Materials Literature
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Une méthode de mesure de la dispersion et de l'amortissement des ondes longitudinales dans une barre élastique ou faiblement viscoélastique est présentée. Elle est fondée sur l'analyse des résonances présentes dans le spectre du signal de la déformation produite par un chargement indéterminé. Appliquée à une barre d'a…
(100)- and/or (001)-preferred-oriented and (111)-preferred-oriented polycrystalline Pb(Zr,Ti)O3 (PZT) films with Zr/(Zr+Ti) ratios of 0.35 and 0.62, corresponding to tetragonal and rhombohedral PZT, respectively, were compared with that of epitaxially grown ones with the same composition and similar orientation from t…
Red, green, and blue light emissions have been obtained at 80 and 300 K by cathodoluminescence (CL) from N-rich turbostratic BN thin films doped with Eu, Tb, and Tm, respectively. The films were grown by rf magnetron sputtering in an atmosphere of Ar and NH3 gas mixture using EuB6, TbB6, and TmB12 targets, respectivel…
Three azobenzene-containing side-chain liquid crystalline polymers (SCLCPs) were grafted onto a styrene−butadiene−styrene (SBS) triblock copolymer to yield photoactive thermoplastic elastomers. The SCLCPs used were a polymethacrylate and two polyacrylates having different glass and phase transition temperatures. We ha…
The extension of the high-power applications of sonic and ultrasonic energy in industrial processing requires the development of efficient and powerful transducers. Years ago some of the authors of the present paper proposed a new concept of ultrasonic transducer for use in fluids (more specifically in gases) based on…
The cluster Ti3O(OPri)8(benzoate)2 is obtained upon reaction of Ti3O(OPri)10 or Ti3O(OPri)9(OMe) with benzoic acid. The remarkable feature of this substitution reaction is that the cluster structure is approximately preserved. Ti3O(OPri)8(benzoate)2 undergoes a dynamic exchange processes of the propoxy groups in solut…
The structure and electronic spectra of merocyanines are intermediate between those of acyclic polyenes and cationic symmetric cyanines of comparable sizes, shifting from one to the other as a result of a solvent polarity change. In this paper we address, both theoretically and experimentally, the question of how the…
Thermodynamic analysis was performed with respect to the effect of surface tension on the expansion characteristics of a one-dimensional nanoscale liquid Ga column inside a carbon nanotube. The analysis showed that the surface tension affects the column inner pressure, and that the smaller the column diameter, the gre…
The presence of oxygen vacancies is considered to be the cause of various phenomena in ferroelectric thin films. In this work, the role of oxygen vacancies is theoretically modeled. Various properties are numerically simulated using the two-dimensional Ising model. In the presence of an oxygen vacancy in a perovskite…
Tensile tests on free-standing, 200-nm-thick Al films were conducted between room temperature and 200 °C. Applied strain rates were in the range 1×10−8–2×10−6/s. At a temperature of 200 °C a saturation of the flow stress was observed. The strain required to achieve steady-state saturation is of the order of 2×10−3, wh…
The valence band dispersions for Bi2Se3 have been determined using angle resolved photoelectron spectroscopy. The experimentally determined band dispersions are compared with theoretical band structure calculations. In general, good agreement between experiment and theory was found. However, energy bands in the Γ-Z di…
This work examines the material characteristics and magnetic properties of hexagonal M-type barium ferrite (BaFe12O19) films deposited by pulsed laser ablation deposition onto (111) magnesium oxide substrates at different oxygen growth pressures. X-ray diffraction data showed the lattice constant of the film grown at…
Experimental results showing that the surface of ferromagnetic materials is spontaneously magnetized by tribological actions such as friction and wear in the absence of external magnetic fields are presented. The magnetization mechanism of the frictional surface and wear particles is discussed based on the results of…
A fast Q-tensor method, which can model the configuration of the liquid crystal director fields containing defects, is proposed. Conceptually based on the Oseen–Frank approach, we have added temperature energy density terms in addition to the strain energy term. We have also derived an improved normalization method fo…
Time-dependent density functional theory (TDDFT) calculations were performed on the excitation energies and oscillator strengths of fully π-conjugated zinc oligoporphyrins. The TDDFT calculated results for the Q bands of the triply meso-meso-, β-β-, and β-β-linked zinc oligoporphyrins can well reproduce the significan…
The distribution of mobile charge carriers in the space-charge regions at grain boundaries of ceramic materials was modeled. Delocalization effects are neglected, i.e., we consider ionic defects or polarons. The calculations were performed for cubic-shaped grains of equal size. When considering the size dependence, th…
The molecular structures of Zr[(mu-H)(3)BH](4) and U[(mu-H)(3)BH](4) have been investigated by density functional theory (DFT) calculations and gas electron diffraction (GED). The triply bridged bonding mode of the tetrahydroborate groups in the former is confirmed, but both DFT calculations and GED structure refineme…
Not double Dutch! The resolution of racemates with families of structurally related resolving agents (see examples depicted) is termed Dutch Resolution. Certain family members are regularly not incorporated; these turn out to be nucleation inhibitors. This leads to a simplified, two-component resolution procedure with…
The structure of the γ-, δ-, ε-, and ξ-isomers and the bonding in the α-, β-, γ-, δ-, ε-, and ξ-isomers of [Mo 8 O 26 ] 4- isopolyanions have been calculated using density functional theory. The optimized structures are in reasonably good agreement with those determined experimentally with the exception of the γ-form.…
Transmission electron microscopy was applied to study ZnO grown by metalorganic vapor phase epitaxy on Al2O3(0001) substrates. The defect structure of the material is dominated by an extraordinary high density of small stacking faults with extensions between 5 and 25 nm which induce a bright small-scale speckle contra…