Materials Literature
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A novel cylindrical mirror analyser (CMA) has been used to obtain true spectra using Auger electron spectroscopy (AES) on Au, Ag and Cu. The whole energy distribution for the primary accelerating voltages, ranging from 1 V through to 5000 V, was measured absolutely. Even faint spectra which have not been cited in Auge…
Two new crystalline charge-transfer salts of BEDT-TTF [bis(ethylenedithio)tetrathiafulvalene] containing hexachlorometallate anions of 5d elements have been synthesised, characterised structurally and their magnetic and conducting behaviour investigated. α-(BEDT-TTF) 4 [ReCl 6 ]C 6 H 5 CN is triclinic [P; a=9.455(2),…
The applicability of ASTM Test Method for Shear Strength of Continuous Fiber-Reinforced Advanced Ceramics at Ambient Temperatures (C 1292) was investigated to determine the shear strength of one-dimensional and two-dimensional continuous fiber-reinforced ceramic composites. The advantages and disadvantages of the test…
The frequency of occurrence of paint chips and glass fragments on the outer clothing and footwear of 213 high school students from different areas of the city of Vancouver was determined. Paint and glass respectively were found on ca. 14% and 2% of the outer clothing items, and on ca. 24% and 5% of footwear. These fig…
3 The chemical bonding at a grain boundary of an Fe-doped SrTiO bicrystal 3 has been determined by a combination of spatially resolved electron energy-loss spectroscopy and a first-principles molecular-orbital calculation. The near-edge structure of the O K-edge spectrum on the boundary shows that the manner of the Ti…
13 C NMR spin–lattice relaxation times T 1 are used to investigate the effect of low molecular weight diluents, including N,N-dimethylformamide, N-methylformamide, propylene carbonate, γ-butyrolactone, triglyme and tetraglyme, on the local polymer segmental motion in polyether–urethane networks. In all cases, an incre…
The synthesis and characterization of cis- and trans-[Fe(cyclam)Cl2]+ (cyclam = 1,4,8,11-tetraazacyclotetradecane) are described. The assignment of geometrical configuration to these complexes has been made on the basis of their infrared spectra in the 800–900 cm–1 region. In addition, the molecular structures of the…
The complex dielectric responses of various La-modified lead zirconate titanate ceramic specimens have been measured under various ac drive and dc bias conditions. Investigations were performed for different La concentrations on specimens with Zr/Ti ratios of 40/60 and 65/35. These investigations demonstrated that the…
Twelve new compounds α2-MaHb[P2W18 – nTinO62]·xH2O and α-1,2,3-MaHb[P2W18 – n(TiO2)nO62 – n]·xH2O (M = K+, NEt4+ or NBu4+; n = 1, a + b = 8; n = 3, a + b = 12) were synthesized from vacant heteropolytungstate precursors α2-[P2W17O61]10– and α-1,2,3-[P2W15O56]12–. The products were characterized by IR, UV spectroscopy,…
The ligand orientations in the nonplanar porphyrin complexes 1a–e and 2a–e have been investigated using molecular mechanics calculations and proton NMR spectroscopy. The minimum energy structures calculated for complexes 1a–e show that the planes of the axial pyridine or imidazole ligands are orientated approximately…
Abstract The influence of water vapour on the oxidation of Ti‐50 at.% Al was studied at 900°C. Thick, well‐adherent oxide scales were formed consisting of an outer TiO 2 layer and an inner heterogeneous mixture of TiO 2 and Al 2 O 3 . The interface between these layers is marked by large pores and Al 2 O 3 particles e…
The use of a precursor-based synthetic method, namely, the freeze-drying of acetic acid solutions, allows the preparation, at temperatures as low as 600 °C, of single phase perovskites in the solid solution series La 1-x K x MnO 3+δ . This soft treatment of the precursors yields products constituted of homogeneous nan…
Description STP 1326 features the most current information from the world's leading experts on innovative methods describing the physical properties and oxidative behavior of polymers, lubricants and petrochemicals. 18 comprehensive papers, including two key-note addresses, are divided into two major categories: Oxida…
We studied the structure and the magnetic properties of the oxygen deficient perovskite ${\mathrm{PrBaCuFeO}}_{5+\mathrm{y}}$ as a function of the removable oxygen y. The average crystal structure was refined from x-ray and neutron powder diffraction data which both confirm the presence of the additional oxygen y in t…
We use dynamic light scattering to measure the dynamic structure factor of density fluctuations occurring in colloidal suspensions that have attained a quiscent state long after aggregation. We find a stretched-exponential decay to a finite plateau. Our interpretation of the arrested decay is that these systems are ge…
The fracture energies of glassalumina interfaces were measured using the bimaterial bend test. These experiments comprise one of the few studies in which the bimaterial bend test has been applied to an all‐ceramic materials system. The experiment was used to evaluate the effect of materials purity, processing and envi…
A model system was developed for the in vitro quantitative investigation of the calcification process occurring in heart valves. The process of heart valve calcification consists of the formation of calcium phosphates at the heart valve-biological fluid interface. Calcium phosphate deposits may consist of more than on…
Powders of Nb and C mixed in various mole fractions (C=10–80 mol%) have been ground in a planetary ball mill. When thus mechanically activated mixtures were transferred into a graphite crucible and exposed to air, they ignited spontaneously and self-propagating high-temperature synthesis (SHS) took place. NbC, Nb2C an…
Eight polyazomethine polymers were synthesized with different backbone structures and side groups attached. Five of these polymers, with high melting point, were subjected to DC conductivity (σ) measurements versus temperature change (300–500K). The annealed samples show consistent behaviour. The [log σ] versus [1/T]…
A family of related compounds of general formula (PPh 4 ) 2 Mn 2 [Cu(L)] 3 · n H 2 O have been synthesized, where PPh 4 + is the tetraphenylphosphonium cation and L stands for o -phenylenebis( N ‘-benzyloxamidate) (PhMe 2 opbox) ( 1 ), o -phenylenebis[ N ‘-(3-phenylpropyl)oxamidate] (PhPr 2 opbox) ( 2 ), and o -phenyl…