Materials Literature
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The absorption edge (380-500 m\ensuremath{\mu}) of AgBr was investigated with fine-grain suspensions in water. When the small amount of Rayleigh scattering was subtracted, the absorption coefficient was calculated from the remaining specular density. Comparison of crystals of about 65 \AA{} radius with bulk material s…
The electron spin resonance of magnesium pyrophosphate (Mg2P2O7) doped with 0.3% manganese pyrophosphate has been studied at room temperature and in the temperature range of 55° to 94°C using a microwave frequency of 35 Gc/sec. The parameters of the spin Hamiltonian and the orientation of the principal axes of the Mn2…
The mechanism of energy transfer between Eu and Nd and the migration of excitation between Eu ions in the Na0.5(Y, Eu, Nd)0.5Wo4 tungstates and (Y, Eu, Nd)2O3 sesquioxides are examined. Transfer from Eu to Nd appears to be predominately by dipole—dipole interactions. At high Eu concentrations energy may migrate betwee…
A number of experimental techniques have been combined to study radiation-induced defects that are complementary to $F$ centers. One series of experiments, in which the resistance to dislocation motion due to interstitial centers was monitored by means of flow-stress changes, indicated that the centers produced by irr…
Critical scattering of neutrons around the superlattice reflections (1, 0, 0) and (1, 1, 1) from a single crystal of $\ensuremath{\beta}$-brass has been measured at temperatures from 2 to 25\ifmmode^\circ\else\textdegree\fi{}C above the transition temperature. The temperature dependence of the critical peak intensity,…
Phonons in sodium fluoride have been studied at room temperature using inelastic neutron scattering techniques. Consistent results were obtained using a cold neutron time-of-flight apparatus and a triple-axis spectrometer. The time-of-flight results were interpolated on to symmetry directions from the observed scatter…
The spectra between 4000 and 23 000 cm−1 of gaseous UCl4 have been obtained for the temperature range 950° to 1250°K. These spectra have been compared with those of single-crystal UCl4 at 77°K and room temperature. Spectra of solid UCl4 were obtained over the temperature range 300° to 827°K in order to compare with th…
The electrical resistivity and the magnetoresistance in $n$-type InSb containing more than 1.8\ifmmode\times\else\texttimes\fi{}${10}^{14}$ ${\mathrm{cm}}^{\ensuremath{-}3}$ carriers have been measured from 4.2 to 0.1\ifmmode^\circ\else\textdegree\fi{}K. The resistivity increases logarithmically as the temperature is…
The exciton structure in hexagonal ZnS has been studied in transmission and interpreted in terms of an effective-mass formalism. The ${n}_{1}=1,2,3,4,\mathrm{and}5$ states of the first (${\ensuremath{\Gamma}}_{7}\ensuremath{-}{\ensuremath{\Gamma}}_{9}$) series, and the ${n}_{2}=1,2,\mathrm{and}3$ states of the second…
The band-to-band optical absorption is calculated for a direct-band-gap semiconductor that has one band degenerate $n$ or $p$ type. The degenerate band is treated as a high-density Fermi gas. It is shown that exciton states, arising from the electron-hole Coulomb attraction, still affect the optical absorption. The ca…
The valence and conduction bands of potassium chloride were determined by the augmented-plane-wave method from a potential of a more general functional form than that usually assumed in this method. With a few iterations of the band calculation within the Hartree-Fock-Slater (HFS) approximation, a good degree of self-…
Abstract p ‐Isocyanatobenzenesulfonyl chloride (I) and m ‐isocyanatobenzenesulfonyl chloride (II) were prepared by treating the corresponding aminobenzenesulfonic acids with phosgene and phosphorous pentachloride in dioxane. Tha compounds I and II were subjected to polycondensation‐addition with several diamines to ob…
Biotite alteration under acid conditions proceeds differently from the generally accepted pathway of transformation to vermiculite in which hydrated cations cause interlayer expansion, resulting in a dark-colored peripheral band on mica particles. Acid solutions of synthetic or biologic origin remove octahedral ions,…
The single-ion contribution to magnetostriction in the transition metal monoxides NiO, MnO, FeO, and CoO is calculated on a very simple model and found to account for substantially all the observed magnetostriction. Exchange is included in a molecular-field approximation, and the single-ion magnetoelastic parameters $…
The transfer of energy from single chromium ions to closely coupled pairs of chromium ions in ruby has been investigated. Ruby samples whose concentrations ranged from 0.003 to 1.0% ${\mathrm{Cr}}_{2}$${\mathrm{O}}_{3}$ were prepared and in each crystal the intensity of single-ion fluorescence and of pair fluorescence…
The single-electron capture and loss cross sections ${\ensuremath{\sigma}}_{0,\ensuremath{-}1}$ and ${\ensuremath{\sigma}}_{01}$ for 2-50-keV hydrogen atoms incident upon hydrogen molecules and inert-gas atoms have been measured directly by observing the growth of the fast-collision products (i.e., the fast primary $\…
The significance of present knowledge of the structure of the protein collagen to the study of isinglass and the finings derived from it is examined. It is suggested that differences in fining efficiency of solutions prepared by identical processes from different sources of isinglass are due to variations in the size…
As a method to desilicify from black liquor containing silica in rich amount, carbon dioxide process was investigated. Particularly, the relation between the final pH of the black liquor and the removal percentage of silica by the carbon dioxide treatment was clarified. Further, based on the obtained knowledge of the…
The phenomenological effects of calcination as expressed by such properties as shrinkage, specific gravity, bulk density and porosity were investigated on magnesites from different sources in India, over temperatures ranging from 600°C to 2000°C. No single property is adequate to assess properly the quality of a magne…
B. M. Gatehouse and P. Leverett, Chem. Commun. (London), 1967, 374 DOI: 10.1039/C19670000374