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The powder diffractogram of vanadium dioxide crystals was found to change, rapidly and reversibly, at about 70 deg C, the most obvious feature being the disappearance of all reflections hkl with h odd. At 180 deg C the effect was even greater and the crystal structure was derived and found to be essentially of the rut…
B. J. Hathaway, D. G. Holah and J. D. Postlethwaite, J. Chem. Soc., 1961, 3215 DOI: 10.1039/JR9610003215
The kinetics of collagen reprecipitation from solutions of salt-extracted calf dermis in the presence of small amounts of mucopolysaccharide and nucleic acids (0.005 per cent in the final reaction mixture) has been reported by Wood (1960). The present paper is a parallel study using the same materials, and describes t…
On employing a sectioning technique with Cr 51 as the tracer, the diffusion of Cr ions in nitrogen‐equilibrated was determined from 1045° to 1550°C. Volume diffusion coefficients in hot‐pressed compacts of three different impurity levels conform to the expression . Additions of and do not cause a significant change. U…
Values of the elastic constants of single crystals of the bcc transition elements V, Nb, and Ta, are reported at T=27°C. They are, in units of 1011 d/cm2: c11c12c44V22.811.94.26Nb24.613.42.87Ta26.716.18.25Comparisons are made of the values obtained for two crystals each of V and Ta. A high-frequency cw resonance techn…
The cation distributions in copper ferrite-chromite series and the copper ferrite quenched from high temperatures are measured by X-ray diffraction method. The lattice parameters are also measured as a function of chromium ion content and of temperature. The critical fractions of copper ions on 16d and 8a sites for th…
Abstract A simple procedure for the determination of the crystalline fraction in isotactic polypropylene, suitable for routine work, is described. It gives lower figures for the crystalline fraction than the method recommended by N ATTA , C ORRADINI , and C ESARI in 1957. The correctness of the results (within the lim…
Polymerization and the Characterization of Polymers.Preparation, Fabrication, and Characterization of Polymers.Advanced Processing.Polyamides, Ureas, Urethanes, and Other Amide--Linked Polymers.Polyesters, Polycarbonates, and Polyurethanes.High Temperature and High Performance Polymers.Solid Phase Polymerization.Ring-…
Tracer diffusion mechanism in a polycrystalline medium with a plane source is discussed by assuming both the high diffusivity along the grain boundaries as compared with that inside the grains and the conservation of diffusant. The following theoretical results are obtained from the analytical solution of the problem.…
Abstract not Available.
The solid solubility, disorder, and decomposition relationships in the system CaCO3-MgCO3 were investigated in the pressure range of from 10 to 10,000 bars and at temperatures of from 700° to 1,200° C. A sealed-tube technique was used for the most part in an internally heated pressure vessel designed for rapid operati…
Abstract not Available.
Single domain ferromagnetic particles have a large coercive force. This character disappears at elevated temperature and the particles behave as if they are paramagnetic even at the temperature below the Curie point. The recent development in this field is reviewed.
D. H. Everett, Trans. Faraday Soc., 1961, 57, 1541 DOI: 10.1039/TF9615701541
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEstimating Thermal Stability of Experimental Polymers by Empirical Thermogravimetric AnalysisC. D. DoyleCite this: Anal. Chem. 1961, 33, 1, 77–79Publication Date (Print):January 1, 1961Publication History Published online1 May 2002Published inissue 1 January 1961https://pubs…
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Abstract not Available.
Free volume vf is defined as that part of the thermal expansion, or excess volume Δv̄ which can be redistributed without energy change. Assuming a Lennard-Jones potential function for a molecule within its cage in the condensed phase, it can be shown that at small Δv̄ considerable energy is required to redistribute th…
The polymerization of silicic acid in the solution obtained by treating quartz with water at temperature 400℃ and under a specific volume of water 1.6ml/g was investigated from the changes in the concentration of molecular silica, the results were compared with those already reported, in which the silicic acid prepare…
Optical transmission and reflection measurements were made on a single crystal of CdSe (crystal class ${C}_{6v}$) with light polarized parallel and perpendicular to the $c$ axis. The absorption coefficients, ${\ensuremath{\mu}}_{\ensuremath{\perp}}$ and ${\ensuremath{\mu}}_{\mathrm{II}}$, were determined and are prese…