Materials Literature
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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.
We present a model to explain the planar-homeotropic anchoring transition of azobenzene induced by UV illumination via trans-cis isomerization. We consider bulk and surface as two different phases (separated by an infinitely sharp interface) which are in equilibrium. We obtain a relation for the exposure time after wh…
Results obtained using the Brunauer-Emmett-Teller method, small-angle x-ray scattering and wide angle x-ray diffraction in the study of porous silicon are compared. The BET method seems to fail when the porosity of samples is smaller than 50%, giving unrealistically large values for the specific surface area, but givi…
This paper reports on materials whose second order nonlinear optical (NLO) properties can be switched by light. We synthesized and studied the properties of a series of substituted N-salicylidene anilines which are noncentrosymmetric and photochromic crystals. All compounds exhibit second harmonic generation (SHG). On…
Effect of alloy elements on corrosion of low alloy steel was studied under simulated offshore conditions. The results showed that the elements Cu, P, Mo, W, V had evident effect on corrosion resistance in the atmosphere zone; Cu, P, V, Mo in the splash zone and Cr, Al, Mo in the submerged zone.
As-spun poly(ethylene-2,6-naphthalate) (PEN) fibers (i.e., precursors) prepared from high molecular weight polymer were drawn and/or annealed under various conditions. Structure and property variations taking place during the treatment process were followed via wide-angle X-ray scattering (WAXS), small-angle X-ray sca…
Composite plates containing pine wood chips and high density polyethylene (HDPE) matrix were prepared and studied for their impact fracture behavior using an instrumented drop weight tester. Maximum load sustained, deflection to maximum load, energy to maximum load and energy for total penetration of the test specimen…
The structure of [Mg(H(2)O)(6)]SO(4) was redetermined at 120 K, confirming the hydrogen-bond pattern found at room temperature [Zalkin et al. (1964). Acta Cryst. 17, 235-240] but showing the librational corrections of bond lengths to be unrealistic.