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Abstract Rb 3 As 11 und Cs 3 As 11 wurden aus den Elementen synthetisiert und die Kristallstrukturen der geordneten Raumtemperaturmodifikationen auf der Basis von Röntgen‐Einkristalldaten bestimmt. In den Zintl‐Phasen bilden die As‐Atome chirale Ufosan‐Anionen As mit As‐As‐Abständen im Bereich zwischen 238 und 248 pm.…
Abstract Die Caesium‐Lanthanoid‐Thiosilicate CsM[SiS 4 ] (M = Sm — Tm) kristallisieren allesamt orthorhombisch in der nichtzentrosymmetrischen Raumgruppe P2 1 2 1 2 1 mit vier Formeleinheiten pro Elementarzelle. Ihre Gitterkonstanten bewegen sich in Bereichen von a = 630 — 640 pm, b = 665 — 673 pm und c = 1763 — 1778…
View the article online for updates and enhancements.You may also like Electrochemical growth of ZnSe thin films, characterization and heterojunction applications Hatice Asl Uurlu and Yldray Hamurcu - Electrochemical Deposition of n-Type ZnSe Thin Film Buffer Layer for Solar Cells P. Prabukanthan and G. Harichandran -…
The origin of observed positive core-level shifts in sparse Au clusters on oxides is explored in representative metal oxide systems, namely, Au/MgO(001) and ${\mathrm{A}\mathrm{u}/\mathrm{T}\mathrm{i}\mathrm{O}}_{2}(110)$ with a varying coverage and also in the presence of surface oxygen vacancies, by using the densit…
New Ca 3 - x Th x Mn 2 O 7 ( x = 0−0.2) compounds with the Ruddlesden−Popper structure have been synthesized. Their crystal structures were refined from X-ray powder diffraction data, taking into account a small orthorhombic (space group Cmcm or Cmc 2 1 ) distortion of the parent tetragonal I 4/ mmm structure. Doping…
Abstract Bi 37 InBr 48 wurde in Form schwarzer Kristalle aus Bismut, Indium und BiBr 3 durch langsames Abkühlen stöchiometrisch zusammengesetzter Schmelzen von 570 K auf 470 K dargestellt. Aus Röntgenbeugungsuntersuchungen an Pulvern und Einkristallen geht hervor, dass die Verbindung in der Raumgruppe P 6 3 kristallis…
Polymethylmethacrylate (PMMA) colloids sterically stabilized by a layer of chemically grafted poly-12-hydroxystearic (PHSA) are widely used in experiments as model hard spheres. However, due to the coating, the interaction between particles is slightly soft. Here we report a numerical study of the effect of the PHSA c…
Abstract The crystal structure of the ζ 2 ‐phase Al 3 Cu 4‐δ was determined by means of X‐ray powder diffraction: a = 409.72(1) pm, b = 703.13(2) pm, c = 997.93(3) pm, space group Imm2 , Pearson symbol oI24‐3.5 , R I = 0.0696. ζ 2 ‐Al 3 Cu 4‐δ forms a distinctive a × √3 a × 2 c superstructure of a metal deficient Ni 2…
Crystals of copper(II) arsenate NaCuAsO(4) were grown by conventional high-temperature, solid-state methods in molten-salt media. The compounds were characterized by single crystal X-ray diffraction, UV-vis spectroscopy, and magnetic susceptibility measurements. NaCuAsO(4) crystallizes in a monoclinic lattice with a =…
We employ mean-field lattice density functional theory to investigate the phase behavior of a binary $(A\ensuremath{-}B)$ mixture confined to nanoscopic slit pores with chemically homogeneous walls. We consider only nearest-neighbor interactions in symmetric mixtures, where ${\ensuremath{\epsilon}}_{\mathrm{AA}}={\ens…
High-resolution x-ray diffraction and ac-calorimetric experiments have been carried out on the liquid-crystal octyloxycyanobiphenyl in which aerosil particles are dispersed. The measurements were made over a temperature range around the bulk nematic to smectic-A transition temperature. At this transition the liquid cr…
Amine-templated vanadium sulfates of the formula [HN(CH(2))(6)NH][(V(IV)O)(2)(OH)(2)(SO(4))(2)].H(2)O, I, [H(3)N(CH(2))(2)NH(3)][V(III)(OH)(SO(4))(2)].H(2)O, II, and [H(2)N(CH(2))(4)NH(2)][(V(IV)O)(H(2)O)(SO(4))(2)], III, have been prepared under hydrothermal conditions. These vanadium sulfates add to the new emerging…
We demonstrate that negative refraction occurs for both cw and pulsed electromagnetic waves when traversing from a "right-handed" (index > 0) to a "left-handed" (index < 0) material (LHM) which has causal dispersive intrinsic properties. We also demonstrate that a divergent line source spaced a distance H in front of…
Abstract CuX (X = Cl, CH 3 COO) bzw. AgOC(O)C 6 H 5 und GaCl 3 reagieren in THF mit S(SiMe 3 ) 2 bzw. Se(SiMe 3 ) 2 in Anwesenheit von PPh 3 zu [Cu 6 Ga 8 Cl 4 S 13 (PPh 3 ) 6 ] ( 1 ), [Cu 6 Ga 8 Cl 4 Se 13 (PPh 3 ) 6 ] ( 2 ), [Ag 6 Ga 8 Cl 4 S 13 (PPh 3 ) 6 ] ( 4 ) und [Ag 6 Ga 8 Cl 4 Se 13 (PPh 3 ) 6 ] ( 5 ). Verwen…
A novel sandwich-type compound, Na12[Fe4(H2O)2(As2W15O56)2]·41H2O, has been synthesized. The compound was well-characterized by means of IR, UV-vis, 183W NMR and elemental analyses. The compound crystallizes in the triclinic, Pī symmetry group. The structure of the compound is similar to that of Na16[M4(H2O)2(As2W15O5…
Building bridges: Fumed colloidal silica can be dissolved in alkaline aqueous solutions of the open-chain sugar alcohols mannitol, xylitol, and threitol. These polyols are able to form six-coordinate silicon complexes that are stabilized by intramolecular hydrogen bonds. The prototypical core is shown (yellow bars: th…
We develop a theory for frictional drag between two 2D hole layers in a dilute bilayer GaAs hole system, including effects of hole-hole and hole-phonon interactions. Our calculations suggest significant enhancement of hole drag transresistivity over the corresponding electron drag results. This enhancement originates…
A recently developed theory of collective diffusion in colloidal suspensions is tested regarding the quantitative accuracy of its description of the dynamics of monodisperse model colloidal systems without hydrodynamic interactions. The idea is to exhibit the isolated effects of the direct interactions, which constitu…
We report the results of an x-ray scattering study where both the dynamic and the static properties of a liquid crystal (8OCB) near the nematic-smectic A phase transition were probed. The static, time-averaged data show the gradual formation of smectic layers in the nematic phase, and we find that the smectic order co…
Measurements of the orientational order parameter of dissolved dichroic dyes are reported for two smectic-A liquid crystals that tilt in the presence of an in-plane electric field without any decrease in the layer spacing. The dye order parameter is determined by measuring the anisotropic absorption of linearly polari…