Materials Literature
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For designing three-dimensional cobalt(II) metal complexes and Schiff base ligands, the geometry was taken from the starting structures based on the crystallographic data. The density functional theory (DFT) B3LYP/6-31g(d)-FF method was used to calculate the second-order nonlinear optical (NLO) properties of open-shel…
Abstract Two isomers of N-(2-pyridylmethyl)glycinatocobalt(III) complexes containing incomplete cubane Co3O4 cores, [Co3(pg)3(μ3-O)(μ-OH)3]+, were isolated and their structures were determined by the X-ray diffraction method. While the trinuclear structure of one of the two isomers was stabilized by three inter-ligand…
Abstract De-esterification and sulfonation reactions, which create new anionic groups in the middle lamella and primary wall layers, are the key chemical reactions in chemithermomechanical pulping. The effects of these reactions on the resulting fibre dimensions, refining energy demand, hand-sheet bulk and strength pr…
The temporal characteristics of a nematic liquid crystal-polyaniline-fullerene (NLC-PANI-C 60 ) system have been studied with a view to the new field of application of PANI-containing structures: display and optoelectronic technologies. It is shown that the complexation between PANI and fullerene stimulates a transiti…
Pure alumina composite powders for low-temperature sintering purpose are examined. θ- and α- phase alumina particles with crystallite sizes 20 to 50 nm and 50 to 200 nm, respectively were mixed in an appropriate ratio. The composite powder can be easily sintered at temperatures as low as 1400oC, preparing high density…
Investigations of the influence of synthesis procedures and LaSr-manganite stoichiometries on the Curie point and other magnetic characteristics of the material, being the topic of this work, are attractive since they present a necessary primal step in the intended development of nano-magnetic drug carriers based on t…
The role of defects formed owing to the deviations from stoichiometry is analyzed for CaWO 4 single crystals grown by the Czochralski method. It is shown that the defects leading to the light scattering in CaWO 4 crystals affect the spectra of X-ray luminescence and the luminescence kinetics only slightly, but give ri…
Here, as part of our experimental investigations dealing with poly(urethane-isocyanurate) networks, we investigate model irregular networks with increasing amount of dangling chains. In our study such an irregular network topology was obtained by partial substitution of a diol for a monohydroxy component during the pr…
In this paper, we use a circular distribution to quantify certain domain properties and model the hysteresis behavior of piezoceramic materials. The model is constructed by bridging the characteristics of microscopic domain distribution into the macroscopic (or bulk) behavior. Contributions, other than those associate…
The effects of the antiferrodistortive surface reconstruction and the interface with a SrTiO 3 substrate on the ferroelectric properties of PbTiO 3 ultrathin films are investigated using an interatomic potential approach with parameters determined from first-principles results. First we show that a shell model develop…
Ferroelectric materials have been extensively studied through their optical and dielectric properties. However, there are no many reports concerning simultaneously elastic and dielectric characterization. In this work, ferroelectric ceramics of SPT (x = 0.25) have been investigated by the ultrasonic pulse echo techniq…
A wide variety of morphologies, such as screw‐like filaments, ribbons, etc., have been observed in polarizing microscopy studies of the B7 phase in a melt or with free surface. In this paper, we present the results of AFM and scanning electron microscopy measurements of structures formed by a columnar‐type B7 phase. T…
A low-fire, densified ferroelectric+ferrimagnetic ceramic composite consisting of Pb(Ni 1/3 Nb 2/3 )O 3 –PbZrO 3 –PbTiO 3 (PNZT) and Ni–Cu–Zn ferrite powders is prepared at temperatures below 900 °C. The low-fire densification behavior is attributed to the migration of PbO from PNZT into Ni–Cu–Zn ferrite, enhancing th…
Piergorite-(Ce) is a new mineral found at Tre Croci, Vetralla, Italy with simplified formula Ca 8 Ce 2 (Al 0.5 Fe 3+ 0.5 ) Σ1 (□,Li,Be) 2 Si 6 B 8 O 36 (OH,F) 2 . It occurs as strong intergrowths of small crystals, colorless to pale yellow, associated with sanidine, mica, magnetite, rutile, titanite, and other Th-U-RE…
In this study the intercalation behavior of di- and trivalent cations like Cu(II), Mg(II), Zn(II), and Al(III) into the interlayers of muscovite was investigated by X-ray diffraction and far-infrared spectroscopy. The X-ray diffractometry shows that the original material is a muscovite 2M(1). During the metal cation t…
Attempt has been made to determine the effect of the concentration of the solutions of anionic polysaccharides and cationic oligochitosans (modified or not) on some properties of the systems obtained. They were either binary microspheres: sodium alginate/Ca+2 cation or ternary ones: sodium alginate/Ca+2 cation/oligoch…
This paper presents a wavelet packet transform (WPT) based on-line technique for the protection of three-phase interior permanent magnet (IPM) motor. A wavelet packet transform based algorithm for the protection of an IPM motor is developed, implemented, and tested on-line using the DS1102 digital signal processor boa…
Abstract Microstructure, reacting degree and main properties of synergistically modified unsaturated polyester resin (UPR) with polyester urethane (PU) and organically‐modified montmorillonite (OMT) are studied in this paper by scanning electron microscopy (SEM), X‐ray diffraction (XRD), FT‐IR, contact angle and mecha…
Mechanistic models of pilling are discussed in general terms, and a framework for pilling simulations is thereby created. A fundamental flaw in earlier models of pilling is revealed. A more comprehensive model of fibre diffusion and withdrawal from the fabric is proposed, and this is solved in general terms to find th…
This work presents a thermodynamic model to theoretically predict the component activity in multicomponent liquid alloy based on the Wilson equation and an extended Miedema model. Using only the physical parameters of pure metals, the component activities can be theoretically calculated and the calculation results agr…