Materials Literature
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In order to examine the fission gas release behavior under restraint conditions, an out-of-pile high pressure annealing technique was applied to UO2 fuels irradiated to 37GWd/t in a BWR. The irradiated fuels were annealed at temperatures of 1,500–1,800°C and external pressures of 10–150MPa. The fractional release of 8…
The trapping of hydrogen by various interfaces in iron and steels has been studied. The hydrogen content of pure iron specimens was found to depend more on hydrogen than those of low angle, and thus specimens with low angle grain boundaries were less susceptible to hydrogen damage. Inclusions and thermo-mechanical tre…
Photochromic ring-closure reactions of diarylethene derivatives with terthiophene (T3H, T3Me) have been examined by femtosecond transient absorption spectroscopy. The rate of the ring-closure reaction of T3H in n-hexane was estimated to be ∼ 2.5 ps, which is very similar to that of T3Me in the same solvent. It was sug…
The method of electrical dislocation density measurement, which was successful in plastically deformed pure noble metals, is applied for the first time to dilute alloys, and the parameters for the electrical dislocation density measurement, i.e. the temperature dependence of the deviation from Matthiessen's rule and o…
Abstract Layered perovskite compound RbLa2Ti2NbO10 has been successfully characterized by the Rietveld analysis of powder X-ray diffraction pattern and lattice energy calculation. The RbLa2Ti2NbO10 represents a unique example of layered perovskite in which equal numbers of Ti4+ and Nb5+ cations were statistically dist…
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…