Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The program TWINLAW reads two orientation matrices obtained from a non-merohedrally twinned crystal and evaluates the twin law. In a second step, the program HKLF 5 uses this twin law to generate a reflection file for refinement with the HKLF5 option of the SHELXL program. The use of both programs is demonstrated by m…
A detailed phase diagram of Pb(Mg 1/3 Nb 2/3 ) (1− x ) Ti x O 3 , conventionally abbreviated to PMN-PT, has been constructed around the morphotropic phase boundary from measurements taken from one single crystal possessing a composition gradient. Optical birefringence imaging was employed as a function of temperature…
Hen egg-white lysozyme (HEWL) crystals have been studied by means of double-crystal synchrotron topography. The crystals reveal a number of features that are quite well known in hydrothermally grown inorganic crystals: dislocations, growth bands and growth sector boundaries. Dislocations in the 〈110〉 sectors have been…
A wire-mesh honeycomb (WMH) catalyst was constructed from alternating layers of flat and corrugated wire-mesh sheets packed within a frame. The wire-mesh sheets were first coated with aluminum particles using an electrophoretic deposition method. The coated layer was suitably porous and showed a good adherence to the…
The accuracy of the weight fractions calculated with the Rietveld method for various polycrystalline systems using data collected for very short times (5–45 min) with an RTMS (real-time multiple strip) detector was verified. The weight estimates were compared with those obtained using the same conventional Bragg–Brent…
The diffraction line broadening due to lattice-parameter variations caused by a position-dependent (spatial) scalar variable ( e.g. the composition) was analysed theoretically. It was shown that the anisotropy of the resulting microstrain-like line broadening depends on the symmetry of the crystal system of the phase…
In this report a neutron protein crystallography station (PCS) is described that has been built at Los Alamos National Laboratory for the study of proteins using the wavelength-resolved Laue technique. This user facility is the first of its kind to be built at a spallation neutron source and the first to use the wavel…
The self-diffusion coefficient D and the viscosity η of low molecular weight polystyrene (1.9 × 10 3 g/mol) have been measured from T g + 3 °C to T g + 160 °C. Forward recoil spectrometry (FReS) and pulsed-gradient spin-echo NMR methods were combined to determine D values covering more than 10 orders of magnitude. Ove…
The recursive description of stacking in layered crystals, originally developed by Treacy et al. [ Proc. R. Soc. London Ser. A (1991), 433 , 499–520] and implemented in the DIFFaX code, is enclosed in a non-linear least-squares minimization routine and combined with additional models (of specimen-related broadening an…
An atomic pair distribution function (PDF) neutron powder diffraction round-robin experiment was performed on six diffractometers at three spallation sources. Instrument-specific effects on the real-space PDF were investigated, such as finite measurement range, the instrument resolution and the asymmetric shape of dif…
Alumina/poly(methyl methacrylate) (PMMA) nanocomposites were synthesized using 38 and 17 nm alumina nanoparticles. At an optimum weight fraction, the resulting nanocomposites display a room-temperature brittle-to-ductile transition in uniaxial tension with an increase in the strain-to-failure that averages 40% strain…
The electrochromic properties of electrodeposited poly(1,4-bis(2-[3‘,4‘-ethylenedioxy]thienyl)-2-methoxy-5-2‘ ‘-ethylhexyloxybenzene) (P(BEDOT-MEHB)), a material for polymer electrochromic displays, are reported in detail. While the polymer is transparent in the fully oxidized state, two absorption bands obtained in t…
The magnetic and transport properties of Dy 1− x Sm x Mn 6 Ge 6 ( x = 0.2–1.0) have been investigated using x-ray diffraction (XRD) and magnetization measurements. Analysis of the XRD patterns indicates that the samples with x ⩽ 0.4 mainly consist of the HfFe 6 Ge 6 -type phase and the samples with 0.6 ⩽ x ⩽ 1.0 mainl…
<div class="htmlview paragraph">Considering the benefits associated with use of Gasoline doped with Ethanol, viz, cleaner environment, energy security, boost to agrarian economy, opening of new avenues of employment in rural sector, Government of India mandated the use of 5% Ethanol blended Gasoline (henceforth…
Microphase separation in crosslinked diblock copolymers is investigated with a time-dependent Ginzburg–Landau model. Upon separation, polymers originally crosslinked in the homogeneous phase elongate parallel to the composition gradient. We take into account this elastic coupling as well as the random stress caused by…
The emission and excitation spectra of CaS:Pb thin films have been obtained at 10 K together with the emission decay curves. The CaS:Pb samples were prepared with the variation of the concentration and the spatial uniformity of active Pb 2+ ions within the CaS host matrix using atomic layer deposition (ALD) and tetrae…
Abstract The structure and physicomechanical properties of nylon 6 (N‐6) modified with polyethylene oxide–polyisoprene–polyethylene oxide (PEO‐PI‐PEO) copolymers via activated anionic polymerization have been investigated by using differential scanning calorimetry (DSC), wide‐angle X‐ray diffraction (WAXD), thermograv…
The effect of annealing on magnetic and transport properties in La 0.5 Sr 0.5 CoO 3−δ thin films is studied. The samples were prepared by annealing amorphous films at different temperatures. With increase in annealing temperature, the resistivity decreases, and the Curie temperature ( T c ) and negative magnetoresista…
The local atomic order of an amorphous Ga50Se50 alloy produced by mechanical alloying (MA) was studied by the extended x-ray absorption fine structure (EXAFS) and x-ray diffraction (XRD) techniques and by reverse Monte Carlo (RMC) simulations of its total x-ray structure factor. The coordination numbers and interatomi…
The whisker of polyoxymethylene produced in the cationic polymerization process of trioxane is a single crystal of extended chain crystal morphology. Since it has a quite small size of several microns in radius and several tens of microns in length, the crystal structure analysis of POM whisker had been tried by using…