Materials Literature
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The pressure dependence of the Curie temperatures of the Fe 2 P-type intermetallic compounds MnRhP, MnRhAs and MnRhAs 0.6 P 0.4 was investigated up to 8 GPa. For MnRhAs both the Curie temperature T C and the temperature T t of the transition from AF I to the canted state increased with pressure. However, T t decreased…
The catalytic effects of copper-based alloys in diamond growth have been investigated. A single crystal of diamond has been obtained by the temperature gradient method (TGM), using Cu–Mn–Co and Cu–Co alloys as catalysts. It was found that the melted Cu–Mn–Co and Cu–Co alloys show low viscosity. The eutectic temperatur…
The paper develops a one-dimensional magneto-elastic model of a magnetostrictive fiber actuated polymer matrix composite material which accounts for a strong viscoelastic response in the polymer matrix. The viscoelastic behavior of the composite polymer matrix is modeled with a three parallel Maxwell element viscoelas…
Abstract An exact matrix polynomial series solution for oblique propagation in a cholesteric liquid crystal, reported in this journal some years ago, was numerically implemented. After a slight reformulation, it was found that numerical results can be accurately and quickly obtained with a simple desktop computer. Wit…
Raman results for different single-walled carbon nanotube bundles doped with Br 2 were studied both at ambient pressure and under high pressure up to 6 GPa. Our study indicates that bromine resides in the interstitial channel of nanotube bundles as a form of polymer.
It is well known that, when a stationary vapor bubble is subject to a sufficiently intense acoustic field, it will grow by rectified heat transfer even in a subcooled liquid. The object of this paper is to study how translation, and the ensuing convective effects, influence this process. It is shown that, depending on…
Decaborane, a molecular boron hydride, was compressed to 131 GPa at room temperature to explore possible non-molecular phases in this system and their physical properties. Decaborane changed its colour from transparent yellow to orange/red above 50 GPa and then to black above 100 GPa, suggesting some transformations.…
In this paper we report a theoretical study of the static dipole polarizability of two one-dimensional structures: (a) linear carbon chains ${\mathrm{C}}_{n}$ $(n=2\ensuremath{-}10)$ and (b) ladderlike planar boron chains ${\mathrm{B}}_{n}$ $(n=4\ensuremath{-}14).$ The polarizabilities of these chains are calculated b…
Despite great technological importance and many investigations, a material with a measured hardness comparable to that of diamond or cubic boron nitride has yet to be identified. Our combined theoretical and experimental investigations led to the discovery of a new polymorph of titanium dioxide, where titanium is nine…
In this paper, we report a theoretical study of the hydrogen abstraction reactions from ethylbenzene by a series of imide-N-oxyl radicals. Geometry optimizations and vibrational frequencies were performed using density functional theory at the B3LYP/6-31G(d,p) level. Single-point energy calculations were carried out a…
The pressure behaviour of a series of transition metal borides has been studied both experimentally and by means of ab initio calculations. X-ray diffraction patterns measured up to ∼50 GPa for VB 2 and ZrB 2 show no obvious phase transition. Bulk moduli of 322 and 317 GPa, respectively, were obtained using a Murnagha…
The title compound, Na2SeO3, contains two crystallographically different Na+ ions, Na1 and Na2. Na1 is coordinated by four monodentate and one chelating SeO32− group, while two monodentate and two chelating selenite ions are attached to Na2. For both Na+ ions, a strongly distorted octahedral coordination results. The…
The charge-density-wave (CDW) transition temperature, T CDW , of ZrTe 3 is found to increase for pressures up to 0.6 GPa, while the superconducting transition temperature, T c , decreases with increasing pressure. According to a band calculation, it is found that the pressure-induced enhancement of the CDW and suppres…
A new intermetallic compound, Mn 3 Ge, has been synthesized by direct reaction of elemental components at 6.2 GPa and 1000°C for 30 min using a belt-type high-pressure apparatus. The compound crystallizes into a cubic structure with the space group Pm 3 m , namely the L1 2 -type (Cu 3 Au-type) structure. The structure…
Sonoluminescing single bubbles driven simultaneously by two harmonic frequencies were recently reported to increase the maximum light output up to a factor of 3 with respect to single mode excitation. In this paper, experimental and numerical results on single-bubble sonoluminescence (SBSL) in an air/water system usin…
On the basis of phase equilibria, the lowest temperatures, T min , above which at high pressures cubic boron nitride crystallization from melt solution is allowable in terms of thermodynamics have been found for a number of systems that include boron nitride.
The effect of various substituents on the hydrolysis and condensation reactions, the initial stages of the mechanism to form silsesquioxanes, are investigated with ab initio electronic structure theory including electron correlation effects. In addition, the role of water molecules on the mechanism is also discussed.
The synthesis of MCM-41-type materials functionalized with 3-mercaptopropyl(methyl) and/or methyl groups has been performed by co-condensation of the corresponding alcoxysilanes and tetramethoxysilane in the presence of CTAB and different amino acids. The presence of the organic moieties in the resulting material has…
The syntheses and structures of the novel Ce-Fe bimetallic complexes [[Fe(sal)2(bpy)]2Ce(NO3)(H2O)3].EtOH and [[Fe(sal)2(bpy)]4Ce2(H2O)11][salH]2.EtOH.3H2O (salH2 = salicylic acid) suggest Fe(3+)-sal2- units and Ce-OC(R)O-Fe bridging contribute to the formation of corrosion inhibitive layers on steel surfaces exposed…
Crystalline boron nanowires with tetragonal structure have been synthesized based on laser ablation of a B/NiCo target; the nanowires are sometimes single crystals and have a droplet at one end of the nanowire; the droplet contains B, Ni and Co elements, which indicates that the vapor-liquid-solid (VLS) mechanism may…