Materials Literature
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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…
Amorphous polymers are viscoelastic materials. When they are subjected to dynamical loads, their behavior can be modeled by transform functions of stress and strain in the complex plane. In our work, a model based on the fractional calculus concept is proposed in order to predict the viscoelastic behavior of polymethy…
A dynamic Monte Carlo (MC) simulation is performed to investigate the phase behavior of mixtures of flexible polymers and low molecular weight thermotropic liquid crystals (LCs). The polymer is represented by three-dimensional self-avoiding lattice chains, while the LC is described by the Lebwohl-Lasher nematogen mode…
Chromium dioxide, CrO2, attracts significant interest as it has a unique electronic band structure, resulting in half-metallic ferromagnetism (TC ≈︂ 390 K) with completely spin-polarized electrons at EF. In this work we report the polarized Raman spectra of CrO2 between 5 and 420 K, as obtained from (110) and (001) or…
The properties of the mechanical behavior of porous ceramic based on partially stabilized zirconium dioxide are studied. The special features of the mechanical behavior of ceramic with different degrees of porosity are determined. It is shown that three macrodeformation mechanisms are observed simultaneously in the ma…
The development is described of a new environmental TLD dosemeter badge and dose computation algorithm based on the new LiF:Mg,Cu,P material. LiF:Mg,Cu,P, with its high sensitivity, tissue equivalence, energy independence, and low fading characteristics, is a natural choice for environmental dosimetry. The badge consi…
The crystal structures of a series of dithiadiazolyl free radicals, p-XC6F4CNSSN (X˭F,Cl,Br and CN) are described in terms of dipolar interactions which induce chain-like motifs in the solid state. When X˭CN two morphologies are observed; the β-phase is polar and undergoes a phase transition to a weakly ferromagnetic…
Poly(propylene)/aromatic polyamide blends were prepared by melt mixing, without or with the addition of an interfacial modifier, viz. a poly(propylene) polymer grafted with 1 wt.-% of maleic anhydride. The characteristics of these polymer blends were investigated by differential scanning calorimetry, dynamic mechanica…
The Lifshitz–van der Waals theory has been used to calculate the contact angles of dispersive liquids and solids: diiodomethane, α-bromonaphtalene, methylnaphtalene, benzene, and n-octane, liquids on polytetrafluoroethylene, polystyrene, polyisobutene, polyvinylchloride, and polyethylene. The theoretical calculation o…
Different methods for characterizing the morphology of multiphase blends were applied to a blend of thermoplastic polyurethane with 20 wt% polypropylene as the dispersed phase. Optical microscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), and light scatt…
In applications like space satellites, high-energy physics experiments, and nuclear power stations, epoxy structural adhesives are normally used in an ionizing radiation environment. To check the effects of γ-irradiation on room temperature epoxy adhesives, mechanical measurements were undertaken for three different r…
The stress-strain behaviour of polyethylene, determined from mechanical tests at constant true strain rate, is characterized by high strain hardening in uniaxial tension and strain softening in simple shear. The strong influence of the deformation path is correlated with the different crystalline textures developed. T…
The microstructure of Al-Zn alloys, with the Zn atom fraction, x(Zn) less than or equal to 62%, has been studied in detail by XRD in dependence on the composition, temperature and previous thermal treatment. Precipitation phenomena in alloys, transferred to the supersaturated state by rapid quenching from the solid so…