Materials Literature
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Nuclear fuel can be fabricated and used in the form of microspheres (sphere-pac fuel). The heat transport mechanisms in fuel pins containing sphere-pac fuel are however very different from those in pellet pins. They are controlled not only by the thermal conductivity of fuel, cladding, and fill gas but also by particl…
Heavy-atom alkanethiolates (mercaptides), especially of lead, provide a series of sharp first-order lines for calibrating both wide- and small-angle X-ray diffractometers (WAXD and SAXS), out to at least 60 Å d spacing. There is no reliance on published data or on externally validated substances other than silicon sta…
Ultra-small-angle X-ray scattering by dislocations in single-crystal aluminum has been observed in situ as a function of plastic deformation. The scattering is strongly dependent upon sample orientation, with single dislocations, dislocation dipoles, and the dislocation distribution within walls each exhibiting distin…
A study is reported on phase transitions in the La 1− x Sr x MnO 3 system, both spontaneous and induced by a pulsed magnetic field of up to 250 kOe, accompanied by anomalies in magnetoelastic properties. The temperatures of the polaron (charge) and magnetic ordering, as well as those of structural transitions, are obs…
The method of optical enhancement by means of intersurface-reflection-excited resonance was applied to a single-pixel device filled with a fast-switching electroclinic mixture M68. A contrast ratio of 6.5: 1, which is sufficient for a spatial light modulator (SLM), has been obtained for an electric-field-induced twist…
A new procedure of recording both Hugoniot parameters and stress profile is proposed to study shock characteristics of polymers in 1 GPa stress region. The assembly consists of an in-material polyvinylidene fluoride (PVDF) stress gauge element and an optical prism pin. The PVDF gauge records the shock wave stress prof…
This work addresses the influence of the prepolymerization of the catalyst particle on the fluidized bed reactor for polyethylene production. The influence of prepolymerization on the temperature and concentration gradients throughout the reactor was studied. The results obtained through simulations confirm industrial…
Results are presented of a study dealing with an AlN–TiN composite material for high temperature applications. Hardness, microhardness, compressive strength, electrical resistance, and thermal conductivity of the material were measured at room temperature and flexural strength was measured at temperatures from 20 to 1…
Crystal structures of [Pd(NH3)2X2] complexes, where X = Br or I, diamminediiodo-/-dibromopalladium(II), have been studied by X-ray powder diffraction. The series consists of five complexes: cis-[Pd(NH3)2Br2] (I) [a = 13.3202 (7), b = 12.7223 (6), c = 7.05854 (3) A, Z = 8, space group Pbca], trans-[Pd(NH3)2Br2] (II) [a…
BICUVOX ionic conductors with enhanced electrical conductivity were produced through a new route of synthesis, using powders obtained from melting. Compositions with the general formula Bi4V(2-x)MexO(11-x) with x varying from 0.07 to 0.20 were investigated using this new process, and high electrical conductivity was o…
Hydrothermally prepared La2(SeO3)3 contains a three-dimensional network of LaO10 polyhedra [dav(La—O) = 2.622 (3) Å] and SeO3 pyramids [dav(Se—O) = 1.691 (3) Å]. One of the SeO3 pyramids is in a general position and the other has crystallographic m symmetry. There are pseudo-channels in the [010] direction which are…
We computed via first-principles density functional theory calculations (employing both the local density and generalized gradient approximations) the dimensions, bond lengths and angles, binding energy, and HOMO–LUMO gap of the following hypothetical neutral hollow octahedral molecules: B48H24, C48H48, C96H80 (formed…
A method founded on the follow-up of an electromagnetic cavity resonant frequency working round 390 MHz has been carried out in order to measure the void rates of bubble field induced by a 308 kHz ultrasonic cavitation in liquids. This method can detect void rates as low as 2 × 10−5. The experimental set up permits to…
In order to explain the stabilised shape memory behaviour observed during the thermal and mechanical cycling of a Cu–14·86Zn–5·81Al–0·5Fe (wt-%) alloy, X-ray diffraction and optical microscopy studies have been performed. The former have shown that the previously reported reorientation of the α brass phase crystallite…
In the title compound, poly[cobalt(II)-bis(μ-hydroxyacetato-O1,O2:O1′)], [Co(C2H3O3)2]n, units of [Co(C2H3O3)2] constitute a bidimensional sheet coordination polymer in which each CoII atom lies on an inversion centre and is octahedrally coordinated to glycolate ligands in a trans configuration. Carbonyl O atoms fro…
The ‘marriage’ between porphyrin chemistry and the newly emerging molecular recognition science has opened up novel research opportunities leading to many biological and abiological applications. An overview of this fascinating research area is presented here.
Single crystals of digadolinium monooxygen diselenide, Gd2OSe2, have been obtained from a KBr flux. The compound is isostructural with the low-pressure form of Dy2OS2. All atoms lie on the mirror plane of Pnma. The Gd environments are a GdO3Se5 bicapped trigonal prism and a GdOSe5 distorted octahedron. The two coordi…
Abstract A series of bis(β‐diketonato)tin compounds have been systematically synthesized and examined as precursors for chemical vapor deposition of SnO 2 thin films. These complexes were characterized by elemental analyses and NMR, IR and mass spectroscopic methods. X‐ray single‐crystal determination of Sn(tfac) 2 re…
The dehydroxylation of 10 Å halloysite from the Wellin (Weillen) cryptokarst (southern Belgium) was studied in situ by applying infrared emission spectroscopy. Dehydroxylation is evidenced by the loss of the OH-stretching modes between 3600 and 3700 cm-1. A slow decrease of all intensities up to ± 500 °C is observed f…
The space-group symmetry of a crystal has a simple form in Fourier space, which provides a natural language for the basic facts about x-ray extinctions and band sticking in nonsymmorphic crystals.