Materials Literature
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The fluorescence of Nb5+-activated antimonates is reported. A relation has been found between the position of the maximum of the excitation (and absorption) band of the niobate octahedra and the quenching temperature of their fluorescence. This result can be explained using a simple configuration-coordinate diagram. T…
Abstract The thermal and oxidative degradation of poly(phenylene sulfide) and perfluoropoly(phenylene sulfide) have been studied by a weight‐loss method. The products of breakdown in vacuum have also been analyzed. The poly(phenylene sulfide) is more thermally stable in inert and oxidizing atmospheres than the fully f…
Abstract The adhesion between a polymer and a solid substrate may be considered to be one type of complex liquid‐solid interaction. Relationships between surface wettability and bulk properties of liquidlike polymers are discussed. A new and direct empirical relationship between the glass temperature ( T g ) and criti…
A multilayer model of the interface between a solid and a regular solution has been developed by treating the solution phase in the grand canonical ensemble. The partition functions necessary for the evaluation of the grand partition function are obtained using either the quasi-chemical or Bragg-Williams approximation…
The Dorn method, most commonly used to measure the activation energy of creep, was used to study the initial stage of sintering uranium dioxide in hydrogen from 700° to 850°C. The activation energy was approximately 100 kcal/mole. This result agrees with the value determined from analysis of isothermal shrinkage curve…
Far-infrared spectra of imidazole, imidazole-d4, 1-methyl imidazole, and 1-methyl-d3 imidazole have been examined in the 300 − 33-cm− 1 range. Six of the nine infrared-active lattice modes of crystalline imidazole have been observed and assigned. A tentative assignment of these frequencies in terms of hydrogen-bond mo…
Magnetomechanical damping in ferromagnetic materials has its source in stress-driven irreversible movement of magnetic domain boundaries. The maximum damping is proportional to λsE/σi, where λs is the saturation magnetostriction, E is Young's modulus, and σi is the average internal stress opposing domain boundary moti…
The crystal structure of ceric ammonium nitrate, (NH^^Ce^O^)^, has been determined from three dimensional single-crystal X-ray dif fraction data collected by counter methods.The crystals are monoclinic, space group P2^/n with unit cell parameters a = 13.061± 0. 007, b = 6.842 ± 0. 004, c = 8. 183 ± 0. 004A, B = 91.34±…
A series of mixed metal oxides with perovskite-type structure, A 2 (FeMo)O 6-λ (where A=Ba, Sr and Ca), were synthesized. The ferrimagnetic Néel temperatures of Ba 2 (FeMo)O 6 , Sr 2 (FeMo)O 6 and Ca 2 (FeMo)O 6 , were respectively found to be 351°K, 450°K and 398°K, with the saturation moments of 3.6∼3.2 µ B . The Mö…
The optical properties of strongly absorbing uniaxial crystals are examined. Equations for the reflectances for the basal plane are derived. The angle of refraction is discussed and the absorption coefficient for the ordinary wave is derived. The reflectance equation is solved in a form suitable for computer calculati…
It is shown that there is a size below which a coherent spherical precipitate cannot maintain a dislocation loop at its interface. There is also a size above which the incoherent (i.e. dislocated) state is stable with respect to the coherent state. Experiments in the electron microscope show that there is indeed a siz…
Crevice corrosion of titanium in high temperature sodium chloride solutions was investigated, Corrosion occurred only in very restricted crevices and attack was greater the higher the salt concentration. It was shown that crevice corrosion occurs because of the development of a low ( ~1) pH in the solution within the…
The flow stress distribution below the surface of previously deformed large copper single crystals is obtained when these are sliced into smaller component crystals. It is found that a considerable flow stress gradient extends for a distance of about 2 mm below the surface, measured along the slip direction. Electron…
Electrolytic charging of hydrogen onto Type 304L stainless steel at room temperature and 100 C (212 F) induced partial transformation of the austenite to the same martensitic phases [α′(bcc) and ε (hcp)] as are formed by cold-working hydrogen-free austenite at low temperatures (-196 C) (-321 F). No evidence of a hexag…
The energy spectra of Auger electrons from clean Au, Ag, Cu, Pd, and Ni surfaces have been determined. Uniform deposition of a second metal onto clean metal surfaces has made it possible to assess the depth of the surface region which contributes to the Auger peaks in the secondary electron energy distribution charact…
Abstract In order to get information about the mechanism of the thermal decomposition of hexamethylene tetramine (hexa), hexa was decomposed thermally in a vacuum vessel, and the composition of the gas thus produced was determined with a mass spectrometer. The main products found were ammonia and a carbon-rich solid r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrolytic hydrogen evolution reaction on aluminum in acidic solutionsAshok K. VijhCite this: J. Phys. Chem. 1968, 72, 4, 1148–1156Publication Date (Print):April 1, 1968Publication History Published online1 May 2002Published inissue 1 April 1968https://pubs.acs.org/doi/10.…
Abstract A criterion of tensile failure in terms of energy density and energy loss at break has been developed for several gum rubbers over a wide range of test temperature. A similar description of failure in filled rubbers is related to the gum criterion by a simple elastic interaction term. The upper and lower limi…
Young's modulus and the shear modulus (at room temperature) are reported for the first time for bulk isotropic graphites of various porosities. Extrapolations to zero porosity indicate Young's modulus and the shear modulus of theoretically dense isotropic graphite to be 255 kilobars and 97 kilobars respectively. Poiss…
The crystal structure of CS2 was determined at two temperatures from intensity data measured with a proportional counter and a modified Weissenberg apparatus. The orthorhombic cell [(a) 6.3437(8), (b) 5.5244(4), (c) 8.9971(7), 143°K, Cmca, Z = 4] exhibited marked anisotropic thermal expansion, the coefficients of ther…