Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Glasses containing up to 7 at.% nitrogen were prepared in the system Y‐Si‐Al‐O‐N. The glass transition temperature, hardness, and relative fracture toughness increase and the thermal expansion coefficient decreases with increasing nitrogen content. Weight losses after 350 h in 95°C distilled water are not simply relat…
The intensities of X-ray scattering from three compounds has been measured photographically at a number of temperatures. The substances studied were 4,4′di-n-octyloxyazoxybenzene (OOAB) and its di-n-heptyl homologue (HOAB) in their nematic and smectic C phases and ethyl-4-(4′acetoxybenzylidene)aminocinnamate (EABAC) i…
The chemical structures of thin SiO2 films, thin native oxides of GaAs (20–30 Å), and the respective oxide–semiconductor interfaces, have been investigated using high-resolution x-ray photoelectron spectroscopy. Depth profiles of these structures have been obtained using both argon ion bombardment and wet chemical etc…
An all-valence-electron self-consistent-field linear-combination-of-atomic-orbitals molecular-orbital procedure including configuration interactions for calculating the magnitude and sign of the nonlinear second-order molecular susceptibility components (hyperpolarizability) for substituted dipolar aromatic molecular…
Not available
Not available
Not available
Not avaible
Not avaible
Not avaible
Absorption and luminescence spectra of YAG:Ce 3+ crystals have been measured at various temperatures between 4.2° and 300°K. The high resolution, low temperature spectra show resolved fine structure. Zero‐phonon transitions have been assigned and the phonon replicas correlated with lattice phonon energies. The charact…
Abstract Studies of the effect of pH and competing cations on Zn 2+ and Cu 2+ solubility in an acid mineral soil indicate the probable involvement of hydrous oxides of iron, aluminum, or manganese in the adsorption process. Adsorption on permanent charge sites of clays, or complexation with organic matter could not ac…
A new isobaric, condensed phase diagram in the region of stability of cubic aluminum oxynitride spinel (ALON) along the pseudobinary AI 2 O 3 ‐AIN composition join is presented, deduced primarily from various analytical measurements and microstructural observations. It is shown that cubic aluminum oxynitride spinel me…
SUMMARY A survey is made of a number of the localized signal selection methods and related techniques which may be used to improve the electron microscope image contrast from small regions of material and thereby bring the specimen resolution actually achieved somewhat closer to the electron‐optical resolution of pres…
Liquid-crystal cells shaped like a plano-convex lens or a plano-concave lens are prepared. The focal length can be varied from the value f e for an extraordinary ray, where the liquid-crystal cell takes a homogeneous alignment, to f o for an ordinary ray, where it takes a homeo-tropic alignment, by applying an electri…
Symmetrical effective-medium theory is used to find the conductivity and Hall effect of a two-dimensional binary mixture. Results are given in detail in the limit of low applied magnetic field, when the expressions for the Hall coefficients simplify to linear combinations of the corresponding quantities for the compon…
The phase behavior and structures of several liquid crystals of the $n\mathrm{O}.m$ (${\mathrm{C}}_{n}{\mathrm{H}}_{2n+1}\ensuremath{-}\mathrm{OPhCHNPh}{\mathrm{C}}_{m}{\mathrm{H}}_{2m+1}$) series of compounds have been established by a variety of experiments. The hexagonal close-packed layers of the ${S}_{B}$ phases…
Abstract Systematics in the X-ray photoelectron spectra (X. p. e. s.) of Ti, V, Cr, Mn and Nb oxides with the metal ion in different oxidation states as well as of related series of mono-, sesqui- and di-oxides of the first row transition metals have been investigated in detail. Core level binding energies, spin-orbi…
Measurements of conductance and capacitance are made on polycrystalline β″-alumina over a range of frequencies from 10 to 107 Hz and temperatures from −130 to 400 °C. The results are analyzed using complex impedance plots which exhibited a bulk and grain boundary component. Above 220 °C the resistance of the grains ex…