Materials Literature
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We have developped a novel lift-off process for fabrication of high quality superconducting submicron niobium structures. The process makes use of a thermostable polymer with a high transition temperature T_{g}= 235 C and an excellent chemical stability. The superconducting critical temperature of 100 nm wide niobium…
In the asymptotic limit, the interlayer exchange coupling decays as $D^{-2}$, where $D$ is the spacer thickness. A systematic procedure for calculating the preasymptotic corrections, i.e., the terms of order $D^{-n}$ with $n \ge 3$, is presented. The temperature dependence of the preasymptotic corrections is calculate…
The adsorption behavior of bovine serum albumin (BSA) on high-purity austenitic low-carbon stainless steel and its effect on the state of the electrode surface have been studied over the temperature range 299−343 K under open-circuit-potential conditions, using electrochemical impedance spectroscopy (EIS). The impedan…
A drastic change in the solubility and gelation properties of 1-O-methyl-4,6-O-benzylidene derivatives of monosaccharides (see figure) results from the change in the configuration of only one carbon atom.
Reversible switching of quadratic NLO responses can be achieved in organic and metallo-organic molecular compounds by application of various external stimuli. Strategies for the molecular engineering of switchable NLO materials are outlined (an example is depicted), and practical demonstrations of the switching of NLO…
After forever changing the drug discovery process in the pharmaceutical industry, combinatorial chemistry methodologies are increasingly being applied to the discovery and optimization of more efficient catalysts and materials (see picture). With the advent of new combinatorial synthesis and screening technologies, co…
Scanning tunneling spectroscopy was used to investigate single crystals and thin films of La(1-x)Ca(x)MnO(3) (with x of about 0.3), which exhibit colossal magnetoresistance. The different spectroscopic signatures of the insulating (paramagnetic) and metallic (ferromagnetic) phases enable their spatial extent to be ima…
Calcium tracer diffusion coefficients in (La,Ca)CrO3 were determined by a nitric acid solution application method using 44Ca(NO3)2. The diffusion profiles of 44Ca in the air-sintered (La,Ca)CrO3 were measured by secondary ion mass spectrometry (SIMS) with a bombardment of primary O2+ ion. From the SIMS depth concentra…
The phase transformation between diamond and graphite in preparation of diamond by pulsed-laser-induced liquid - solid interface reaction (PLIIR) was studied by calculating the probability of phase transition of the carbon atoms over a potential barrier in the pressure-temperature ( P - T ) phase diagram of carbon. It…
Simple statistical agglomeration models can provide a universal link between the local structure and the glass transition temperature in network glasses. We first stress the physical features of the models and the hypothesis made, and then show how to define the glass transition temperature. The models are applied to…
We report a study of polycrystalline samples of the family La1-xCdxMnO3+dwith different percentage of Mn4+ ions. X-rays diffraction, Iodometric titration, Raman, Magnetic and Electrical Resistivity measurements provide a general characterisation of the physical properties. Results are qualitatively similar to the ones…
The structure and magnetic properties of Ho 2 (Co 1- x Fe x ) 17 compounds with x = 0.0, 0.1, 0.2, 0.3, 0.4, 0.6, 0.8 or 1.0 have been investigated by x-ray diffraction (XRD) and magnetization measurements. XRD patterns demonstrate that all samples are single phase with the hexagonal Th 2 Ni 17 -type structure. The su…
The symmetry and disorder of the Eu 3+ site was investigated in some phosphate and borate glasses by means of 151 Eu Mössbauer spectroscopy. The quadrupole interaction parameter, which is due to the distortion of the Eu site compared to a cubic symmetry, has been measured together with the asymmetry parameter, which p…
The diffusion of acetophenone in peroxide cross-linked low-density polyethylene (LDPE) medium-voltage cable was investigated with Fourier transform infrared (FTIR) microscopy. The influence of storage under normal climate and for up to 2 years on the acetophenone profile are discussed. The diffusion rate and the coeff…
The new macrocyclic dicyanoargentate complex Cs(dibenzo-24-crown-8)[Ag(CN) 2 ] has been prepared and studied by means of X-ray diffraction (monoclinic, space group P2 1 /a, with a = 12.730(3), b = 15.443(3), c = 15.323(3) Å, V = 3005(1) Å 3 , Z = 4, R1 = 0.041; wR2 = 0.048 for 5488 unique reflections with I > 3σ(I)…
High-field cantilever-force magnetization measurements of the spin-Peierls compound $(\mathrm{TMTTF}{)}_{2}{\mathrm{PF}}_{6}$ indicate that the uniform phase spin susceptibility is ${\ensuremath{\chi}}_{s}\ensuremath{\approx}(4.5\ifmmode\pm\else\textpm\fi{}1)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4} \ma…
Two different phases of spin-crossover cis-bis(thiocyanato)-bis(N-2′-pyridylmethylene)-4-(aminobiphenyl) iron(II), Fe(PM-BiA)2(NCS)2 have been investigated by EPR in X- and Q-bands. The EPR parameters for Mn2± show that the phase II has similar behavior to intentionally doped compound. EPR spectra as function of the t…
Abstract A two‐layer model was developed to accurately represent low thermal IR emittance paint coatings. The coatings were formed by mixing aluminum flakes with polymeric binders. Because of the different densities of these two components, a two‐layer structure was constructed with a pure polymeric layer on top and a…
Blaßgelbe Einkristalle des bislang chloridreichsten Selten-Erd(III)-Sulfidchlorids mit der Zusammensetzung Sm2SCl4 erhält man durch Oxidation von Samarium-Metall mit Schwefel im molaren Verhältnis von 2 : 3 in einer Schmelze aus überschüssigem SmCl3 bei 850 °C (7 d) in evakuierten Quarzglasampullen. In der Kristallstr…
The temperature dependences of 7 Li and 15 N NMR spin-lattice relaxation times and spectra in LiNO 2 were measured in the range 120 K -473 K (m.p.). The 180°-flip motion of NO 2-- ions along or perpendicular to the molecular C 2 -axis and the self-diffusion of Li + ions (activation energies of 42 -44 and 100 kJ mol -1…