Materials Literature
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Summary Some structural analogies found in tsumebite, vauquelinite, fornacite, and brackebuschite make it possible to place these secondary lead minerals in the same series with general formula Pb 2 Me II ( Z )( XO 4 )( YO 4 ), where M e II is a bivalent cation as Cu 2+ or Mn 2+ , Z is the hydroxyl group or the water…
A qualitative description is presented for the behaviour of the hysteresis loss and the dielectric constant in ceramic barium titanate in terms of the properties of single-crystal barium titanate. When the effects of imperfections and interaction between crystallites are introduced, this description explains the simil…
The object of this theoretical investigation is to determine the importance of the nonequilibrium region, which exists at the bubble wall, on the growth of a vapor bubble. All previous investigators concerned with bubble growth have completely neglected this nonequilibrium effect. In another paper [1] Bornhorst and Ha…
Abstract Quantitative gas chromatographic analyses supplemented by X-ray diffraction studies of the adsorption of ethanol and acetone (as model polar organic compounds) on homoionic montmorillonite revealed marked variation in the number of molecules associated with each exchange cation. The results show increasing as…
In the luminescence spectra of Eu 3+ in SrTiO 3 , two kinds of vibronic structure, i.e. , rather sharp satellite lines (vibronic lines) and asymmetric bands (vibronic tails), were found to exist. The tails were observed also in the spectra of Tb 3+ and Pr 3+ in SrTiO 3 . The tail strongly appears associated only with…
Abstract An experimental study of dedolomitization shows that effective dedolomitization requires not only the theoretically necessary high initial Ca (super ++) /Mg (super ++) ratio in the dedolomitizing solution, but also a high rate of water flow, a partial pressure of carbon dioxide much lower than 0.5 atm, and te…
Abstract Corrosion resistance is particularly important in medical treatments requiring implantation of metallic objects in the human body. Unfortunately, weight loss measurements and other conventional corrosion testing techniques are insufficiently sensitive and difficult to adapt to in vivo environments. The linear…
Foil specimens of about 3µ in thickness were directly stretched inside a 500 kV electron microscope, and the dynamic behaviors of dislocations were continuously observed. When the specimens are deformed, frequency of cross slip is increased with increasing amount of deformation, and a number of small prismatic disloca…
Widths and shapes of the three groups of absorption lines in ruby are measured in the 77–500°K temperature range. Temperature-dependent linewidths are successfully interpreted in terms of the direct and Raman relaxations. The observed asymmetric shapes of the B 3 and R 3' lines are shown to be due to the energy depend…
A brief description is given of a method for approximate synthesis of multilayer filters consisting of either homogeneous layers or inhomogeneous films. The method is based on the fact that the amplitude reflectance is the approximate Fourier transform of the function 12U′(p)/U(p), where U(p) is the effective refracti…
The ferroelectric Curie temperature of lithium metatantalate is linearly dependent on the melt stoichiometry. Curie temperatures ranging from 700° to 540°C were measured on single crystals and correspond to a melt composition variation of approximately 6 mole % on each side of apparent stoichiometry. High Curie temper…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystalline structure of amylose triacetate I. Stereochemical approachAnatole. Sarko and Robert H. MarchessaultCite this: J. Am. Chem. Soc. 1967, 89, 25, 6454–6462Publication Date (Print):December 1, 1967Publication History Published online1 May 2002Published inissue 1 Decem…
In a concentrated paramagnetic salt at low temperatures it is possible to think of spin excitations with a well-defined wave vector k similar to spin waves. These are coupled to the phonons and result in mixed modes given by the Jacobsen-Stevens relation. These mixed modes are studied by the Green function method of S…
Abstract The influence of crystallinity, thermal history, plasticization, copolymerization, and chemical modifications on the dynamic‐mechanical properties of poly(vinyl chloride) has been studied by means of a free‐oscillation torsional pendulum. It was found that the secondary dispersion maximum is not affected by f…
Knudsen evaporation experiments were made on gadolinium sesquioxide from 2350° to 2590°K. Two sets of Knudsen cell data yielded average values of 468.7 ± 0.8 and 471.0 ± 0.5 kcal/mole for the assumed evaporation reaction image The results indicate that the evaporation coefficient may be much less than one.
A study has been made of discharges occurring in voids. A sample of convenient size is described. A method of mea suring the discharge pulse has been developed which reduces the inductance of the circuit to a minimum. As a result it has been found that the pulses have rise times of the order of 1 ns which is shorter t…
Abstract The propagation, transfer, and short‐chain branching reactions in the free‐radical polymerization of ethylene were studied at temperatures of 20–80°C. under pressures of 160–400 kg. cm. 2 by means of two‐stage polymerization with the use of a specially designed reaction vessel. In the first stage, the polymer…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic properties of intermetallic compounds between the lanthanides and platinumWilliam E. Wallace and Yu. G. VlasovCite this: Inorg. Chem. 1967, 6, 12, 2216–2219Publication Date (Print):December 1, 1967Publication History Published online1 May 2002Published inissue 1 Dec…
Ferromagnetic resonance has been observed in a single-crystal sample of barium ferrite, BaFe12O19, under both single-domain and multidomain conditions, for orientations of the static field from 0°–90° with the easy axis of magnetization. The results verify in detail the predictions of the theory of Smit and Beljers fo…
Based on the Kirchhoff's hypothesis, a general bending analysis of circular plates for small deflection and axially symmetric loadings and support conditions is developed. The incremental theory of plasticity with von Mises yield condition and associated flow rule has been adopted. The material is assumed to be elasti…