Materials Literature
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The typical island distance $\ell$ in submonlayer epitaxial growth depends on the growth conditions via an exponent $γ$. This exponent is known to depend on the substrate dimensionality, the dimension of the islands, and the size $i^*$ of the critical nucleus for island formation. In this paper we study the dependence…
The three-dimensional coordination polymers [{( n -C 4 H 9 ) 3 Sn} 3 M(CN) 6 ] (M = Fe, Co) were synthesized by slow interdiffusion of aqueous solutions of K 3 [M(CN) 6 ] and THF solutions of (C 4 H 9 ) 3 SnCl. The structures were determined by single-crystal X-ray crystallography (M = Fe, cubic, P 4 1 32, a = 17.338(…
Highly ordered macroporous materials with uniform pore size of the micrometer scale are known to have important technological uses such as photonic band-gaps and optical stop-bands. However, they can only be produced through adequate treatment of ordered monodisperse macroemulsions. Here, we report how a small amount…
A synthetic strategy has been developed for preparation of NLO chromophores with all the π-conjugated methine groups incorporated into plane-rigidified, fused, six-membered rings. The comparison of the rigidified chromophores to the analogous nonrigid chromophores shows that the configuration-locking methods provide a…
The molecular deformation of ultrahigh-molecular-weight polyethylene monofilaments was monitored in real time by remote laser Raman microscopy (ReRaM). A shift to lower wavenumbers of the symmetric and asymmetric C−C stretching mode bands, was observed in agreement with previously published data. The stress or strain…
Aquabis(3-butenoato)calcium, Ca(C 4 H 5 O 2 ) 2 (H 2 O) ( 1 ), the monomeric precursor for a new solid-state polymerization reaction, was synthesized from 3-butenoic acid and calcium carbonate. Irradiation of solid 1 with 60 Co γ-rays (305 kGy dose) leads to high molecular weight calcium poly(3-butenoate), M̄ w = 400…
Silver(I) complexes of [9]aneS 3, [15]aneS 5, and [18]aneS 6 have been used as templates for the self-assembly of polyiodide ions. The complexes [Ag 2 ([15]aneS 5 ) 2 ]I 12, [Ag([18]aneS 6 )]I 7, [Ag([18]aneS 6 )]I 3, and [Ag([9]aneS 3 ) 2 ]I 5 have been synthesized and structurally characterized. In [Ag 2 ([15]aneS 5…
Two kinds of 1:1 manganese complexes a and b of bis(hexafluoroacetylacetonato)manganese(II) coordinated with diazodi(4-pyridyl)methane ( 1 ) were prepared. Complexes a and b crystallize in the orthorhombic space group Pbca and in monoclinic C 2/ c, respectively. Two pyridyl nitrogen atoms from two different molecules…
Using pulsed laser deposition (PLD), metastable perovskite YMnO3 films were grown from a hexagonal YMnO3 target. The stabilization of the metastable phase is a result of the structural similarity between it and the perovskite substrates. X-ray and electron diffraction confirm the films' epitaxial nature but evince tha…
We employ effective mass theory for degenerate hole-bands to calculate the acceptor binding energies for Be, Mg, Zn, Ca, C and Si substitutional acceptors in GaN and AlN. The calculations are performed through the 6$\times $6 Rashba-Sheka-Pikus and the Luttinger-Kohn matrix Hamiltonians for wurtzite (WZ) and zincblend…
The surface modes of a composite consisting of aligned metallic wires with square cross sections are investigated, on the basis of photonic band structure calculations. The effective long-wavelength dielectric response function is computed, as a function of the filling fraction. The dependence of the optical absorptio…
The Zeeman splitting of the donor spectra in cubic- and hexagonal-GaN are studied using an effective mass theory approach. Soft-core pseudopotentials were used to describe the chemical shift of the different substitutional dopants. The donor ground states calculated range from 29.5 to 33.7 meV, with typically 1 meV hi…
ZnO nanoparticles of about 30−60 Å size in ethanolic solution were etched by addition of anhydrous acetic acid. Upon dissolution, the volume-weighted particle size decreased by about 10%. The polydispersity increased slightly. The dissolution rate was strongly dependent on particle size, and size selective etching of…
This review summarizes recent work in nanostructured insulating materials that contain optically active lanthanide ions. These materials find applications in lasers, optical amplifiers, and optical-display phosphors. This review concentrates on the synthesis and luminescence spectroscopy of lanthanide-containing nanos…
To verify our model for the local-mode-coupled low-energy excitation of the oxygen in silicon [H. Yamada-Kaneta, C. Kaneta, and T. Ogawa, Phys. Rev. B 42, 9650 (1990)], we have performed high-resolution far-infrared absorption measurements for the oxygen lines at 29.3, 37.7, 43.3, and 48.6 ${\mathrm{cm}}^{\mathrm{\ens…
The crystal structures of the title compounds, [Ce(C5H7O2)3(C12H8N2)], (1), and [Pr(C5H7O2)3(C12H8N2)], (2), have been determined. There are two independent molecules in the asymmetric unit of (1) but only one molecule in the asymmetric unit of (2). In both compounds the metal atom is eightfold coordinated by six O an…
Single crystals of V6O13 were grown by chemical vapour transport (CVT) and subsequently electrochemically lithiated. The title compound, trilithium hexavanadium tridecaoxide, was the phase formed during electrochemical lithiation at 2.45 V versus Li/Li+. The Li3V6O13 structure comprises single and double layers of VO6…
Biaxial stress in diamond film deposited on titanium coated copper substrate is investigated. Raman spectra show that with an increase in the film thickness, the diamond Raman line shifts from higher wave numbers to lower, approaching 1332 cm−1. Fitting the experimental plot of the in-plane stress σx versus the film t…
The structure and magnetic properties of the rf-sputtered Fe/Ti multilayers with the fixed Ti-layer thicknesses (series 1: tTi=1 nm and series 2: tTi=2 nm) and the variable Fe-layer thicknesses (1 nm⩽tFe⩽6 nm) have been studied by the high-angle x-ray diffraction, transmission electron microscopy, conversion electron…
The current transport mechanism through porous silicon (PS) films fabricated from 8 to 12 Ω cm p-type silicon (p-Si) substrates has been investigated using current–voltage I(V) measurements on metal/PS/p-Si/metal devices in the temperature range of 77–300 K. The characteristics for all devices show a rectifying behavi…