Materials Literature
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The dipole moment-covalency-polarisability correlation ligand-field model is proposed, after a number of experimental spectra data have been analysed. In this model, once the mu - kappa - alpha correlations are established, there is no need to introduce the fitting parameters in order to investigate the optical and ma…
Thermal properties of semiconductor superlattices have been investigated for the first time. The thermal properties of AlAs/GaAs superlattices were measured with the ac calorimetric method. It is found that the thermal diffusivity and thermal conductivity of the AlAs/GaAs superlattices are larger than those of the AlG…
The core structure of half-integer wedge disclinations in nematic liquid crystals has been investigated within the Landau-de Gennes theory, by solution of the appropriate Euler-Lagrange equations. Close to the nematic-isotropic transition the energy density exhibits a domain-wall-like structure around the core which d…
Formation of the equilibrium intermetallic compound NiZr in sputter deposited Ni/Zr diffusion couples is suppressed by the formation of a metastable amorphous NiZr alloy until a critical thickness of the amorphous NiZr interlayer is reached. The temperature dependence of this critical thickness is studied experimental…
A simple method is proposed to calculate total energies of solids with lattice defects. Lattice-defect energies are determined via perturbation theory on a crystal whose lattice constant is chosen optimally. The method is applied to the computation of surface energies of a series of transition metals as a function of…
The electronic structure of five antimony chalcogenides, Sb${\mathrm{I}}_{3}$, ${\mathrm{Sb}}_{2}$${\mathrm{Te}}_{3}$, SbTeI, TlSb${\mathrm{S}}_{2}$, and ${\mathrm{Tl}}_{3}$Sb${\mathrm{S}}_{3}$, is investigated. Information from x-ray diffraction, M\"ossbauer spectroscopy, electrical measurements, and photoemission sp…
Molecular, hydrodynamic, and thermodynamic properties of nylon 11 in meta cresol and 1,1,1,2,2,2-hexafluor-2-propanol (HFIP) solutions, as well as its distribution of molecular weights were investigated by means of viscosimetry, conductimetric titration of end groups, light scattering, and fractionation by successive…
A new class of positive deep ultravoilet (UV) resists consisting of poly(p-disilanylenephenylene)s was developed, in which a disilanylene unit and a phenylene unit are connected alternatively in the polymer main chain. These resists had very high etching resistance against oxygen plasma. The lithographic applications…
In our previous study,1 2,2′-bis(4H-3,1-benzoxazin-4-one) (BNZ) was found to be most effective among the tested chain extenders in coupling hydroxyl terminals of linear polyesters through addition reaction. Detailed studies on BNZ chemistry have been made using poly(ethylene terephthalate) and poly(butylene terephthal…
The courses of the reactions of the epoxides with the various derivatives of imidazole in the concentration range 0.5–25 epox. weight eq./mol imidazole and in the temperature range 80–155°C were studied. All imidazoles from adducts with epoxides very quickly, namely the 1-substituted imidazole 1 : 1 adducts, in case o…
Gels of syndiotacticity-rich poly(vinyl alcohol) (s-PVA) in mixed solvents of water/dimethyl sulfoxide (DMSO) or water/ethylene glycol (EG) were made by chilling at the temperatures of 0–70°C from those solutions with the polymer concentrations below 10g/dL. The melting points of the gels were measured warming the gel…
NaCl polycrystals, produced by press forging of single crystals at 275°C, are deformed in compression at room temperature. The dislocation structure is analysed by transmission electron microscopy as a function of the flow stress. Macroscopic yield of the polycrystals occurs at a stress that is equivalent to the flow…
The intermetallic compound Zr3Fe and its hydrides Zr3FeH5,6 and Zr3FeH6.9 are investigated with Mössbauer spectroscopy and X-ray diffraction. It is found that the three samples represent three different phases in the Zr3Fe-H system exhibiting distinct diffraction patterns and Mössbauer spectra. While the compound Zr3F…
In cyclic deformation experiments precipitation-hardened alloys in many cases show a softening effect after a hardening period. The softening occurs because the precipitates are destructed by gliding dislocations. For the destruction mainly two mechanisms are suggested. i) Disordering of ordered particles or ii) disso…
LEDS is the acronym for low-energy dislocation structures. LEDS are those structures in which the energy per unit length of participating dislocations is minimized through mutual stress-screening. They are characterized by the (virtual) absence of long-range stresses and by an alternation between areas with high and l…
The dense radial structure is a distinct morphology which develops in many diffusive pattern-forming systems. We propose the first model to explain the stability of this structure. Stability arises in this model from the resistivity of the growth channels, which has been neglected in previous analyses. We also report…
ABSTRACT Calcium carbonate scale, the most common oil field scale, normally forms from three-phase fluid systems at various downhole locations. The basic scale formation mechanism of CaCO3 in oil field operations was explained in a recent publication [1]. However, only the very basic model considerations and only a fe…
The use of X-ray diffuse scattering to carry out detailed investigations of vacancy and interstitial loops in ion and neutron irradiated copper is discussed. The theory and interpretation of asymptotic diffuse scattering near Bragg reflections are considered, and calculations are presented for the asymptotic diffuse s…
ABSTRACT There has been evidence of a need for scale inhibitor precipitation squeeze treatment in sandstone as well as in carbonate reservoirs. The Mixed Chelate process was designed to meet that need with the injection of a single solution. Success in the laboratory has been verified with numerous experiments. Succes…
X-ray rocking curves of the Bragg reflexion g = {200} are measured on [001]-orientated Cu single crystals deformed in tension at room temperature up to resolved shear stresses between 26.2 and 75.6 MPa. Forg= (200) and (020) the rocking-curve half widths δβ(ϕ) (the azimuth ϕ denotes the state of rotation of the specim…