Materials Literature
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On the basis of observations made by electron microscopy of the distribution of dislocations around undeformable particles embedded in a matrix of plastic crystalline metal, it is possible to see a clear transition from ‘laminar plastic flow’ to ‘rotational flow’ at a critical strain which depends mostly upon the part…
We investigated the interface between a three-dimensional substrate, Si, and a layered compound, GaSe, in the very first steps of the growth. Atomic models, related to deposits of 1.5 and 2.5 sheets, respectively, were derived from grazing incidence x-ray diffraction. They are based on the bulk phases, that is, on ${\…
The union of calcium cations with carbonate anions to form calcium carbonate (CaCO3) is a fundamentally important physiological process of many marine invertebrates, in particular the corals. In an effort to understand the sources and processes of carbon uptake and subsequent deposition as calcium carbonate, a series…
A microstructural analysis of silicon-on-insulator samples obtained by high dose oxygen ion implantation was performed by Raman scattering. The samples analyzed were obtained under different conditions thus leading to different concentrations of defects in the top Si layer. The samples were implanted with the surface…
The dc resistance and the temperature coefficient of resistance (TCR) of bulk nanostructured silver ($n$-Ag), synthesized by inert gas condensation and in situ vacuum compaction as well as by the sol-gel method, was investigated in the temperature range from 4.2 to 300 K. The results indicated that for all of the $n$-…
Analytic solutions for a sonoluminescing gas bubble have been obtained, which provide density, pressure and temperature distributions for the gas inside bubble oscillating under ultrasonic field. The solutions have revealed that sonoluminescence should occur just prior to the bubble collapse and its duration is less t…
The electronic, structural and magnetic properties of all transition-metal mononitrides are investigated by FLAPW band calculations. The equilibrium lattice constants estimated for NaCl-type ScN, TiN and VN and for ZnS-type FeN and CoN are in good agreement with the experimental data. The bulk modulus of MN tends to b…
Many crystalline solids fail by cleavage at low temperatures and by plastic processes at high temperatures. In the transition region, cleavage failure occurs at stresses increasing with increasing temperature, reflecting a decrease in yield stress and a consequent increase of plasticity around the crack tip. Crack tip…
Using a wide-field Kerr microscope, we have studied the magnetic domain structures of epitaxial and polycrystalline La0.67Sr0.33MnO3 thin films as well as a film having thermally induced 〈110〉 microcracks. The epitaxial film on a (001) SrTiO3 substrate has different magnetic domain behaviors for in-plane fields applie…
When molecules are subjected to static or dynamic uniform electric fields the effects are conveniently described in terms of dipole polarizabilities and hyperpolarizabilities. The fields act on both the electronic and vibrational motions simultaneously and, through perturbation theory, this leads to the exact sum-over…
We have investigated the structural and compositional changes that are induced by the segregation of substrate Mg to the surface of $1\ensuremath{\mu}$m-thick ${\mathrm{Fe}}_{3}$O${}_{4}(001)$ films on MgO(001). The thin films have been grown with plasma-assisted MBE. Characterization with reflection high-energy elect…
Photoluminescence (PL) and light absorption of Er-doped amorphous hydrogenated silicon are studied in the temperature range 77--300 K. In the linear pumping regime the intensity of the Er-induced luminescence decreases by a factor of about 15 in this temperature range. Frequency resolved spectroscopy shows that in the…
The electroluminescence (EL) from Si+ implanted SiO2 thin film prepared by thermal oxidation was compared with photoluminescence (PL) properties. Both EL and PL spectra indicate that the luminescence originate from the same three luminescence bands around 470, 600, and 730 nm. Annealing at temperatures below and above…
A Strategy for Structural-Acoustic Problems. Basic Notions on Variational Formulations. Linearized Vibrations of Conservative Structures and Structural Modes. Dissipative Constitutive Equation for the Master Structure. Master Structure Frequency Response Function. Calculation of the Master Structure Frequency Response…
We compare the thermal variations of ESR, dc, and microwave resistivity of unoriented bulk single wall carbon nanotube samples. We conclude that the ``metallic'' high-$T$ behavior $(d\ensuremath{\rho}/dT>$ 0) is an intrinsic property of the bulk material, and that the system remains metallic even at low temperature…
The electronic structure of the monoclinic phase of titanium monoxide and a vacancy-free rock-salt phase have been investigated using x-ray photoelectron spectroscopy and x-ray emission spectroscopy techniques. For the investigation of the monoclinic structure type, polycrystalline samples of titanium monoxide were us…
Transport and magnetic properties of ${R}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{TiO}}_{3+y/2}$ have been systematically investigated varying the one-electron bandwidth $(W)$ and the band filling $(n=1\ensuremath{-}\ensuremath{\delta}),$ which can be controlled by the $R$-dependent lattice distortion and by the C…
Quasi-hydrostatic-pressure measurements of electrical resistivity up to 11 kbar are presented for a series of manganese perovskites ${L}_{2/3}{A}_{1/3}{\mathrm{MnO}}_{3}.$ It is found that the Curie temperature ${T}_{C},$ being itself a function of the electronic bandwidth $W,$ displays a larger variation of $d\mathrm…
Using a combination of photoelectron and inverse photoelectron spectroscopy, we show that the band gap in a monolayer of C 60 on a Ag surface is strongly reduced from the solid C 60 surface value. We argue that this is a result of the reduction of the on-site molecular Coulomb interaction due to the influence of image…
In this paper we apply nonlocal kinetic coupling to the dynamic mean-field density functional method, which is derived from generalized time-dependent Ginzburg–Landau theory. The method is applied to the mesoscopic dynamics of copolymer melts, which was previously simulated using a local coupling approximation. We dis…