Materials Literature
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A previously reported multistep hot filament chemical vapor deposition process for nucleating diamond directly on nickel substrates has been further refined to increase the nucleation density and improve the orientation of diamond films. The process employed heavy seeding of both 〈100〉 and 〈111〉 oriented single crysta…
Phase diagrams of a set of three monodisperse polystyrene lattices in the presence of non-adsorbing polymer molecules (hydroxyethyl cellulose) have been determined. Polymer molecules induce reversible phase transitions involving gas, liquid and solid-like states. We find that the phase diagrams can have two distinct t…
Abstract Biodegradable thermoplastic composites reinforced with wheat straw fibers were prepared. The matrix was an expensive polyester, poly‐3‐hydroxy‐butyrate (PHB), produced by bacterial fermentation. Before being mixed with the PHB, the wheat straw fibers were subjected to a steam explosion process that induces mo…
Thin film optical waveguides of the chalcogenide glass Ga-La-S have been deposited on substrates of CaF2 and microscope glass by the technique of pulsed laser deposition. The chalcogenide properties of photobleaching, photodoping, and photoinduced refractive index changes have been observed and preliminary experiments…
The photoluminescence of porous silicon can be quenched by adsorbates, and the degree of quenching can be tuned by chemical derivatization of the porous silicon surface. Thus, as-prepared porous silicon has a hydrophobic, hydrogen-terminated surface, and the photoluminescence is strongly quenched by ethanol and weakly…
The simple model previously suggested is extended to the case of three-site intermetallics like the Heusler compounds. The behaviour of the lattice parameter in several sequences of compounds can be qualitatively understood by considering the changes in the relevant d-(or p)-site occupation number.
Discussing the design and optimum use of thermal analysis instrumentation for materials' property measurement, this work details how the instruments work, what they measure, potential pitfalls and the fitting of experimental results to theoretical models. It presents a tutorial on writing computer programs for data ma…
Steady state and time-resolved photoluminescence studies have been carried out for a new vibronic emission band, with a zero phonon line at 2.395eV, that is observed in type IIb semiconducting diamond. This band exhibits a relatively slow (228ns) photoluminescence decay that is exponential, and is believed to be due t…
The title structure comprises two ion pairs in each asymmetric unit. There are no close contacts between any of the ions. Although the structure determination was carried out at reduced temperature there are large vibration amplitudes for some F atoms and disorder in one of the n-butyl chains
The title molecule, 2,7,12,17-tetrakis(4-chlorophenyl)-21,22,23,24-tetraazapentacyclo[16.2.1.1 3,6 1 8,11 .1 13,16 ]tetracosa-1,3(22),4,6,8,10,12,14,16(24),17,19-undecaene, is crystallographically centrosymmetric and the dihedral angle between the two pyrrole ring planes is 5.0 (4) o . The molecular structure is a con…
Ca 2 (SiO 3 OH)(OH), M r =190.26, orthorhombic, P2 1 2 1 2 1 , a=9.487 (4), b=9.179 (4), c=10.666 (7) A, V=928.8 (8) A, Z=8, D x = 2.72 g cm -3 , λ(Mo Kα)=0.71069 A, μ=25.07 cm -1 , F(000)=768, T=293 K, final R=0.054 for 1677 unique non-zero reflections having I>3σ(I). The crystal was hydrothermally synthesized from a…
The NiO(100) Fuchs-Kliewer phonon spectrum has been investigated by high-resolution electron-energy-loss spectroscopy (HREELS) at beam energies of 0.8--17 eV and the intensity distribution of the phonons relative to the dielectric properties of the NiO substrate has been considered. Over most of the range, the spectru…
TlS is known as a mixed valence compound containing monovalent and trivalent thallium ions. The structure of the newly found monoclinic TlS has been analyzed using three-dimensional single crystal diffraction data. Space group C2: a =11.018(6), b =11.039(15), c =60.16(7) Å, β=100.69°(4) and Z =128. The structure is ch…
A detailed investigation of the magnetic properties of single crystals of the two-dimensional layered Heisenberg antiferromagnet MnPS3 and pyridine intercalated MnPS3 by static magnetic susceptibility and electron paramagnetic resonance (EPR) is reported. A detailed analysis of the angular and temperature variation of…
A systematic study of the structural and magnetic properties of the RMo1.5Fe10.5Nx series, where R is Y, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, or Er, has been carried out using x-ray diffraction, magnetic measurements, and the Mössbauer effect. The 1-12 phase with Ce and Pr has been successfully stabilized. PrMo1.5Fe10.5Nx…
Abstract The factors that influence the morphology and the interfacial parameters during dynamic vulcanization of hydrogenated nitrile rubber/nylon blends are examined. The particle size of the dispersed phase ( R̄ ) and the correlation distance (ξ) of a 50 : 50 blend decreased with increasing mixing time at 250°C, at…
The structure of Cu(110)-(2\ifmmode\times\else\texttimes\fi{}3)N has been investigated with x-ray reflectivity measurements of nine independent surface rods. Observed reflectivities ranging over five orders of magnitude were compared with calculations based on structural models. A pseudo-(100) reconstruction consistin…
Zinc (Zn) is doped into GaSe single crystals grown by the Bridgman technique in a wide range from 0.005 to 0.5 at. % to the stoichiometric melt. Radiative recombination mechanisms have been investigated by using photoluminescence (PL) measurements. The PL spectra in Zn-doped samples at 77 K are dominated by three emis…
We use the field-theoretical methods to derive the self-consistent one-loop equations (Hartree approximation) for the location of the critical point in binary mixtures of polymers. The small parameter in the loop expansion is the inverse of the square root of the number of segments (monomers) in a polymer chain 1/√N.…
Neutron-diffraction data and magnetization measurements of compacted nanophase Cr are presented. Two crystalline Cr phases were found, the majority phase having a bcc structure and the minority phase having an A15 structure. The 100 Bragg reflection seen in antiferromagnetically ordered coarse-grained bcc-Cr polycryst…