Materials Literature
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Abstract Samples of Sr 2 FeMoO 6 were prepared by a solid‐state reaction method in an ambient gas of strictly controlled oxygen content. These materials show a room temperature magnetoresistance of 2% in a magnetic field of 1.5 T. The double perovskite phase Sr 2 FeMoO 6 is stable at low oxygen partial pressure. In ai…
Si 3 N 4 powders were sintered using a 28 GHz gyrotron source, with Y 2 O 3 , Al 2 O 3 , and MgO as sintering aids, in an attempt to investigate the effect of microwave radiation on densification behavior. The microwave‐sintered samples were compared with identical samples produced by conventional pressureless sinteri…
A general theory of multilayers with enhanced reflectance has been developed based on the superposition of sub-quarterwave layers of various highly radiation-absorbing materials. The theory has been developed by second-order expansion of the multilayer reflectance with respect to the optical-constant differences betwe…
Abstract Extensive use of cement and concrete is envisaged in the construction of geological disposal facilities for radioactive wastes. The hyperalkaline porefluids typical of groundwaters that have reacted with these materials have the potential to react chemically with other engineered barrier components such as be…
Functional aliphatic polycarbonates with pendant allyl groups were synthesised by copolymerization of carbon dioxide and allyl glycidyl ether (AGE) in the presence of a catalyst system based on ZnEt2 and pyrogallol at a molar ratio 2 : 1. The functionality of some polycarbonates was reduced by replacing a part of ally…
Ferromagnetic transition in three-dimensional double-exchange models is studied by the Monte Carlo method. Critical temperature T c is precisely determined by finite-size scaling analysis. Strong spin fluctuations in this itinerant system significantly reduce T c from mean-field estimates. By choosing appropriate para…
High-resolution transmission electron microscopy (HRTEM), electron energy-loss spectroscopy (EELS), and electron diffraction were used to study the microstructure of epitaxial La0.5Sr0.5CoO3−∂ thin films grown on (001) oriented LaAlO3 substrates. Films were characterized before and after annealing treatments under dif…
Abstract Curing characteristics of blends of a hydroxyl‐functionalized dendritic hyperbranched polymer (HBP) and a triglycidyl p‐amino phenol (TGAP) epoxy resin have been studied. THe HBP strongly enhances the curing rate owing to the catalytic effect of the hydroxyl groups. THe thermal and dynamic viscoelastic behavi…
The crystal structure and composition of nuclei for graphite spheroids in a ductile cast iron containing small amounts of magnesium and traces of aluminium have been studied in a transmission electron microscope equipped with EDX and parallel electron energy loss spectrometer and in an electron microprobe analyser. Th…
In the present investigation optical microscopy, in combination with sputtered neutral mass spectrometry (SNMS), has been used to examine the conditions for initiation of pitting corrosion in the heat affected zone (HAZ) of two super martensitic (SM) stainless steel weldments. It is shown that the corrosion resistance…
Superparamagnetisch werden die hier beschriebenen Triblock-Copolymer-Nanoröhren durch Behandlung mit Fe2O3. Die dabei erhaltenen Polymer/Fe2O3-Hybridnanofasern (siehe TEM-Aufnahme) zeigen interessantes Verhalten im Magnetfeld. So ordnen sich die Nanofasern in Magnetfeldrichtung an, und bei Mischungen der Nanofasern un…
Radar absorbing materials are designed and developed with carbon fibers and suitable matching layers. Complex permittivities of carbon fiber composite are predicted on the basis that the modulus of permittivity obeys a logarithmic law of mixtures and the dielectric loss tangents are related through a linear law of mix…
We report measurements on dielectric properties of a nematic liquid crystal in planar aligned cells with two different thicknesses (1.2 and 6.7 μm). The nematic has a wide thermal range and the temperature variation of the effective dielectric constant (ε⊥) of the thick cell reflects that of the orientational order pa…
Evaluation of the creep behaviour of 2.25Cr–1Mo and 9Cr–1Mo ferritic steel base metals, 9Cr–1Mo steel weld metal, and 2.25Cr–1Mo/9Cr–1Mo ferritic–ferritic dissimilar weld joints has been carried out at 823 K in the stress range 100–260 MPa. The weld joint was fabricated by shielded metal arc welding using basic coated…
Abstract Silk and wool fibers were acylated with two acid anhydrides, dodecenylsuccinic anhydride (DDSA) and octadecenylsuccinic anhydride (ODSA), at 75°C with N,N ‐dimethylformamide (DMF) or dimethyl sulfoxide (DMSO) as the solvent, the latter of which allowed higher weight gains to be reached. The weight gain and ac…
High‐temperature‐resistant ceramics in the system Mo‐Si‐O‐C were prepared from polymethylsiloxanes loaded with MoSi 2 filler. Irreversible structural rearrangement reactions in the polymer‐derived Si‐O‐C matrix phase and at the filler‐matrix interface during heat treatment were detected by in situ electrical resistanc…
Over the years, an enormous amount of experimental results have been reported on damage accumulation (e.g. void swelling) in metals and alloys irradiated under vastly different recoil energy conditions. Unfortunately, however, very little is known either experimentally or theoretically about the effect of recoil energ…
The crystal structures and chemical compositions of hydroxy-hydrated borate oxysalt minerals are interpreted in terms of the bond-valence approach to the structure and chemistry of oxysalts developed by Schindler & Hawthorne (2001). The grand mean Lewis basicity of structural units in hydroxy-hydrated borate minerals…
Thermomechanical effects in hybrid and cylindrical-hybrid oriented nematic liquid crystals (NLC), as well as thermomechanical effects in NLC with a homogeneous director distribution induced by quasistatic or light electric fields, are observed and investigated theoretically and experimentally. It is postulated that th…
The curing and mechanical properties of nitrile (NBR) and natural rubber (NR) blends were carried out. Two series of blends were prepared, i.e., NBR/SMR L and NBR/ENR 50 blends. Blends were prepared using a Brabender at a temperature of 60°C. Results indicate that the scorch time, t 2 and cure time, t 90 increase with…