Materials Literature
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Abstract In this work a detailed X-ray powder diffraction study of the reversible temperature transformation has been undertaken in several rare earth niobates MNbO 4 M being lanthanum, cerium, neodymium, gadolinium, holmium, thulium, ytterbium, and yttrium. Both high-temperature diffractometer and film techniques wer…
Abstract Bei der Polykondensation des Maleinsäureanhydrids bzw. der Malein‐ oder Fumarsäure mit Äthylenglykol wurde dessen Anlagerung an die Doppelbindung des ungesättigten Dicarbonsäurebausteins und die Bildung von 1‐(2‐Hydroxyäthoxy)‐äthan‐1,2‐dicarbonsäure bzw. deren Ester nachgewiesen. Die Anlagerung ist nicht nur…
The intensity of emission of Eu 3+ is shown to vary with its electrostatic binding energy in the tungstates which have the scheelite structure. Increasing the polarization of the oxygens toward Eu 3+ or Tb 3+ appears to decrease the total binding energies of these ions in the tungstates and molybdates. Brightness can…
Interest in titanium-base alloys as structural materials has inspired many studies of their phase relationships. These have provided the background essential to the development of commercial alloys, but have also revealed some unexpected, and still to some extent unexplained, aspects that are of considerable scientifi…
G. Williams, Trans. Faraday Soc., 1963, 59, 1397 DOI: 10.1039/TF9635901397
The reported structures of tungsten bronzes include cubic, pseudocubic, tetragonal, orthorhombic, and monoclinic distortions of the perovskitetype structure; well-characterized tetragonal and hexagonal structures, as found in the series K x WO 3; and some unit cells which are reported for isolated phases. This work su…
Abstract Results are presented for electron spin resonance measurements carried out at room temperature on freshly powdered high purity quartz and fused silica. As a result of the powdering, unpaired electrons are produced in concentrations of 10 14 to 10 15 per gram, depending on the particle size. The thermal stabil…
If J ( t )- iK ( t ) is the mean value of FF * for cells separated a distance t in the hkl direction, the mean-square broadening due to mistakes is W 2θ = - [λΔ(2θ) / 2π 2 cos θ] × [ J '(0) / J (0)] - [λ 2 / 4π 2 cos 2 θ] [ J ''(0) / J (0) + { K '(0) / J (0)} 2 ] where Δ(2θ) is the range of 2θ used in evaluating W 2θ…
Abstract Durch Grenzflächenpolykondensation wurde aus Hexamethylendiamin‐1,1,6,6,N,N′‐D 8 bzw. Adipinsäuredichlorid‐2,2,5,5‐D 4 Nylon 6,6 hergestellt, das in α‐Stellung zur Amidgruppe spezifisch auf der Amin‐ oder Säureseite (N‐vicinal und CO‐vicinal) deuteriert ist. Mit Hilfe der Infrarotspektren der aus diesen Probe…
M. J. M. Leask, L. E. J. Roberts, A. J. Walter and W. P. Wolf, J. Chem. Soc., 1963, 4788 DOI: 10.1039/JR9630004788
Stable phases in the rare earth oxide systems are tabulated and discussed. New data on the structure of sesquioxides quenched from the melt are reported. The structural interrelations between the A, B, and C type sesquioxides and the fluorite dioxides are pointed out. The sequences of several intermediate oxides in th…
Indium‐doped, copper‐doped, and undoped cadmium oxide films were prepared by reactive sputtering. The oxygen vacancy concentration in these films was changed by varying the oxygen pressure in the sputtering chamber. Electrical properties, spectral transmittance, and Hall effect were measured on doped and undoped speci…
Thin rectangular specimens of tantalum were oxidized on one side at 500°C and 1 atm oxygen pressure. From curvature measurements, the bending stresses arising as a consequence of the oxidation process were determined and correlated with known oxidation rate behavior and oxide morphology. The simplest stress model, tha…
Careful comparisons of cross sections for formation of 19 products of copper spallation by 3- and 30-GeV protons indicate only a small energy dependence in this energy range. As the energy is increased from 3 to 30 GeV, products of $A>40$ decrease in yield by 15% or less, except for some highly neutron-deficient sp…
When an electric field is applied to a metal, in addition to the transport of electrons, a relatively small transport of the metal ions also occurs. This process of mass transport of metal ions is sometimes referred to as electromigration or electrodiffusion, and will be referred to in this review as electrotransport.…
The Fabry-Perot modulator, consisting of Fabry-Perot etalon plates separated by an electrooptic material such as KDP, is analyzed in detail. Time-dependent perturbation theory is used to describe the coupling of the axial modes by spatial and time varying perturbations in the dielectric constant. The perturbations are…
A theory of the electrode potential of nonstoichiometric electron conductive metal oxides on a foreign metal is presented. When the oxygen ions of the oxide are in equilibrium with the electrolyte the oxide electrode potential is p H with the free enthalpy for the reaction as a function of the degree of oxidation n. T…
The electrical resistivity of Na x WO 3, Li x WO 3, and K x WO 3 has been measured at 300° K. The range of x values was 0.25 < x < 0.9. All resistivities were characteristic of a metal and lie on a single curve. Extrapolation of the conductivity curve to zero conductivity indicated that the tungsten bronzes should be…
G. I. Harris, J. Chem. Soc., 1963, 5978 DOI: 10.1039/JR9630005978
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