Inorganic pyro-compounds M a [(X2O7) b ]
G. M. Clark and R. Morley, Chem. Soc. Rev., 1976, 5, 269 DOI: 10.1039/CS9760500269
Materials Literature
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Solutions of metals: solvated electrons
M. C. R. Symons, Chem. Soc. Rev., 1976, 5, 337 DOI: 10.1039/CS9760500337
Wavelength and Voltage Dependences of Refractive Indices of Nematic Liquid Crystals
Refractive indices of a mixture of nematic liquid crystals as functions both of wavelength and applied voltages were measured. The measured results are compared with a theoretical calculation in which first the distributions of tilt angle of the molecules were computed by solving a reorientation equation, then, the ef…
Are the Kramers-Kronig relations for the dielectric permittivity of a material always valid?
Всегда ли справедливы соотношения Крамерса — РљСЂРѕРЅРёРіР° для диэлектрической проницаемости вещества?, Киржниц Р”.Рђ.
Creep Deformation of 0° Sapphire
Creep deformation of 0° sapphire was studied between 1600°and 1800°C at stresses up to 114 MN/m 2 . Microscopical evidence (dislocation structures observed by transmission electron microscopy (TEM) and by etch pits) suggested that Nabarro climb was the predominant deformation mechanism. Both the experimental creep rat…
Raman Study of Ceramic Tungsten Trioxide at Low Temperatures
Raman spectra of powdered samples of tungsten trioxide have been obtained over the temperature range 80–300 K. No discontinuous or major changes in the spectra are observed, indicating that the transition at 233 K to the ferroelectric phase is inhibited for this form of sample, presumably because of perturbations to t…
Collagen Glucosyltransferase. Partial Purification and Characterization of the Enzyme from Whole Chick Embryos and Chick-Embryo Cartilage
A purification of over 2000-fold is reported for collagen glucosyltransferase from Triton X-100 extract of whole chick embryos and one of about 160-fold from similar extract of chick embryo cartilage. The addition of the detergent more than doubled the enzyme activity in the homogenates. The purified enzyme preparatio…
The gas phase pyrolysis of alkyl nitrites. I. t‐butyl nitrite
Abstract The rate of decomposition of t ‐butyl nitrite (TBN) has been studied in a static system over the temperature range of 120–160°C. For low concentrations of TBN (10 −5 ‐ 10 −4 M ), but with a high total pressure of CF 4 (∼0.9 atm) and small extents of reaction (∼1%), the first‐order homogeneous rates of acetone…
Transport properties of very pure copper and silver below 8.5K
Measurements of the thermal and electrical conductivity and thermopower of very pure copper and silver have been made between 1 and 8.5K. The copper samples have been distilled in graphite crucibles to reduce the concentration of magnetic impurities to less than 1 part in 10 9 , which is an order of magnitude improvem…
Theory for the equilibrium contact angle between a gas, a liquid and a solid
An alternative derivation is presented of the equation for the equilibrium contact angle between a gas, a liquid and a plane solid surface. The excess free energy of the system around the contact line is minimized with respect to the contact angle θ0 at constant surface area. Thus the surface tension (or surface free…
Chain conformation and structure in amorphous polymers as revealed by X-ray, neutron, light and electron diffraction
The physical structure of the melt, the supercooled melt, and the glassy state of amorphous polymers can be characterized by the chain conformation, the local order, and the morphology. The conformation was studied by small-angle neutron scattering. The local order was characterized by pair distribution functions whic…
Structure and deformation of polyethylene hard elastic fibers
Stress-strain and relaxation tests were performed in air between—196°C and +80°C, and in methanol and silicone oil at room temperature on linear polyethylene hard elastic fibers. Transmission electron microscope observations of similarly deformed specimens indicated that straining resulted in fibrils connecting separa…
π–π Aggregation in metalloporphyrins: causative factors
The strength of aggregation in PdII, NiII, ZnII, and CdII metalloporphyrins is shown by n.m.r. spectroscopy to depend upon interaction of the metal ion with the porphyrin π-system; within a selected series of 2,4-disbustituted deuteroporphyrin-IX dimethyl esters complexed with a constant metal ion the aggregation is f…
Some effects of morphology on oxidation and stabilization of polyolefins
Abstract Previous work on the effects of crystallinity on the autoxidation of polyolefins is briefly reviewed and shows that polyethylene and polypropylene oxidize exclusively in the amorphous phase. Measurements of the rate of oxidation of poly(4‐methyl pentene‐1) (P4MP) show that the oxidation is first‐order in oxyg…
The Cathodic Corrosion of Aluminum
Abstract not Available.
Depolarization effects in thin ferroelectric films
For a ferroelectric in form of a thin plate with the polarization perpendicular to the surfaces it is demonstrated that for the ferroelectric state to be stable the polarization discontinuity must be compensated by free charge. In thermal equilibrium the charge compensation can never be complete. Depolarization fields…
Influence of Irradiation Temperature, Burnup, and Fuel Composition on Gas Pressure (Xe, Kr, CO, CO 2 ) in Coated Particle Fuels
Relations have been derived from gas analyses of irradiated PyC‐coated UO 2 fuel particles that enable the quantity of permanent rare gas (Xe+Kr) released within the particle to be predicted from known conditions of irradiation temperature, time, and burnup. The experimentally determined influence of fissions in urani…
Theory of non-linear dielectric effects in liquids
A general theory of non-linear dielectric phenomena in liquids is proposed with the fundamental assumption, supported by a large body of experimental data, that such phenomena are specifically sensitive to molecular association processes due to electrostatic and chemical interactions. The relationships derived provide…
Dielectric nonlinearity of the displacive ferroelectrics at UHF
Consideration is given for the dielectric nonlinearity of ferroelectrics both in a strong static field with respect to the weak UHF field and in the strong UHF field. The dynamic theory of a soft mode is used as a basis for description of the phenomena. The parametric process in the strong UHF field is discussed. The…
Static strain waves in cholesteric liquid crystals. - I. homeotropic boundary conditions
Periodic strain waves have been studied using dilute solutions of cholesteric liquid crystals in nematic solvents. Experimental observations are in qualitative agreement with computer solutions of one constant elasticity theory. For the boundary conditions of parallel plates with homeotropic pinning of the director fi…