Materials Literature
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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…
NiO crystals free from twin structure were prepared by annealing at 1650°C in argon atmosphere and either by axially cooling through the Néel temperature with a temperature gradient set along [111] or by applying a stress along [111] at room temperature. Torque measurements were made at various temperatures and in mag…
Accurate lattice parameters of the tetragonal phase of VO 2 have been determined as a function of temperature by X-ray powder method in the temperature range 78°C to 415°C. Both the lattice parameters are found to increase with increasing temperature, the relative increase in the ` c ' parameter being greater than tha…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrolysis of titanium tetrafluorideYu. A. Buslaev, Daniel S. Dyer, and Ronald O. RagsdaleCite this: Inorg. Chem. 1967, 6, 12, 2208–2212Publication Date (Print):December 1, 1967Publication History Published online1 May 2002Published inissue 1 December 1967https://pubs.acs.or…
Speculation is offered on the nature of the molecular motion in crystals of polytetrafluoroethylene at temperatures well below the 19°C transition. It is proposed that a specific type of defect in the chain, a helix reversal point, creates a mechanism whereby large dynamic angular displacements of chain segments about…
Flow stress, electrical resistivity and dislocation density were measured in lightly cold-worked polycrystalline copper of 99·996% purity. Dislocation density was measured by thin film transmission electron microscopy. The dislocation resistivity was found to be independent of the dislocation density and to have value…
Abstract An experimental study of the flow of fine-textured, aqueous foams through Pyrex tubes is described. The foams range in quality F (ratio of gas volume to total volume) from 0.70 to 0.96 and behave like pseudoplastic fluids. At lower flow rates they exhibit laminar flow and have apparent viscosities which incre…
Adhesive and tractive forces of diatoms have been measured by the bending of a glass fibre. The results show that motility depends on attachment to the substrate. Movement on girdle bands occurs when the raphe acts against lumps of trail substance. Resistance to shear stress in laminar flow through a capillary tube is…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal Diffusion in Crystalline SolidsA. R. Allnatt and A. V. ChadwickCite this: Chem. Rev. 1967, 67, 6, 681–705Publication Date (Print):December 1, 1967Publication History Published online1 May 2002Published inissue 1 December 1967https://pubs.acs.org/doi/10.1021/cr60250a0…