Materials Literature
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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…
The magnetic and crystal structures of the LaCo 0.5 Fe 0.5 O 3 perovskite are investigated. It is established that the unit cell of this compound at room temperature is characterized by rhombohedral distortions. As the temperature decreases, the compound undergoes a structural phase transition from the rhombohedral ph…
Despite the common geographic occurrence of inland (athalassic) saline habitats, their biota has not been extensively studied. Diatoms have been estimated to contribute as much as 25% to the earth's primary production (Werner, 1977). However, in hypersaline systems the proportion of in situ carbon fixation by diatoms…
This study investigated the occurrence of vashegyite from a guano-rich deposit located in the Gaura cu Muscă Cave, Romania. Analytical methods used include optical microscopy, X-ray powder diffraction (XRD), scanning electron-microscopy (SEM), inductively coupled plasma-atomic emission spectrometry (ICP-AES), thermal…
Abstract Self‐consistent band structure and density of states calculations were performed for the pure alumina (corundum phase) and the aluminates α‐Al 2– x T x O 3 where T is a transition metal and stands for Sc, Y, La and Ac with x = 0.5. In this study we have employed the full potential linear augmented plane wave…
Glass samples with nominal compositions SrFe 12 O 19 +(12− n )SrB 2 O 4 +nSrSiO 3 , n =3, 6, 9 were prepared by rapid quenching of the melt. Processes of glass devitrification were studied. The samples were annealed at temperatures of 600–900°C, and the resulting glass–ceramics was characterized by XRD, SEM, EDX, and…
Tin and iron impurity atoms in the structure of crystalline and vitreous alloys Ga1−y Tey (y = 0.6, 0.8) and In1−y Tey (y=0.6) are shown to be stabilized in their normal valence states. It is demonstrated that the electrical inactivity of tin and iron impurity ions is caused by the compensating effect of Ga+ and In+ i…
The ion-oxygen conductivity of apatite-like compounds based on lanthanum silicates and germanates La 10 A 6 O 27 (A = Si, Ge), La 10− x Ca x Si 6 O 27−δ ( x = 0.25, 0.5, 1.0), La 9.75 Ca 0.25 Ge 6 O 27−δ and La 9.33+δ Si 6− x Al x O 26 ( x =0.4, 0.8, 1.5) is studied in the interval of partial oxygen pressures p O 2 ex…