Materials Literature
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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…
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…