Materials Literature
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Wideline 1H NMR studies have been carried out in various hydrated layered chalcogenides of the type A+x(H2O)y [TaS2]x− at temperatures from 148 to 300 K, where A=Na, K, NH4, Cs, and Ca. Some measurements have been made at 77, 363, 398, and 425 K, respectively, and a sample with Nb instead of Ta has also been examined.…
We have directly measured thermally induced changes in surface and bulk energy-band dispersions of copper by examining angle-resolved photoemission from Cu(111) and Cu(100) surfaces for temperatures from 25 to 500\ifmmode^\circ\else\textdegree\fi{}C. Polarized synchrotron radiation was used as the photon source. Obser…
The elastic and diamagnetic properties of some p-disubstituted phenylcyclohexanes (PCH) are investigated by studying the elastic deformation of a nematic layer under the influence of electric and magnetic fields. The elastic constants kii (i=1, 2, 3) and the anisotropy Δχ of the diamagnetic susceptibility are obtained…
X-ray photoemission spectroscopy (XPS) measurements are reported for Zr${\mathrm{H}}_{1.65}$ and Zr metal. The valenceband measurements are compared with available band-theory density-of-states calculations for the metal and hydride. The hydride spectrum differs significantly from the metal spectrum. Most important, a…
The 21.2 eV photoelectron spectra of metal-free phthalocyanine and some metal-containing phthalocyanines MPc (M=Mg,Fe,Co,Ni,Cu, and Zn) have been obtained for the gaseous molecules. Comparison of these spectra reveals that the uppermost occupied orbitals are ringlike, and not metal-3d-like, in all cases. Identificatio…
Secondary-electron energy distribution curves (EDC's) and the total secondary-electron yields relative to such for gold have been measured for seven semiconductors for which electron-electron scattering losses within the emitter were considered dominant and for nine insulators (alkali halides) for which electron-phono…
An investigation of the photoluminescence decay in plasma-deposited amorphous Si: H is presented. The relative contribution of radiative and nonradiative transitions are shown in undoped samples with efficiencies varying over two orders of magnitude. In high-efficiency samples the 10-K radiative rate spans nearly six…
An $F$-center emission band (3 eV) has been observed in subtractively colored ${\mathrm{Al}}_{2}$${\mathrm{O}}_{3}$ crystals upon exciting with $F$ light (6.1 eV). The lifetime of the 3 eV luminescence is 36 \ifmmode\pm\else\textpm\fi{} 4 msec. We attribute this long lifetime to the forbidden triplet-to-singlet transi…
Stable and reproducible current-controlled bistable electrical switching has been observed in polycrystalline organic semiconducting films. The effect has been observed in a lamellar structure with a film of microcrystalline Cu-TCNQ between Cu and Al electrodes where the Cu-TCNQ is grown on a Cu substrate via a sponta…
The room-temperature 57 Fe Mossbauer spectra of the two iron-tellurium defect structure compounds FeTe and Fe 2 Te 3 are analysed, and shown to be superpositions of (respectively) three and four quadrupole-split pairs of lines. Each pair of lines in the total spectrum of each compound can be correlated with the differ…
The self-energy of an external moving charged particle near a surface is studied within the fast-charge approximation. For a reflecting trajectory, a formula for the complex self-energy, valid for an arbitrary dielectric function of the medium and angle of incidence, is first derived by means of a semiclassical analys…
The gap exponent for the isotropic-nematic phase transition in MBBA (N-[$p$-methoxybenzylidine]-$p$-butylaniline) has been determined from measurements of the induced birefringence in very strong magnetic fields. The experimental value, $\ensuremath{\Delta}=1.26\ifmmode\pm\else\textpm\fi{}0.10$, is consistent with the…
Abstract This paper is concerned with thermomechanics of thin shells by a direct approach based on the theory of a Cosserat surface comprising a two-dimensional surface and a single director attached to every point of the surface. In almost all previous developments of the thermo-mechanical theory of shells by direct…
High-resolution electron energy-loss spectra show unexpected features of electronic excitations in stage-1 Fe${\mathrm{Cl}}_{3}$-intercalated graphite. A sharp 1-eV plasmon surprisingly exhibits positive quadratic dispersion and damping characteristic of a free three-dimensional electron gas. However, the dispersion c…
This paper is one of those presented at the APCA Specialty Conference entitled “The User and Fabric Filtration Equipment—III”, held in October 1978 in Niagara Falls, New York. It presents guidelines for the application of vents for explosion protection in fabric filter systems. Detailed design procedures will soon be…
A pterin deaminase catalyzing the hydrolytic deamination of various pteridines was found in the bacterium, Bacillus megarerium, and partially purified from bacterial extract. The specific activity was raised 90-fold over that of the crude extract. The pH optimum is around 7.3, and the Km value for 6-carboxypterin is 1…
Abstract Über die Herstellung, Charakterisierung und Verarbeitung von Fibriden aus aromatischen Polyamiden wird berichtet. Das Haupteinsatzgebiet für diese Fibride ist die Herstellung von Elektroisolierpapieren mit hoher Dauerwärmebeständigkeit.
The longitudinal and transverse magnetostriction in EuS were measured at 1.8<T<146 K, in magnetic fields up to 130 kOe. In the paramagnetic phase (T≳Tc=16.49 K) the magnetostriction is predominantly due to the strain dependence of the exchange energy. The results are explained in terms of the theory of C…
We have measured the hyperfine magnetic fields at iron and tin in a new Heusler alloy Ru2FeSn using Mössbauer effect. The values for the hyperfine fields obtained at 80 K are 314.0 ± 1.6 and + 117.9 ± 1.5 kOe for iron and tin respectively. The field at tin is about a factor of two larger in comparison to Rh2FeSn while…
The polarized spectra of the triplet absorption in AgNa(NO 2 ) 2 have been investigated in the temperature range of -265∼70°C. The intensity of the E // b absorption decreases remarkably when the temperature is raised and approaches to T c . Above T c , it remains constant and is about 30% of the value at sufficiently…