Materials Literature
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We report, for the first time, epitaxial growth of high-quality ZnS films on sapphire and silicon substrates, using pulsed laser deposition. X-ray diffraction results show that at all growth temperatures from 200 °C to 680 °C, epitaxial wurtzite (002) ZnS films have been successfully grown on (10 2) sapphire and (001)…
The relative stabilities of the following phases: graphite-C3N4, α-C3N4, β-C3N4, cubic-C3N4 and pseudo-cubic-C3N4 have been determined using density functional theory in its local density approximation. In particular three calculational methods were imployed: augmented spherical wave, linear muffin-tin orbitals and fu…
The dielectric relaxation times characterizing the rotations around the molecular short axis in the nematic (τ‖) and isotropic (τis) phases of several liquid crystalline cyanophenyl compounds are re-analysed with the aim of obtaining the retardation factor g‖ and then the nematic potential q and the order parameter S.…
Porous silica film with a median pore size of 5.5 nm was exposed to an oxygen plasma afterglow. The exposure resulted in a removal of hydrophobic organic groups from the silica surface, leading to a continuous increase in the refractive index and a decrease in film thickness. The exposure to the thermal oxide did not…
The Shubnikov-de Haas (SdH) effect in Sb 2- x Ti x Te 3 single crystals was investigated as a function of Ti content for 0< x <0.02 at T = 4.2 K in high magnetic fields up to 40 T applied along the c 3 -axis. We found that by doping Ti into Sb 2 Te 3 , the cross-section of the six-ellipsoidal Fermi surfaces of the upp…
Using the biomimetic method, we formed a hydroxyapatite (HAp) layer on/in certain types of nonionic hydrogels that contain hydroxyl groups. The hydrogels used were poly(vinyl alcohol) (PVA), poly(2-hydroxyethyl methacrylate) (PHEMA), poly(glucosyloxyethyl methacrylate) (PGEMA), and agarose. Under an optical microscope…
The [VOCl4]2–/AgOAc reaction system in MeCN gives [V5O9Cl(OAc)4]2–, [V9O19(OAc)5]3– and [V15O36]5– for reagent ratios of 1∶2, 1∶3 and 1∶4, respectively: the V5 and V9 cores are fragments of the V15 core, suggesting the V5 and V9 units are carboxylate-stabilised intermediates in the assembly of the V15 polyoxovanadate.
Abstract Effectively luminescent organic polymers were successfully fabricated by incorporating deuterated hexafluoroacetylacetonato Nd(III) or Eu(III) complex and DMSO-d6 in polyalkylmethacrylate matrices with low percentage of H atoms.
The localized corrosion properties of and , were investigated in the amorphous, high strength partially nanocrystalline, and fully crystalline states. The critical pitting potentials and pit growth behaviors of amorphous and nanocrystalline alloys were improved compared to high purity, polycrystalline in solution. Tra…
Finite element modeling treats magnetization processes within the framework of micromagnetic theory, taking into account the complex microstructure of a magnet. The numerical integration of the Gilbert equation of motion provides the time evolution of the magnetization and thus shows how reversed domains nucleate and…
The TeO 2 -rich part of the TeO 2 -Nb 2 O 5 system has been investigated by temperature programmed X-ray diffraction and differential scanning calorimetry. Three invariant equilibria have been observed: one eutectic reaction (8 mol% NbO 2.5 , T E =690±5 °C, L E TeO 2 +Nb 2 Te 4 O 13 ), one peritectic reaction (incongr…
The cationic distribution in the iron substituted manganites Bi 2 Mn 4– x Fe x O 10 (0≤x≤1) has been investigated combining X-ray powder diffraction (XRPD), magnetic susceptibility measurements and 57 Fe Mössbauer spectroscopy. Iron is at the trivalent state and exhibits, like Mn 3+ the high spin configuration. It is…
New temperature-dependent inelastic X-ray scattering (IXS) and Raman scattering (RS) data are compared with each other and with existing inelastic neutron scattering (INS) data in vitreous silica, in the 300-1775 K region. The IXS data show collective propagating excitations up to Q = 3.5 nm−1. The temperature behavio…
This paper reports the observation of large undamped voltage oscillations during the anodic polarization of silicon in electrolyte containing a combination of acids. One of them stimulates oxide growth and the other its chemical dissolution (in the present case, . This temporal patterning of the anodization process is…
Preservation of laminations in hemipelagic and pelagic sediments is routinely attributed to reduced oxygen conditions that inhibited benthic activity. As such, the degree of preservation of laminae is used commonly as a paleo-oxygenation indicator. Recent evidence from deep-sea pelagic sediments in the eastern equator…
X-Ray diffraction is reported from mesoporous silicate films grown at the air/water interface. The films were studied both as powdered films, and oriented on silicon or mica sheets. At early stages of growth we observe Bragg diffraction from a highly ordered cubic phase, with both long and short d-spacing peaks. We ha…
The synthesis, optical and electrical properties of azobenzene-substituted polythiophene derivatives at the 3-position are reported: one without flexible spacer (PT0) and the other with a hexamethylene spacer (PT6). Photoirradiation of PT6 at 366 nm caused trans-cis isomerization of the azobenzene moiety and this phot…
The complex [Cd3(dien)2(NCS)6]n·nH2O (dien = diethylenetriamine) is prepared and characterised by X-ray diffraction studies, which show a new type of three-dimensional polymeric structure having cadmium centres which are linked to each other via NCS bridges in such a way that two types of Cd environment (one involving…
Intercalated layered double hydroxides (LDHs) of chromate (CrO42–) and dichromate (Cr2O72–) have been synthesised and characterised. The parent chloride material ([Ni–Al–Cl]) was obtained by coprecipitation at constant pH and further anion-exchanged to incorporate the desired oxo-anions. The physico-chemical propertie…
Measurements of partial discharge (PD) are used to examine the insulation characteristics of HV equipment. This test method is also suitable for low-cost components in mass production. To monitor the quality of prefabricated parts, products and production processes, short test cycles and automatic classification are i…