Materials Literature
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[Zn(C 44 H 28 N 4 )(H 2 O)] cristallise dans I4/m avec a=13,425, c=9,6994 A, Z=2; affinement jusqu'a R=0,043. Cette structure a ete reetudiee afin de mesurer, avec plus de precision, le deplacement du zinc par rapport au plan de la porphine. Ainsi, ce deplacement est de 0,173 A. Le zinc n'est coordine qu'a une seule m…
The magnetic structure factors determined using polarized neutron scattering are employed to analyze the magnetic-moment distribution of Fe in ${\mathrm{Fe}}_{3}$(${\mathrm{Al}}_{\mathit{x}}$${\mathrm{Si}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$) alloys. The spherical and aspherical parts of the distributions are not mu…
Low-energy electron transmission experiments were performed for two types of amorphous films (solid amorphous and molten amorphous films) of tetratetracontane [${\mathrm{CH}}_{3}$(${\mathrm{CH}}_{2}$${)}_{42}$${\mathrm{CH}}_{3}$]. The temperature dependence of the transmission spectra and the spectral changes due to t…
The concept of competition-during-heating as a mechanism for TL supralinearity and sensitization in TLD-100 is re-examined. It is demonstrated that with this model it is not necessary that the competing traps be removed by radiation in order for supralinearity to be obtained. Furthermore, the arguments for and against…
Yttrium oxide (Y2O3) thin films were deposited on indium-tin-oxide(ITO)-coated glass substrates by the radio-frequency-sputtering method using an Y2O3-sintered target. The relative dielectric constant εr and the dielectric strength EBD of the Y2O3 films were studied. It was found that εr and EBD have a maximum value a…
Using an expansion of \ensuremath{\sim}2870 plane waves, we have performed ab initio calculations of the energy bands, equilibrium lattice constants and atomic positions, and cohesive energy of ${\mathrm{B}}_{12}$. We find an indirect gap of 1.427 eV and a direct gap of 1.780 eV. The lattice constants and atomic posit…
cis-Bis-neodecanoato-trans-R,R-1,2-diaminocyclohexaneplatinum++ +(II) (NDDP) is a liposome dependent cisplatin analogue since the liposome carrier is required for its i.v. administration and for its biological activity. A Phase I study of liposome entrapped NDDP (L-NDDP) was performed using a single i.v. injection eve…
The second harmonic generation (SHG) coefficients dij of several corona-poled guest-host and side-chain polymers have been measured and studied over time using a new Maker Fringe analysis. The electro-optic coefficient r33 and scattering losses have also been measured in thin-film waveguides, on silicon and glass subs…
Transport and optical properties of n-type CdSe crystals together with microanalysis of residual impurities from two different sources (A and B) were investigated and compared in detail. It was found that the electronic properties of the crystals are governed by two kinds of shallow donors. At low temperatures (T150 K…
We have measured, as a function of temperature, the thermopower, the dc conductivity, and photoconductivity of ${\mathrm{FePS}}_{3}$ single crystals. For temperatures below 430 K the thermopower shows an activated behavior, whereas at higher temperatures it is almost temperature independent. The dc dark conductivity a…
The photoluminescence (excitation, emission, and fluorescence decay time) spectra of spinel (Ti:MgAl2O4) excited by pulsed Nd:YAG and dye lasers have been systematically investigated. Excitation into the T2g→Eg crystal-field transition of Ti3+ produces a broad infrared emission band at 805 nm which could, in principle…
The fundamental issue of ``bands versus bonds'' in metal oxides is addressed through the direct comparison of results from scattered-wave cluster-molecular-orbital and augmented-spherical-wave band-structure calculations for zinc oxide and copper-impurity systems therein. It is shown that there is a close corresponden…
The Bhatia-Thornton and Faber-Ziman partial structure factors (PSF) for liquid ${\mathrm{Al}}_{80}$${\mathrm{Ni}}_{20}$ have been determined by neutron diffraction from samples of different Ni isotopic enrichment. From the comparison with the PSF of the liquid ${\mathrm{Al}}_{80}$[${\mathrm{Mn}}_{\mathit{x}}$(FeCr${)}…
The freezing phase transition in a binary suspension of colloidal hard spheres of diameter ratio α=0.61 was studied by light scattering and scanning electron microscopy. The suspensions consisted of sterically stabilized poly(methyl methacrylate) spheres of diameters about 670 and 407 nm suspended in a near refractive…
The first measurements are reported for the frequency-dependent ac conductivity for the iron bismuthate glassy semiconductors in the frequency range ${10}^{2}$--${10}^{5}$ Hz and in the temperature range 80--450 K. The experimental data have been analyzed with reference to various theoretical models based on quantum-m…
Spin-polarized measurements of the two-dimensional angular correlation of annihilation radiation in NiMnSb are presented. By making use of the inherent partial polarization of the positron beam and the alignment of the magnetic domains with the aid of an external magnetic field, the sum and difference of the spin-depe…
Using a basis set of \ensuremath{\sim}3580 plane waves, we perform ab initio self-consistent calculations of the energy bands and cohesive energy of ${\mathrm{B}}_{12}$${\mathrm{C}}_{3}$. Calculating stresses and forces, both the lattice constants and the positions of the atoms in the unit cell are determined. If trig…
Type-IIA diamond single crystals containing approximately 0.1%, 0.5%, and 1% $^{13}\mathrm{C}$ were synthesized and their thermal diffusivities were measured at room temperature by the thermal-wave-mirage technique. The measured value (18.5 ${\mathrm{cm}}^{2}$/s) of the 0.1% $^{13}\mathrm{C}$ crystal was 50% higher th…
Reports the observed variation of electrical resistivity with thickness of tin oxide films grown by spray pyrolysis. An explanation for the observed variation is also given.
Highly orientated films of the transition metal dichalcogenides 2H-MoS 2 , 2H-WS 2 , 2H-TaS 2 and 3R-NbS 2 have been prepared using a suspension of the powders in water. The layered material is collected at the water/organic interface by shaking the suspension with a water-immiscible organic liquid. The films are spre…