an ideally bonded network. By developing an equilibrium statistical mechanical model for disorder we predict properties of electronic band tails, defects, defect densities of states, an…
A theory is presented in which much of the structure of spiral galaxies arises from a percolation phase transition that underlies the phenomenon of propagating star formation. According to this view, the appearance of spiral arms is a consequence of the differential rotation of the galaxy and the characteristic diverg…