Materials Literature
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We discuss pinning properties of MgB2 thin films grown by pulsed-laser deposition (PLD) and by electron-beam (EB) evaporation. Two mechanisms are identified that contribute most effectively to the pinning of vortices in randomly oriented films. The EB process produces low defected crystallites with small grain size pr…
We use Schwinger boson mean field theory to study the antiferromagnetic spin-1/2 Heisenberg model on an anisotropic triangular lattice in the presence of a uniform external magnetic field. We calculate the field dependence of the spin incommensurability in the ordered spin spiral phase, and compare the results to the…
The degree of circular polarization ($\wp$) of the non-linear emission in semiconductor microcavities is controlled by changing the exciton-cavity detuning. The polariton relaxation towards \textbf{K} $\sim 0$ cavity-like states is governed by final-state stimulated scattering. The helicity of the emission is selected…
Fundamentally new families of carbon single walled nanotubes are proposed. These nanotubes, called graphynes, result from the elongation of covalent interconnections of graphite-based nanotubes by the introduction of yne groups. Similarly to ordinary nanotubes, arm-chair, zig-zag, and chiral graphyne nanotubes are pos…
This paper presents a method that combines activity coefficient models with Hand's equation for tie lines. The proposed method calculates solute distribution in liquid-liquid ternary systems. The combination improves the calculated solute distributions using activity coefficient models while Hand's equation gives a go…
Several structural levels of plastic deformation (the superdefect zone, the quasidestructured region, the region with a high dislocation density, the peripheral zone and the region of elastic deformation) have been distinguished around microindentations of various crystal types. The real structure of the deformed zone…
Process tolerances for critical dimensions are becoming increasingly severe as lithographic technology drives the minimum integrated-circuit feature size toward 0.1 micrometers and below. In response, Optical Critical Dimension metrology (OCD), an optical-wavelength light-diffraction technique, is currently undergoing…
Diamond is considered a tissue-equivalent material since its atomic number (Z =6) is close to the effective atomic number of biological tissue (Z =7.42). Such a situation makes it suitable for radiation detection purposes in medical applications. In the present work the analysis is reported of the thermoluminescence (…
Abstract We see the current generation of area detector diffractometers as the heralds of a crystallographic revival, launching the renewal and revitalisation of the subject. Coupling these machines to appropriate software will enable chemists to undertake some of their own analyses, releasing structure analysts and c…
Article X-ray Crystal Structure Analysis in Manchester: from W L Bragg to the Present Day was published on July 1, 2002 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 217, issue 7-8).
Mixtures of sulphate-resistant Portland cement, Ca(OH) 2 and silica fume were moist cured at 55°C for approximately twelve months and subsequently reacted with 0·5 M MgSO 4 solution at 85°C for six months. Marker experiments in conjunction with electron microprobe analyses were used to elucidate reaction mechanisms. T…
The continuing reduction of IC device dimensions puts stringent demands on the corresponding overlay performance. As part of the total overlay budget, the effects of the different process parameters need to be characterized and well understood. In a joint development program between IMEC and ASML, the robustness of di…
Far-infrared, mid-infrared, and Raman spectroscopy were used to characterize iodine-doped poly(isothianaphthene) (PITN) films and powders. The far-infrared and mid-infrared results show changes from absorption mode to reflective mode as the doping level increases, consistent with the iodine-doped PITN becoming more me…
The ultraviolet (UV) radiation response of the CaSO4:Dy pellets produced at IPEN/SP was studied using phototransferred thermoluminescence (PTTL). The PTTL characteristics of three different types of CaSO4:Dy pellets were investigated. The main parameters studied were: thermal treatments, post UV exposure storage time,…
Metal-free- and metallophthalocyanines ( M = Ni , Zn and Co ) carrying four di-n-hexylamino and four chloro groups in peripheral positions have been synthesized from the corresponding dichlorophthalonitrile derivative in the presence of the anhydrous metal salts [ NiCl 2 , Zn ( O 2 CMe ) 2 , CoCl 2 ] or a strong organ…
The temperature and angular dependences of 2 H NMR spectra were measured for single crystal of [Mg(H 2 O) 6 ][SiF 6 ]. At 283 K, (e 2 Qq/h,η) of 2 H, averaged by fast 180° flip of water molecules, were obtained as (128 kHz, 0.72), (123 kHz, 0.82) and (106 kHz, 0.80), corresponding to three unequal water molecules in […
The preservation of physical properties and aesthetics are two important aspects of the film industry. As such, forethought and care need to be taken in terms of the type of polymer and stabilization systems that are used to derive robust and attractive film products. For most applications, a combination of a phenolic…
Eu2O3 in divided groups in pores in a mesoporous Al2O3 (amorphous) has a confined growth in nanocrystals (average, 30 nm diameter) in a new polymorph of R3c hexagonal crystal structure with lattice parameters a = 0.5468 nm and c = 1.6950 nm. This occurs on reacting dispersed Eu3+ cations (in water) with a mesoporous A…
Abstract Graft copolymerization of an oligomeric vinyl phosphonate (FYR) and/or N ‐methylolacrylamide was made onto cotton fabrics by a pad‐dry‐steam method. The limiting oxygen indices (LOI) of the treated samples confirmed the P–N synergism. Simultaneous TG/DTA measurements indicated that an exothermic peak appeared…
Liz Turner, M.P.A; Monterrey Workshop Summary: Evaluating the Usefulness of Elemental Iron Powders, Nutrition Reviews, Volume 60, Issue suppl_7, 1 July 2002, Pa