Materials Literature
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We have performed thermal-conductance measurements on polished single crystals of pure silicon in the low-temperature boundary-scattering regime. Our data show that the thermal conductance depends not only on the sample size, but also on the size and spacing of the thermometers used to measure the temperature gradient…
This paper examines the usefulness of cylinder-impact test data to determine constants for various computational constitutive models. The Johnson–Cook and Zerilli–Armstrong constitutive models are evaluated by comparing model predictions to tension, torsion, and cylinder-impact test data. Then the cylinder-impact test…
Cross sections for the production of O - by electron attachment to NO are reported. It is found that the maximum value of the cross section is about 52% higher than the only other previous measurement of Rapp and Briglia (1965). Cross sections for the process of polar dissociation (e+NO to N + +O - ) have also been me…
The influence of the plasticiser DOP on electric conduction and dielectric relaxation in polyvinyl chloride has been investigated. The results were explained in terms of the compensation law between the pre-exponential factor of an Arrhenius equation and its activation energy. This compensation law has been observed n…
New high-temperature superconductors based on oxides of thallium and copper, but not containing barium, have been prepared. A transition temperature (T(c)) of about 85 K is found for (Tl(0.5)Pb(0.5)) Sr(2)CaCu(2)O(7) whereas (Tl(0.5)Pb(0.5))Sr(2)Ca(2)Cu(3)O(9) has a T(c) of about 120 K. Both materials possess tetragon…
We report a linear correlation between the total intensities of the L2,3 white lines in electron energy loss spectra and the number of unoccupied 3d states in 3d transition metals. We show that this correlation can be used to obtain quantitative information about electronic changes during alloying and during solid-sta…
Abstract This paper is concerned with the way that nitrogen impurity in type Ia diamond is distributed between the defects responsible for the principal impurity-dependent infrared absorption maxima in the 7-11 µm wavelength range. The defects involved are the platelets on diamond {100} planes, which produce the B´ ab…
Presents thorough coverage of the transport properties of ions in gases. Starts from first principles, making this book useful to those new to the field as well as to experts. Describes the motions of ions in gases in electric fields, methods for measuring mobilities and diffusion coefficients, and pitfalls in measuri…
Superconducting BiCaSrCu2Ox glass rods and coils were successfully prepared by pumping up the melt at 1150 °C into SiO2 or Pyrex glass tubes. After the outer glass tubes were removed, the resultant glass rods up to 30 cm long were crystallized under a temperature gradient of 30 °C/mm without deforming and cracking. Th…
A transmission electron microscope study of the structures of grain boundaries in zinc has been performed. Dislocation structures are observed in many high angle boundaries, and in most cases, the boundaries that exhibit such structure are close in misorientation to a coincidence site lattice (CSL) forming misorientat…
Abstract Electron–hole recombination luminescence is investigated in CsCdBr 3 crystals. This luminescence consists mainly of a single band at 1.9 eV, assigned to a transition 3 Σ → 1 Σ . The comparison between this emission and emission observed under the 4 eV excitation confirms that the latter is due to Br centers.
Disclinations in thin crystals of MgCd alloy are demonstrated by high resolution electron microscopy. The disclinations appear along the intersection lines of twin boundaries which occur due to spontaneous lattice deformations at the phase transition temperature. A star-disclination which is not an intersection line c…
Using high-purity starting materials, we synthesized a new room-temperature Cs2KInCl6 phase (I): monoclinic (C2/c), a = 25.484(11), b = 7.699(2) and c = 13.225(3) Å, β = 100.69(3)°. A ferroelasticparaelastic phase transition is noted at Tc = 100°C (by Thermal Analysis and X-ray, Raman-scattering, electrical permittivi…
Abstract A prerequisite for the protection of metallic materials against atmospheric corrosion is to prevent the deposition of water on the metal surface. If present in sufficient concentration, amphiphilic corrosion inhibitors are adsorbed on metallic surfaces as closely packed hydrophobic films which form a barrier…
Reduction of 4,4,9,9-tetramethyl-5,8-diazadodecane-2,11-dione yields the meso and racemo isomers of 4,4,9,9-tetramethyl-5,8-diazadodecane- 2,11-diol which form trinuclear compounds [Cu3( amat )2](ClO4)2 with all ligand alcohol groups deprotonated . The structure of the compound of the racemo amino alcohol has been det…
Experiments have characterized the operation of a LaB6 triode gun in a standard three-lens column of the type used for Gaussian electron-beam lithography and scanning electron microscopy. A series of images representing cross sections of the three-dimensional spatial distribution of current emitted from the gun is obt…
Abstract Mixtures of novolac resin with pressed cottonseed in different proportions after their curing as small cylinders, and also pressed cottonseed as powder were pyrolyzed until 1000°C. Some samples follow, as well as an activation process by steam between 700 and 950°C. The weight losses of the samples are much h…
In this work experimental results in infrared absorption at low temperatures on the layered compounds of the MPX3 (M=Fe,Ni and X=S,Se) family are reported. The absorption spectra in the far infrared (between 50 and 500 cm−1) recorded on thin slabs of these compounds (10 μm thick) are compared with the corresponding Ra…
Abstract Cross‐linked networks of poly(dimethylsiloxane) were swelled with styrene containing benzoyl peroxide. Polymerization of the styrene in situ, by increasing the temperature, gave novel elastomeric composites. Scanning electron micrographs suggest that low concentrations of styrene (∼ 14 wt.%) gave primarily lo…
Fission products and other compounds released during severe nuclear power plant accidents will form aerosol particles, which include water-soluble compounds such as cesium hydroxide (CsOH), cesium carbonate, and cesium iodide. These hygroscopic particles will grow in a humid environment, and thus their settling rate i…