Materials Literature
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X-ray diffraction photographs of protein single crystals have been obtained using synchrotron radiation produced by an electron-positron storage ring. The diffracted intensities observed with this unconventional source are a factor of at least 60 greater than those obtained with a sealed x-ray tube using the same crys…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHard Block Length Distribution in Segmented Block CopolymersL. H. Peebles Jr.Cite this: Macromolecules 1976, 9, 1, 58–61Publication Date (Print):January 1, 1976Publication History Published online1 May 2002Published inissue 1 January 1976https://pubs.acs.org/doi/10.1021/ma60…
The α—β transition in the cristobalite phases of SiO2 and AlPO4 has been studied using X-ray powder diffraction. The transitions show marked hysteresis but also occur over a range of about 20°C in which the α and β phases coexist. The lattice parameters show a smooth and slow variation with temperature for each phase…
The Stokes’ flow problem is considered for micropolar fluids in which the obstacle has an axis of symmetry, and the flow at distant points is uniform and parallel to this axis. A general expression for the drag is derived by using the arguments involving an axisymmetric point force and application is illustrated for t…
The strength of BaTiO 3 which had been hot‐pressed to ∼99% of theoretical density and tested above the Curie temperature was—9000 psi greater than at room temperature. This measured difference in strength is attributed to internal stress from the cubic→tetragonal phase transformation. Correction of measured strength t…
Abstract —Direct photooxidation of cyanine dyes was found to be markedly enhanced by formation of hypsochromically shifted (H) aggregates. Singlet oxygen was found to attack many cyanines possessing low oxidation potentials with rate constants in excess of 10 8 t mol ‐1 s ‐1 . Singlet oxygen attack on 3,3′‐diethyl‐8,1…
Phase equi ibria in the system MgO‐MgC 2 ‐H 2 O at 2°±3°C were determined and the reactions by which the equi ibrium phases, 5Mg(OH) 2 MgC 2 8H 2 O and 3Mg(OH) 2 MgC 2 8H 2 O, deve op were studied by X‐ray diffractometry. As reactive MgO is disso ved by magnesium ch oride so utions, a thixotropic suspension is convert…
Dianin's compound, suitably agitated, has been shown to sorb freely Ar, Kr, Xe, CO2, CH4, C2H6, C3H8, n-C4H10, iso-C4H10, and neo-C5H12, and behaves in some respects like an organic zeolite; the numbers of molecules filling each cavity in the host lattice varied from 6 for Ar (–196 °C) and CH4(–183°C) to 2 for iso-C4H…
Thermodynamical properties of an order-disorder model of ferroelectrics proposed by Comes, Lambert, and Guinier for the perovskites BaTi${\mathrm{O}}_{3}$ and KNb${\mathrm{O}}_{3}$, are discussed. It is shown that in the absence of crystalline distortion induced by the motion of the tunneling ion, the only stable orde…
We have measured as functions of temperature the refractive indices and linear birefringence of seven homologous compounds of p, [pacute]-di-n-alkoxy-azoxybenzenes in the nematic phase. Using the Vuks' model of local-field correction, we have deduced from our results both the microscopic and the macroscopic order para…
Corrosion of a 20Na2O‐10CaO‐70SiO 2 (mol%) glass by water was investigated using ir reflection spectroscopy, solution analysis, electron microprobe, and Auger electron spectroscopy. Corrosion proceeds at a much slower rate in the ternary glass than in a 20Na2O‐80SiO2 glass. Within the Na‐depleted layer of the ternary…
The theory of characteristic electron energy losses is discussed in terms of the electronic band structure of a solid. The relationship between the observed plasmon energies, the average interband energy gap and the background dielectric constant of the solid is developed. The transmission energy loss spectra of a num…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSome Results on the Description of Size Reduction as a Rate Process in Various MillsL. Austin, K. Shoji, V. Bhatia, V. Jindal, K. Savage, and R. KlimpelCite this: Ind. Eng. Chem. Process Des. Dev. 1976, 15, 1, 187–196Publication Date (Print):January 1, 1976Publication Histor…
A classification of the octahedral tilt systems in perovskites is given, based on the work of Glazer1 but extending it and using a new notation; this leads to a simple description of the sequences of phase transitions, and shows how they are related to the soft modes M3 and R25. Examples from the literature are discus…
[in Japanese]
Equations of state and transport data for the hard-sphere fluid suggest a quasi-thermodynamic transition from supercooled fluid to amorphous solid at a density slightly greater than the equilibrium freezing density. This has been substantiated with a lengthy MD computation in which the density was increased very gradu…
In a previous paper1 we described the magnetoelectiic effect in Co ferrite-Ba titanate unidirectionally solidified eutectic, which can reach a conversion factor (α factor = 4π(dP/dH) 200 times higher than that of the best single-phase material at room temperature, Cr2O3. We subsequently developed sintered composites w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of counterion substitution on the type and nature of nematic lyotropic phases from nuclear magnetic resonance studiesK. Radley, L. W. Reeves, and A. S. TraceyCite this: J. Phys. Chem. 1976, 80, 2, 174–182Publication Date (Print):January 1, 1976Publication History Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructures of zinc octaethyl formylbiliverdinate hydrate and its dehydrated bis-helical dimerG. Struckmeier, U. Thewalt, and J. H. FuhrhopCite this: J. Am. Chem. Soc. 1976, 98, 1, 278–279Publication Date (Print):January 1, 1976Publication History Published online1 May 2002Pu…
Molecular-orbital calculations on [Au6]2+ and [Aug9]3+ clusters have shown that the overlap of the gold 6s orbitals makes a dominant contribution to the bonding. Co-ordination of ligands to these ‘ bare ’ metal clusters encourages a more favourable hybridisation of the metal orbitals and results in stronger radial met…