Un procedimiento para separar, a alta temperatura, la fase líquida del clínker de los sólidos a los que impregna
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Resistencia química del hormigón. III.-Acción del agua de mar. Influencia de la adición de escoria al cemento portland (2.a parte)
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Bibliografía
An analysis of the Rietveld refinement method
An analysis of the Rietveld profile refinement method used in the interpretation of neutron or X-ray powder diffraction patterns has been carried out. It is shown that the values obtained for the structural parameters are not exactly the same as those obtained from an integrated intensity refinement of the same data a…
Effective coordination numbers (ECoN) and mean fictive ionic radii (MEFIR)
Article Effective coordination numbers (ECoN) and mean fictive ionic radii (MEFIR) was published on December 1, 1979 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 150, issue 1-4).
Annihilation of dislocations during tensile and cyclic deformation and limits of dislocation densities
It is proposed that, during dislocation glide at low temperatures, both screw and non-screw dislocations annihilate mutually with dislocations of opposite sign approaching on closely neighbouring glide planes. The experimental evidence is summarized and possible mechanisms are discussed. Phenomenological models of dis…
Electronic structure of GaSe, GaS, InSe and GaTe
Two-dimensional and three-dimensional band structures of the GaSe family of crystals have been calculated by the tight-binding method. The author's calculations fit the photoemission bandwidths well, particularly for the anion p x,y bands and, for GaSe, find similar band orderings and dispersions to those of M Schlute…
Precipitation of oxygen in dislocation-free silicon
The precipitation of oxygen in bulk dislocation-free Czochralski silicon subjected to isothermal annealing at temperatures between 400 and 1100 °C is studied by means of infrared spectroscopy and transmission electron microscopy. From the changes in the infrared spectra observed after heat treatment it is concluded th…
Isotope effect and self-diffusion in face-centred cubic cobalt
Self-diffusion in cobalt is investigated from 896 to 1745 K by means of the standard radio-tracer method using lathe sectioning in the paramagnetic and sputter sectioning in the ferromagnetic region. The diffusion coefficients vary between about 10−17 cm2 s−1 and 10−9 cm2 s−1; their temperature dependence can be descr…
Radiation-induced processes in experiments carried out in-situ in the high-voltage electron microscope
The results of experiments carried out in the HVEM may be influenced by radiation effects which occur during observation. The appropriate processes are reviewed. Atom displacement threshold energy data are compiled and the consequences for the applicable specimen thickness discussed for the case that experiments are p…
Molybdenum trioxide (MoO3)/silicon photodiodes
Molybdenum trioxide (MoO3) has been deposited onto single-crystal p-type silicon by neutralized ion-beam sputter techniques. The results indicate that the diode behavior is a function of oxygen partial pressure during the reactive sputtering. Film thickness, deposition rate, index of refraction, resistivity, and integ…
Zoom null lens
A simple null lens is described that is moved back and forth relative to a point source to provide large amounts of variable wave front aberration. This device can be used to test a wide variety of optical components and systems.
Superposition model analysis of the cubic spin-Hamiltonian parameters for Mn2+ and Fe3+ in the alkaline earth oxides, fluoroperovskite, and II–VI compounds
An analysis, in terms of Newman’s superposition model, of the cubic spin–Hamiltonian parameters for divalent manganese and trivalent iron in fluoroperovskite and II–VI compounds is presented. Values for the intrinsic parameter ?4 and for the power-law exponent t4 of Mn2+ with F−, S2−, Se2−, and Te2− ligands are report…
Electrochromic iridium oxide films prepared by reactive sputtering
We report the preparation and electrochromic properties of iridium oxide films deposited by reactively sputtering iridium in a humidified oxygen discharge. These sputtered iridium oxide films (SIROFs) have the fast coloring and bleaching kinetics and excellent stability previously observed for anodically grown iridium…
Surface-induced ordering of a liquid crystal in the isotropic phase
A detailed account of a measurement of order parameter of a liquid crystal at the boundary by means of the wall-induced pretransitional birefringence is given. Several surface treatments were studied including surfactants and evaporated films. Although all treatments produced good alignment in the nematic phase, the b…
Thermomagnetic and thermoelectric properties of potassium
We present the results of an experimental and theoretical study of the thermal and thermoelectric properties of pure potassium for zero magnetic field and for fields up to 4.5 T, at temperatures of 1.5-4.2 K. The approximate quadratic dependence on field of the transverse thermal magnetoresistivity is found to be the…
Optical absorption and fluorescence intensities of Nd 3 + in the garnets Ca Y 2 Mg 2 Ge 3 O 12 and Gd 3 Ga 5 O 12 and the biaxial crystal La 2
The Judd-Ofelt (JO) theory was applied to interpret the optical-absorption intensities of trivalent neodymium (${\mathrm{Nd}}^{3+}$) in the garnets Ca${\mathrm{Y}}_{2}$${\mathrm{Mg}}_{2}$${\mathrm{Ge}}_{3}$${\mathrm{O}}_{12}$ and ${\mathrm{Gd}}_{3}$${\mathrm{Ga}}_{5}$${\mathrm{O}}_{12}$ and the biaxial crystal ${\math…
Infrared spectroscopic study of activated surface processes: CO chemisorption on supported Rh
The infrared spectrum of CO chemisorbed on alumina-supported Rh surfaces has been studied following chemisorption at cryogenic temperatures. Major differences are observed in the distribution and spectroscopic character of chemisorbed CO species produced at low temperatures (110–170 K) compared to chemisorbed CO speci…
Wideband optical monitoring of nonquarterwave multilayer filters
The construction of optical filters, which are required to have optical properties well defined over wide spectral regions, demands the use of multilayer designs in which there are no simple relationships between the thicknesses of the layers. There are considerable difficulties in the manufacture of such multilayers.…
Microscopic origin of the companionA1Raman line in glassy Ge(S,Se)2
A solution to the long-standing problem of the companion ${A}_{1}$ Raman line [symmetric breathing mode of Ge${(\mathrm{S},\mathrm{S}\mathrm{e})}_{4}$ tetrahedra] in Ge${(\mathrm{S},\mathrm{S}\mathrm{e})}_{2}$ glasses is proposed based on the observation of a similar doublet in the crystal. The proposed model assumes…