Materials Literature
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A microsieve with a very uniform pore size of 260 nm and a pore to pore spacing of 510 nm has been fabricated using multiple exposure interference lithography and (silicon) micro-machining technology. The sieve consists of a 0.1 µm thick silicon nitride membrane perforated with sub-micron diameter pores and a macro pe…
The dependence of the Raman line width in diamonds on the nitrogen impurity is experimentally studied. A linear relation between the nitrogen content and the width is found. It is demonstrated that the slope of the linear fit depends on the type of nitrogen defect. A relation between the Raman experiment and results f…
Orange and red phosphorescence from was clearly observed after exciting with ultraviolet (UV) light. The phosphorescence properties for were investigated with a fluorescence photometer. The phosphorescence was due to to and to transitions of ions and it lasted more than . It is suggested that trapped‐electron and hole…
The selection of the armour materials for the Plasma Facing Components (PFCs) of the International Thermonuclear Experimental Reactor (ITER) is a trade-off between multiple requirements derived from the unique features of a burning fusion plasma environment. The factors that affect the selection come primarily from th…
The reaction of Nd2S2O, TiS2 and S at 1000 °C and subsequent chemical transport with I2 yields the new crystalline layered oxysulfide Nd2Ti2S2O5 that possesses a defective Sr3Ti2O7 structure whose cuboctahedral sites within the double-perovskite layers are empty; Nd2Ti2S2O5 is paramagnetic and semiconducting; the synt…
A series of derivatives M 2 P 2 ( M 2 ≡ H 4 , Co 2 , Ni 2 , Cu 2 , Zn 2 , Pd 2 , Pt 2 , Co / Ni , Ni / Cu , Ni / Zn ) of the ligand meso,meso′-bis(octaethylporphyrinyl)butadiyne has been prepared and characterized by 1 H NMR, FT Raman and visible absorption spectroscopies as well as by cyclic and a.c. voltammetry in C…
We consider the following generalization of strongly regular graphs. A graph G is a Deza graph if it is regular and the number of common neighbors of two distinct vertices takes on one of two values (not necessarily depending on the adjacency of the two vertices). We introduce several ways to construct Deza graphs, an…
Copper zinc oxide catalysts are effective for the ambient temperature carbon monoxide oxidation and display higher specific activity than the current commercial hopcalite catalyst.
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High performance Sm/sub 2/Fe/sub 17/N/sub 3/ magnet powder is developed by a reduction and diffusion method. Typical remanence, coercivity and maximum energy product obtained are 1.40 T, 1.13 T and 323 kJ/m/sup 3/, respectively. Decreasing samarium content, oxygen content and the amount of /spl alpha/-Fe are found to…
The viability of applying UHF partial discharge monitoring techniques to an in-service oil-filled power transformer is established. Discharges in oil are shown to radiate the high frequency signals necessary to allow detection. On-site pulse injection is used to test the operation of a UHF coupler fitted to the transf…
The reactions of PhP(O)(OH)2 or Ph2P(O)OH with Ti(OPri)4 in DMSO give the soluble tetranuclear complexes [Ti4(µ3-O)(OPri)5(µ-OPri)3(PhPO3)3]·DMSO 1 or [Ti(µ3-O)(OPri)(Ph2PO2)]4·0.5DMSO 2, the first examples of phosphonato- and phosphinato-bridged titanium oxo alkoxides, which have been characterised by single-crystal…
Applied to the new iron(II) compound Fe(t-msbpy)2(NCS)2 (t-msbpy=4-methyl-4′-trans-styryl-2,2′-bipyridine), a novel strategy based on the so-called '‘ligand-driven light-induced spin change’' (or LD-LISC) effect, which consists in triggering the metal ion electronic spin-state crossover in a complex by a photochemical…
The effects of microstructure on the hydrogen trapping ability and effective diffusivity in steels with different carbon content have been studied. The sites for trapping hydrogen in pure iron, ferrite/pearlite steel, and the martensitic structure etc. have been identified. The hydrogen pick‐up was generally increased…
X-Ray photoelectron spectroscopy (XPS) analysis was used to verify the structure of nanosized overoxidized polypyrrole (OPPy) films that were grown on glassy carbon. The films were electrochemically grown to ca. 1.2–1.6 nm thickness from acetonitrile with tetrabutylammonium perchlorate (TBAP) and from water with adeno…
Electrospray mass spectrometry (ESMS) has been performed on aqueous solutions of dilute (10–3 M) isopolyoxomolybdate systems. There is direct evidence that the evaporation process in the ESMS technique involves significant chemical effects, resulting in the detection of many new anions and cations. For ammonium polyox…
Structural changes stimulated by ultraviolet (UV) irradiations of sol–gel-derived indium oxide thin films were investigated. Illumination of incoherent UV photons (4.9 eV) from a low-pressure mercury lamp resulted in formation of crystalline indium metal. Irradiation of coherent UV beams from an ArF excimer laser (6.4…
At 1100 K a new phase of WO 3 with space group P 4/ ncc , a = 5.2885(5) Åand c = 7.8626(8) Å, was established, and its crystal structure was determined. The previously known tetragonal phase P 4/ nmm , which is shown to exist only above 1170 K, was also refined with a = 5.3031(4) Åand c = 3.9348(3) Åat 1200 K. The dif…
Mechanical milling of initially ordered ferromagnetic ${\mathrm{SmCo}}_{5}$ produces dramatic increases in coercivity after short (15 min to 1 h) milling times, accompanied by remanence ratios on the order of 0.7 and shifted hysteresis loops. X-ray diffraction shows that milling induces both chemical and structural di…
Abstract Although most industrial drying and separation technologies are based on transport of multiple components, a convenient and practical means of describing multicomponent diffusion over wide temperature and concentration ranges has not been developed for polymer solutions or even for simple liquid mixtures. We…