Materials Literature
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Measurements of the peak counting rate in the angular correlation curve of positron annihilation radiation have been performed in the solid and liquid phase of indium, lead, and aluminum, and in the solid phase of magnesium, as a function of temperature. In the solid phase In, Pb, and Al show at low temperatures the t…
Abstract The crystal field splitting of the 3 H 4 ground state of the Pr ion in PrFeO 3 and PrGaO 3 has been investigated by inelastic scattering of thermal neutrons. At several temperatures the transitions have been measured by TAS and TOF methods for polycrystalline PrFeO 3 and by the TOF method for polycrystalline…
A d-dimensional zonotope Z in Ed which is the vector sum of n line segments is linearly equivalent to the image of a regular n-cube under some orthogonal projection. The zonotope in En-d which is the image of the same cube under projection on to the orthogonal complementary subspace is said to be associated with Z. In…
An expression is derived for the "primary" pyroelectric coefficient. In contrast to currently accepted theory, it is proportional to ${T}^{3}$ near absolute zero, and it depends on the anharmonic potential in the same way as on the second-order dipole moment.
Single crystals of NdCr${\mathrm{O}}_{3}$ were studied by means of bulk magnetization, susceptibility, and optical-absorption spectroscopy measurements. This compound orders at ${T}_{N}=214$ \ifmmode^\circ\else\textdegree\fi{}K in a ${\ensuremath{\Gamma}}_{2}({F}_{x})$ canted antiferromagnetic spin structure which per…
The Onsager theory of dissociation, based upon the solution of Brownian equations of motion of charge carriers interacting through a Coulomb potential in an applied electric field, is shown to account for the electric-field-enhanced conductivity in solids. In contradistinction to often quoted one-dimensional macroscop…
Photoemission spectra of the second-row hydrides CH4, NH3, H2O, and HF, as well as Ne, obtained with ultrasoft (132.3 eV) x rays from the yttrium Mζ line and with soft x rays are compared and discussed. The 2s-derived 2a1 or 2σ orbitals show large relaxation energies, as do the 2s orbitals in the free atoms. The high…
The application of a static magnetic field to a single crystal of synthetic magnetite (${\mathrm{Fe}}_{3}$${\mathrm{O}}_{4}$) at 4.2\ifmmode^\circ\else\textdegree\fi{}K is found to induce a static electric polarization which is a nonlinear function of the components of the magnetic field and exists even in the absence…
Abstract The ability of corona treatment to render polyethylene film self‐adherent has been previously reported and the mechanism explained. A similar effect has now been found with corona‐treated poly(ethylene terephthalate) film which adheres strongly to itself when joined under conditions of heat and pressure that…
Abstract A DTA apparatus for the temperature range −200°C to +150°C and up to 3000 bar is described. The apparatus is applied to the calorimetric investigation of the phase behaviour of pentane, hexane, heptane, octane, nonane, decane, isopentane, 2,2‐dimethylbutane, 2,3‐dimethylbutane, cyclopentane, cyclohexane, and…
A theory of dielectric relaxation is presented which relates the frequency-dependent dielectric constant to a truly single-particle correlation function. For a sample of suitable geometry, linear response theory is used to relate the polarization to a many-particle correlation function. This correlation function is sh…
"Magnetoelectric Interaction Phenomena in Crystals." Optica Acta: International Journal of Optics, 22(12), p. 1042
A mathematical formalism developed for investigating the dynamics of cavitation bubbles has been used to obtain numerical solutions describing the behavior of bubbles of different initial radii that are damped by heat conduction, viscosity, and compressibility. Calculations have been made to determine two measures of…
Abstract Fibrous sepiolite crystals derive much of their commercial value from their molecular size channels and grooves. The crystals fold upon drying and these channels and grooves are lost. A model for the folding and unfolding of the crystals is presented. Extensive i.r., X-ray and thermogravimetric evidence shows…
The oscillator strengths of the hypersensitive f-electron transitions in lanthanide(III) complexes, the quasi-quadrupolar transitions with intensities sensitive to the ligand environment, are found to arise principally from the coulombic correlation between transient induced electric dipoles in the ligands and the f-e…
This study was concerned with the hydration of clinker compounds in the presence of different additives; it appeared that accelerating additives, such as calcium chloride and silicic acid, produce longer fibers of tobermorite, whereas inhibitors, such as sugar, produce shorter fibers of tobermorite. This same effect w…
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