Materials Literature
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Abstract Die Lumineszenz von 3 Gruppen von hexagonalen Aluminaten, den Magnetoplumbiten: Ca‐, Sr‐ und CaMg‐aluminat: Ce, den Verbindungen vom β‐Al 2 O 3 ‐Typ: Ba‐ und BaMg‐aluminat: Ce und den verzerrten Magnetoplumbiten: Laund LaMg‐aluminat: Ce sowie Ce‐ und CeMg‐aluminat, wird im Zusammenhang mit der Kristallstruktu…
Using the singular point detection technique measurements are made of the temperature dependence of the first and second anisotropy constants of the pseudobinary alloy series Y2(CoxFe1−x)17 where x = 0.5, 0.6, 0.7, 0.8, and 0.9. The temperature range used is 4.2 to 300 K. For all temperatures the first anisotropy cons…
Nd-phospate glasses with a great laser effect are described. They have large induced-emission cross sections and low thermal distortion. Those glasses can be used in small and medium laser equipment for processing of materials and for measuring techniques. Addition of fluorine (fluorophosphate glasses) produces a lowe…
Polarized vibrational resonance Raman spectra have been measured for eight hexahalide complexes of transition metals, low-spin d4 OsCl62−, OsBr62−, and low-spin d5 IrCl62−, IrBr62−, and low-spin d6 PdCl62−, PtCl62−, PtBr62−, and PtI62−. Polarization anomaly due to asymmetric Raman tensor was found for the d5 complexes…
The infrared absorption spectra of PuO and PuO2 in both Ar and Kr matrices have been identified. The observed frequencies at 794.25 and 786.80 cm−1 have been assigned to the ν3 stretching modes of Pu16O2 in Ar and Kr matrices, respectively. Normal coordinate analysis of the PuO2 isotopomers, Pu16O2, Pu16O18O, and Pu18…
The generalized Smoluchowski equation is used in a projection operator formalism to find an equation for the intermediate scattering function. Several different approximations are made to investigate the behavior of the intermediate scattering function for intermediate and long times. The generalized Stokes–Einstein r…
The oxidation state of iridium ions in an oxide film grown electrochemically on an Ir metal reflector electrode in aqueous 0.5M H2SO4 electrolyte can be rapidly and reversibly modulated by voltage pulses of 1 V amplitude according to the reaction: Ir(OH)n(transparent) ⇄IrOx(OH)n−x(colored)+xH++xe. This valency interco…
Linear, saturation magnetostrictions ${\ensuremath{\lambda}}_{s}$ of a variety of ${(\mathrm{FeCoNi})}_{80}$${\mathrm{B}}_{20}$ glasses have been studied as a function of temperature. Magnetostrictions over the range $4.2 \mathrm{K}\ensuremath{\lesssim}T\ensuremath{\lesssim}{T}_{C}$ for selected glasses, ${\mathrm{Fe}…
We prepared discontinuous gold films by ultrahigh-vacuum deposition onto Corning 7059 glass substrates. Optical transmittance at normal incidence was recorded; an anomalous absorption band occurred in the visible range. We described the optical properties within the Maxwell Garnett formalism with proper account taken…
A new correction procedure for converting electron-probe microanalysis measurements into true weight concentration is proposed. It incorporates a new atomic number correction and an absorption correction based upon Bishop's model (1974). Unlike earlier treatments the model does not have to rely upon any empirical opti…
For oxygen adsorbed on a Cu(001) surface, the O $1s$ x-ray photoelectron intensity is found to exhibit a complex azimuthal anisotropy with an overall amplitude of \ensuremath{\sim} 26% for a grazing 10\ifmmode^\circ\else\textdegree\fi{} angle of emission. No significant anisotropy is observed at 45\ifmmode^\circ\else\…
We show that a first-principles nonlocal pseudopotential theory, based on an all-electron density-functional formalism, provides an essentially exact topological separation of both the octet ${A}^{N}{B}^{8\ensuremath{-}N}$ structures and the suboctet ${A}^{N}{B}^{P\ensuremath{-}N}(3<~P<~6)$ structures for 77 and…
Water-soluble prepolymers of predominantly monomeric (Antiblaze 78) and dimeric (Antiblaze 77) chloroalkyl phosphonates and polyethylenimine (PEI) were prepared and applied to lightweight cotton containing fabrics These prepolymers imparted flame resistance to all-cotton fabrics and to a lesser degree to cotton poly e…
Abstract The K‐absorption spectra of zirconium are studied in the following substances: Zr, ZrO 2 , ZrC, ZrBr 4 , Zr(SO 4 ) 2 · 4 H 2 O, Zr(NO 3 ) 4 · 5 H 2 O, ZrOCl 2 · 8 H 2 O, and K 2 Zr(C 2 O 4 ) 3 . The fine structure within the main edge is discussed on the basis of band structure and is in general accordance wi…
Extending the temperature range of nematic liquid crystals is technologically important for the operation of electrooptic devices in environments where ambient temperatures vary widely. The expected lowest temperature limit (eutectic temperature) of eutectic-forming nematic mixtures is calculable from the equations of…
Abstract The naturally occurring cembrenoids (I, II, and III) were successfully synthesized, demonstrating unequivocally the assigned structure.
SUMMARY The method of calibration described in this paper depends on (1) bringing every specimen to the ‘eucentric point’ of a side‐entry goniometer stage to achieve a constant objective magnification, and (2) monitoring changes in the magnification of the projector lenses with a selected area (SA) aperture in the obj…
Abstract The effect of diffusion in the oxidative degradation of cis ‐1,4‐polyisoprene vulcanizates was estimated by the analysis of the transient state of diffusion and oxidative degradation. An expression for the number of network chain scissions was obtained by solving the diffusion equation, which takes into accou…
A method is proposed for determining volume ratios of domains in a poly-domain specimen of perovskite crystals with the space group I 4/ m c m ; the ratios are fundamental parameters in determining the crystal structure. The method is based on measuring relative intensities of triplets of Bragg reflexions with special…
The etching of gold films deposited on chromium adhesion layers in iodine solution creates cavities at the base of the films. These cavities or abnormal undercutting are revealed and studied by means of the scanning electron microscope. The abnormal undercutting causes the lifting of gold in the etching of high resolu…