Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInterfacial Phenomena in Macromolecular Systems. II. Relaxation Modulus of Uncrosslinked Silica-Polydimethylsilosane CompositesR. S. Chahal and L. E. St. PierreCite this: Macromolecules 1969, 2, 2, 193–197Publication Date (Print):March 1, 1969Publication History Published on…
A precise X-ray determination of the lattice constants of ruthenium dioxide, RuO2, has been made in the temperature range 30° to 702°C using a Unicam 19 cm high-temperature powder camera. It has been observed that the c parameter decreases with increasing temperature as in the case of FeF2 and CrO2 which also have a r…
The detection and location of discharges in rotating- machine high-voltage windings is useful in directing attention to abnormalities in the insulation structure which can lead to premature failure of the winding. In order to achieve a practically useful test it is necessary to distinguish between conditions involving…
"The Corrosion and Oxidation of Metals: First Supplementary Volume." British Corrosion Journal, 4(2), p. 52
Previous measurements of the birefringence of sapphire and magnesium fluoride have been extended to their respective limits of transparency, revealing anomalous dispersion effects at short wavelengths, which are qualitatively discussed. Possible practical applications to Lyot filters and quarter-wave plates for Lyman-…
SUMMARY Lithification caused by inorganic precipitation of high‐Mg calcite is reported from several localities in the Mediterranean. A micritic calcite cement with 13–15 mol. % MgCO 3 in solid solution lithifies internal sediments and forms open‐space fillings within a sublittoral algal framework down to 20 m, in whic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelf-diffusion of oxygen in magnetite. Effect of anion vacancy concentration and cation distributionJames E. Castle and P. L. SurmanCite this: J. Phys. Chem. 1969, 73, 3, 632–634Publication Date (Print):March 1, 1969Publication History Published online1 May 2002Published ini…
The field ionization of water is observed utilizing a mass spectrometer. The existence of H4O+ is confirmed. The energy distributions of the ions are investigated. Under certain conditions the energy distributions form two peaks. The appearance potentials of the polymers H3O+·nH2O, n = 0, 1, 2, 3, are determined. A mo…
The superlattice and domain structures exhibited by the ordered compound V6C5 are disrupted by electron microscope beam bombardment. The effect is attributed to the disordering of the carbon sublattice that results from displacement of the carbon atoms by the impinging electrons. Studies have been made of the disorder…
Abstract An x‐ray study of poly( N ‐butyl isocyanate) (PBIC) was undertaken with the aim of providing the structural information required for the calculation of its ultraviolet absorption spectrum. Well defined diffraction patterns are obtained from powder samples and oriented films of the polymer cast from cyclohexan…
The conditions under which a given form of any of the three distinct polymorphic crystalline phases of isotactic polypropylene can be obtained have been investigated. The relationship between crystallization conditions and the formation of a given crystalline phase is discussed. Evidence is cited in support of the hyp…
The consequences of a simple type of exchange interaction between charge carriers in a broad energy band and localized magnetic moments will be discussed for a ferromagnetic semiconductor. The interaction causes (1) a splitting of the energy band into two bands for the different spin directions, (2) spin disorder scat…
A general theory is developed to account for the mobility of a dislocation which is sessile in its low-energy form. It is shown that three distinct mechanisms for movement are possible, each controlling the mobility over a different stress range. A specific core model is used to derive an expression for the mobility o…
The antiferromagnetic perovskites have a simple cubic-magnetic structure with nearest-neighbor exchange interactions only. The perfect-crystal Green functions can be easily expressed in terms of tabulated integrals, so that they are particularly suitable for making quantitative comparison between theory and experiment…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCellulose Xanthic Acid. I. Studies of Model SystemsJohn Dyer and Lyle H. PhiferCite this: Macromolecules 1969, 2, 2, 111–117Publication Date (Print):March 1, 1969Publication History Published online1 May 2002Published inissue 1 March 1969https://pubs.acs.org/doi/10.1021/ma60…
Abstract Monocrystals of calcium tartrate tetrahydrate, neodymium‐doped calcium tartrate tetrahydrate, and cuprous chloride have been grown by controlled diffusion in silica gel using both metathetical and decomplexation reactions. Conditions for the optimum growth of the crystals are given and it is shown how the p H…
I. Single crystals of Alnico V and Alnico VIII alloys with 35, 40, and 42 wt.% Co and 5, 7, and 8 wt.% Ti, respectively, were investigated by x-ray analysis and electron microscopy of thin foils. It was found: (1) In Alnico V, alloy decomposition begins with the formation of randomly arranged equiaxial spherical zones…
The crystal structure of gratonite has been redetermined with the use of three-dimensional intensity data. The intensities were obtained by counter and photographic technique. Three chemical units of Pb 9 As 4 S 15 are contained in the unit cell of the symmetry C 3 v 5 – R 3 m with a hex = 17.758 ± 0.014 Å, c hex = 7.…
The numerical method of deconvolution described in part I is applied to a study of a broadening factor of the diffractometer: the receiving slit. By considering this factor the validity of this direct method of deconvolution, which can also be applied to analytical profiles and to experimental profiles, is verified. T…
It is proposed that silicate glasses be classified in terms of substructures uniquely identified with primary crystallization phases. All glasses having compositions within the ranges or areas covered by a given primary crystallization phase field should constitute a separate glass type or class. This classification i…