Materials Literature
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Description Compiles the latest information in fracture mechanics research from the world's leading scientists and engineers in the field. In addition to an extensive overview of applied fracture mechanics as it pertains to pressure vessels safety, STP 1256 features 42 peer-reviewed papers that cover: Constraint Crack…
The double flash technique of F. K. Dolezalek and W. E. Spear (1975, J. Phys. Chem. Solids, 36, 819) for the measurement of recombination coefficients was used to determine the recombination mechanism of drifting electrons and holes in stabilized a-Se (Cl-doped a-Se: 0.3% As). The experiments show that the recombinati…
We present a detailed study of the interaction of nitric oxide (NO) with the reconstructed (5 × 1) and metastable (1 × 1) surfaces of Ir{100} using vibrational spectroscopy and low-energy electron diffraction (LEED). Despite certain similarities with the corresponding Pt system, for example in the adsorbate-induced li…
Two series of polypropylenes with different molar mass—reactor grade (RE) and peroxide-degraded (CR) types—were investigated with respect to mechanical and crystallization parameters. A significant influence of the production process on mechanical parameters was found, which can be attributed to differences in the cry…
An unhydrated phase of the potassium intercalate of the hydrated vanadium oxides in Part 1 has been synthesized in a hydrothermal VO(OH)2–KCl system. It is formulated as K0.5V2O5 and adopts the monoclinic system C2/m with a= 11.688(2)Å, b= 3.668(1)Å, c= 9.505(2)Å and β= 92.24(1)°. A single-crystal structure analysis r…
Novel compounds and metal complexes containing both ferrocene and sulfur-based ligands have been prepared and their properties investigated. The reaction of [NEt4]2[Zn(C3S5)2] with (Chloromethyl)ferrocene led to the compound 4,5-bis(ferrocenylmethylsulfanyl)-1,3-dithiole-2-thione. Similarly, the reaction of the salt C…
A method is described for improving the possibility and sensitivity of measurements of electromechanical properties of ferroelectric thin layers. This method is especially useful for investigating electrostrictive properties. A nonlinear model for the description of the electrical conductivity is presented. First resu…
The insulation system of HV apparatus deteriorates due to partial discharges (PD). PD tests are carried out successfully in shielded laboratories to verify the insulation quality and to rectify defects left during the manufacturing process. A variety of techniques exists for this purpose. It is also desired to monitor…
Vanadium substituted Sm/sub 10/(Fe,V)/sub 90/ alloys were prepared by a single roller rapid-quenching method. The melt-spun Sm/sub 10/Fe/sub 82.5/V/sub 7.5/ alloy showed the TbCu/sub 7/-type structure for a wide range of wheel speeds between 15 and 50 m/s, while the Sm/sub 10/Fe/sub 90/ binary alloy showed the same st…
SrTiO 3 thin films are grown on MgO(001) substrates at growth temperatures between 600-800° C and at oxygen pressures between 10 -1 -10 -6 Torr. The initial stage of growth is controlled by graphoepitaxy with a cube-on-cube orientation. In the growth temperature range from 600° C to 740° C, graphoepitaxy occurs only a…
The formation of a six-coordinate FeIII TMP–hydrogen peroxide complex (TMP = tetramesitylporphyrin), having a nitrogenous ligand at the axial position, is demonstrated by means of simultaneous EPR and optical absorption measurements at 77 K.
Thin films of iron oxide, nickel oxide and cobalt oxide have been grown by the technique of laser ablation. The films have been deposited on [100] LaAlO/sub 3/, SrTiO/sub 3/, MgO and cubic zirconia (YSZ); on sapphire, mica, glass slides and Kapton. High quality c axis [100] oriented growth occurs for Fe/sub 3/O/sub 4/…
Abstract In this study, blends of virgin and recycled polyethylene (PE) and poly(vinyl chloride) (PVC), with a methylmethacrylate‐ethylacrylate copolymer as a processing aid, were prepared in the molten state. Different additives such as ethylenevinylacetate copolymers, ethylene‐methacrylic acid ionomer, and two perox…
The crucial role of electron spin in the control of the reaction channels in the region of activated complexes can easily be inferred from the general principles of chemical bonding. Magnetic perturbations could change spin at the intermediate stages of a reaction or in the region of activation barriers and could henc…
Using transmission electron microscopy, we have compared the domain configurations in epitaxial, ferroelectric PbTiO3 films grown on different substrates and to different film thicknesses. These configurations change considerably between the different samples. In addition, we have characterized the film/substrate inte…
Ester elimination between Sn(OBUt)4 and Sn(OAc)4 in refluxing toluene yields Sn6(O)6(OCMe3)6(O2CMe)6 which is characterized in solution and in the solid state by single-crystal X-ray diffraction; reaction of the same species in pyridine results in the formation of the ligand exchange products, Sn(OBut)X(OAc)4–x where…
Abstract We present results of computer simulations by the method of Brownian dynamics of polymeric brushes attached to impenetrable planes. For testing both model and method we have used one polymer brush attached to a repulsive plane and compare some results with Monte Carlo results of Lai and Binder on the bond flu…
The purpose of this study is a search for compositional ranges available to replace expensive heavy rare-earth elements (Gd, Dy) by a cheaper element such as Nd on keeping the heat resistance. The equilibrium phase diagrams of magnesium-rich portion of ternary alloys are made. Investigated compositional ranges are les…
Excellent transparent YAG ceramics, which contain Nd additives from 1.2 to 7.2 at%, were fabricated by the solid-state reaction method using high purity powders (>99.99 mass%) of Al2O3, Y2O3 and Nd2O3. The precipitated phase (Y1-δNdδAlO3) in accordance with increase in Nd content was clearly observed in Nd: YAG cerami…
Whiskers and powder of silicon nitride were prepared by the carbothermal reduction and nitridation of diatomaceous earth in the presence of flowing N 2 and NH 3 . The optimum temperature for the formation of Si 3 N 4 whiskers was 1350°C and the yield reached almost 20% after 24 h. The α‐Si 3 N 4 content decreased with…