Materials Literature
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The properties of starch plastic sheets were investigated by stress—strain measurements in relation with starch crystallinity. Granular potato starch was plasticized with different amounts of glycerol and water by extrusion. The materials were amorphous directly after processing. During aging above the glass transitio…
Without sticking to the surface rapeseed oil droplets roll around on a surface prepared in two steps: An aluminum plate is first anodically oxidized and then treated with fluorinated monoalkylphosphates. The contact angles for some polar oils on such surfaces are greater than 150°.
We report measurements of $^{10}\mathrm{B}$ stopping powers in random and Si 〈100〉 directions. The measurements were carried out in the 500--9000 keV energy range for the channeling case and in the 300--800 keV for the random one. For the channeling measurements, the low energy data (500--800 keV) follow a ${\mathrm{v…
Single crystals of V6O13 were grown by chemical vapour treatment; thereafter electrochemically lithiated. The title compound was the first phase formed during electrochemical lithiation at 2.65 V versus Li/Li+. The Li2V6O13 structure can be described as layers of VO6 octahedra stacked perpendicular to the c direction.…
Mineralologi, Krystallografi, Eudialyt, Kent brooksit, Mikrosonde analyse
Thick films (10–12 μm) of NiZn–ferrite (Ni0.6Zn0.4Fe2O4) were grown on single-crystal (100) magnesium oxide substrates using pulsed laser deposition (PLD). The morphology, phase, orientation, strain, and magnetic properties of the as-deposited films were investigated as a function of substrate temperature (400–700 °C)…
The fcc to bcc structural change in the growth of ultrathin iron films is studied for films grown on a (111) fcc surface, in an attempt to mimic the geometry of the martensitic transition in bulk iron, where the interface is formed from the close-packed planes of the two structures. The use of a 2-ML Ni/W(110) substra…
A previously proposed approach for the ab initio evaluation of Hubbard parameters is applied to BEDT-TTF dimers. The dimers are positioned according to four geometries taken as the first neighbors from the experimental data on the κ-(BEDT-TTF)2Cu[N(CN)2]Br crystal. RHF-SCF, CAS-SCF and frozen-orbital calculations usin…
We present a mathematical model to describe the optical phase shift induced by polymer dispersed liquid crystals (PDLCs) on light impinging transversely on the sample. PDLCs are dispersions of liquid crystal microdroplets in a polymeric binder. Droplets appear as optically uniaxial spheres randomly oriented so that th…
The effect of laser intensity on the deposition of diamondlike carbon (DLC) films has been studied using an ArF (193 nm) pulsed excimer laser. Our results are found to be distinct from other studies using Nd-YAG infrared or excimer 248-nm lasers. Two issues concerning the growth mechanism of the films are discussed: (…
Electronic and structural properties of transition-metal/${\mathrm{BaTiO}}_{3}$(001) interfaces are studied by first-principles local-density full-potential linearized augmented plane-wave calculations with slab models. Equilibrium interlayer separations between metal overlayers (for the 5d metals Ta, W, Ir, and Pt) a…
The diffusion of doubly charged nickel vacancies in a \ensuremath{\Sigma}5(310)[001] tilt grain boundary (GB) of NiO has been studied by molecular dynamics. The simulations are carried out in the NVT ensemble (constant number of particles, volume, and temperature) and the interatomic interactions are described by a ri…
The technical relevance of Rh, Pd, and Pt as catalysts used to reduce ${\mathrm{NO}}_{\mathrm{x}}$ pollutants has stimulated great interest in a detailed understanding of the chemisorption process of these systems. While experiment indicates Rh to be a better catalyst than the other transition metals, theory still doe…
A chair-within-a-chair arrangement of the twelve copper atoms (bottom left) is characteristic of one of the complexes reported here; the other complex features two Cu tetrahedra sharing a common vertex (bottom right). Both were isolated from the reaction mixture [Cu2(O2CMe)4(H2O)2]/(py)2CO in MeCN. Magnetic susceptibi…
Polarized fluorescence spectra produced by site-selective excitation, and conventional polarized absorption spectra were obtained for Tm3+ and Er3+ ions individually incorporated into single crystals of strontium fluorapatite, Sr5(PO4)3F, also known as SFAP. Substitution of the trivalent rare earth ion for divalent st…
A simple effective Hamiltonian for the electron-phonon coupling in the conjugated polymers is derived from the Su-Schrieffer-Heeger model with quantized lattice motions. Phonons correspond to lattice quantum fluctuations around the dimerized positions. Both acoustic and optical modes are considered. The energy-momentu…
The optical transitions of vanadium ${\mathrm{V}}^{4+}$(${3\mathrm{d}}^{1}$) on the hexagonal lattice site (h) of 6H-silicon carbide are studied by Fourier-Zeeman spectroscopy. The Zeeman splitting of the four zero-phonon lines is completely resolved. We first obtain the effective g factors from the Zeeman splitting.…
The natural mineral cetineite was prototype for the synthesis of the compound 1. Its nanoporous, template-free host structure is an idela object for numerous investigations. Electronic excitation and transport processes, for example, can be studied on this nanostructured semiconducting material. A part of the crystal…
The photoelectrochemical properties of a p-type silicon (100) electrode coated with tungsten oxide thin film were investigated as a function of annealing temperature. The variation in the annealing temperature affected the photocurrent of a WO3/p-Si electrode. A maximum photocurrent was obtained when the 500 Å WO3 thi…
Infrared transmission spectra were measured systematically in polycrystalline La1−xCaxMnO3−δ and several systems substituted by other rare earth (RE) ions such as Sm3+, Gd3+, Dy3+, etc., at La3+ sites or Fe ions at Mn sites but keeping the nominal Mn4+/Mn3+≈3/7. Two strong absorption peaks located around 600 and 350 c…