Materials Literature
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Cation ordering in magnesium and nickel ferrites was studied by X-ray diffraction measurements carried out at the temperature of equilibration and also on quenched specimens. The order parameters on quenched specimens agreed with results previously reported by others but not with values measured at temperature. Previo…
One of the methods in use for measuring the kinetics of isothermal crystallization of polymers is the recording of the depolarization of plane-polarized light by a microscope specimen. A relation between this depolarization and the volume fraction crystallized has been derived taking into account the polycrystalline n…
In this study, previously derived relationships between critical anodic current density and chemical composition of Type 304 stainless steel were used to develop a new series of 18Cr-8Ni alloys with improved passivating properties. Electrochemical and corrosion tests confirm that these special Type 304 alloys have sup…
Abstract The diametrical crushing strength of an ideal system of compacted particulate material, and the relation between strength and mean compaction pressure depend on the time at which the strength is determined. Strength increases of over 100% during the first hour after compression are attributed to stress relief…
In the spectral range 0.5<hv<11.9 eV, reflectance data were obtained from molybdenum and ruthenium films, vapor deposited in ultra-high vacuum and extended to 14 eV using the reflectance of a polished bulk sample. The Mo data are different from previously reported data. The optical constants are obtained by a Kr…
The dc resistivity of nickel‐zinc ferrite was studied as a function of nickel/zinc ratio, apparent density, temperature, and grain size. Resistivities of Ni 0.40 Zn 0.51 Fe 1.90 O 4 – and Ni 0.35 Zn 0.65 ‐Fe 1.90 O 4 – are similar. Evaluation of samples sintered between 1100° and 1220°C showed that densification proce…
The absorption and magnetic circular dichroism (M.C.D.) spectrum of the IrBr6 2- ion at room and liquid helium temperature has been studied in the host crystals (NH4)2SnBr6, K2SnBr6 and (C2H5NH3)2SnBr6 in the region ∼11 000–21 000 cm-1. An interpretation of the spectrum is presented which differs significantly from th…
A unique method was developed for mechanical testing of brittle materials to create an unlimited number of stress ratios in the tension‐tension and tension‐compression quadrants. The stress states are achieved by internal and external pressurization of tubular specimens in a special pressure vessel. Failure envelopes…
Abstract Methods are described for estimating a valuable absorption coefficient for OH stretching bands of micas: the integrated parallel absorption coefficient K . From a correlation between this coefficient and the OH content of biotites and phlogopites, it was found that the parallel absorption coefficient per hydr…
Abstract The refractive index, density and viscosity of aqueous solutions of ammonium sulphate have been measured in the range 20‐30°. The solubility of ammonium sulphate was checked over the range 20‐45° by measuring saturation temperatures in a simple apparatus. The same technique was also used for nucleation studie…
The various methods of interpreting and using Kossel patterns to determine orientations and lattice constants are reviewed. Particular attention is given to the fully analytic methods for which computer programs can be written to perform the calculations. Some practical data and computation methods are appended.
Abstract A statistical analysis of dilute solution viscosity data for a wide range of polyethylene and polypropylene samples in Decalin at 135°C has shown that the Martin equation fits the experimental data better than the Huggins equation at higher values of [η] c . A grand average k of 0.139 is applicable to both po…
Investigations of the formation and magnetic properties of MnδCo1-δFe2O4formed in alkaline aqueous solution by the coprecipitation method are covered. The lattice constant of these ferrites apparently reduced with decreasing average particle size below about 500 Å. The coercive force ratio of MnFe2O4and Co-Fe2O4is 1 t…
The normal modes of an incompressible cholesteric liquid crystal are determined from the hydrodynamical equations. There are two important modes which should be readily observable by light scattering. The first mode is a twisting and untwisting of the helical structure. The second mode is a combination viscous-splay m…
Strain-gauge thermal expansion and anisotropy of susceptibility measurements indicate the existence of three phase transitions below 50°K in alpha uranium. Two of the transitions are of first order and one is of second order.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSorption of aqueous and nonaqueous media by wood and celluloseAnanthakrishnaiyer. VenkateswaranCite this: Chem. Rev. 1970, 70, 6, 619–637Publication Date (Print):December 1, 1970Publication History Published online1 May 2002Published inissue 1 December 1970https://pubs.acs.o…
The stress in thin films of chemical-vapor-deposited (CVD) glass on Si substrates was measured by the Newton-ring method. The CVD films studied were Silane-oxidized SiO2, phosphosilicate glass and borosilicate glass deposited at 400°–450°C. Stress reduction due to moisture absorption was observed in the CVD films, but…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReduction of complexes of pentaammineruthenium(III) with pyridine derivativesHenry Taube and R. G. GaunderCite this: Inorg. Chem. 1970, 9, 12, 2627–2639Publication Date (Print):December 1, 1970Publication History Published online1 May 2002Published inissue 1 December 1970htt…
A unique low energy (0–50 keV) electron accelerator has been developed which provides a broad, parallel, low intensity electron beam with excellent long term stability. The beam intensity is approximately 106 electrons·cm−2 ·sec−1 and the long term stability is better than 2%/day. A prototype of this accelerator is de…
Summary. Precipitation of calcium carbonate by marine isolates from Bahamian sediments was studied in several media and under different experimental conditions. Almost all cultures brought about precipitation of aragonite crystals. The role of bacteria in the precipitation of CaCO 3 in the marine environment is discus…