Materials Literature
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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…
Abstract Novel polyurethane gels have been reported in common solvent like dimethyl formamide (DMF). Polyurethanes have been synthesized from diisocyanates, diols and rigid chain extenders. We have illustrated the influence of chemical structure of the chain extenders on gelation rate, thermal property and morphology…
A topology-symmetry analysis is performed for a number of phosphate, silicate, and germanate (gallate) structures. The fundamental structural unit of these structures is an { M ( T O 4 ) 6 } block consisting of the central octahedron sharing vertices with six tetrahedra. It is shown that, in the germanate, silicate, a…
Manganese-doped cadmium sulfide nanoparticles are synthesized in a flexible polymer matrix (synthetic rubber) by a chemical route. They are bombarded with 80-MeV oxygen ions having electronic energy loss (Se) dominant over nuclear energy loss (Sn) and with fluence variation 1011–1013 ions/cm2. Piling up of nanoparticl…
Zirconolite is a potential matrix for the immobilization of the minor actinides: neptunium, curium, americium, and small quantities of unrecyclable plutonium, produced by the reprocessing of the spent fuel.In order to check the incorporation of actinides into the structure, zirconolite ceramic pellets doped with 10 wt…
Fatigue-free Na 0.5 K 0.5 NbO 3 (NKN) thin films were grown on Pt/Ti/SiO 2 /Si substrates by the radio frequency magnetron sputtering method. The addition of enriched Na 2 CO 3 and K 2 CO 3 into the NKN ceramic target was necessary in order to compensate for a deficiency in the Na and K concentrations in the film. The…
The ternary compounds (RE 3 N)Sn with RE = La, Ce, Pr, Nd, Sm were prepared starting from the elements. The compounds with RE = La, Ce, Pr were obtained as single phase materials according to X-ray powder diffraction patterns, which also indicate the cubic inverse perovskite crystal structure (space group Pm3̄m, La: a…
Gold nanoparticles immobilized on carbon and oxide supports showed catalytic activity in the hydrogenation and allylic isomerization of alkenes and arylalk-1-enes. The catalysts were active only in the case when the average size of metal particles did not exceed 30 nm. Hydrogenation was accompanied by the allylic isom…
Batch culture of Ralstonia eutropha using the recycled gas closed circuit culture system was conducted in order to develop a practical fermentation system for industrial autotrophic culture for poly (hydroxybutrate) production. The gas phase of the culture system consisted of substrate gas so that gases in this cultur…
A new semicrystalline polyimide, based on 1.3-bis-(3,3′,4,4′-dicarboxyphenoxy)benzene (R) and 4,4′-bis-(4-aminophenoxy)biphenyl (BAPB), was modified by exfoliated graphite nanoplatelets of different shape, sizes and structure. This R-BAPB type polyimide, with a molecular weight M w = 30000 g/mol has a low melting temp…
The phase equilibria in the concentration triangle Bi 2 O 3 -BaB 2 O 4 -B 2 O 3 of the BaO-Bi 2 O 3 -B 2 O 3 system have been investigated by X-ray powder diffraction and DTA. Barium bismuth borates of the composition BaBi 2 B 4 O 10 and BaBiB 11 O 19 have been found to exist. These borates melt at 730 and 807°C, resp…
BaTi1-xSnxO3 (BTS) powders, with x ranging from 0 to 1, were synthesized by solid-state reaction technique. The powders were pressed into pellets and sintered at 1370 and 1420 oC. The structural characterization of sintered BTS samples was made at room temperature using X-ray diffraction and Raman spectroscopy measure…
Abstract Macroporous titania monoliths were prepared via sol‐gel method using polymer foam as templates. The polymer foam polymerized via concentrated emulsion polymerization was immerged in a solution of titanium(IV) isopropoxide in 2‐propanol, which underwent a sol‐gel process. The organic components were subsequent…
Purpose This paper aims to study the growth and properties of potentiostatic passive films formed on iron electrodes immersed in pH 8.9‐11.0 phosphate solutions. Design/methodology/approach First, passive films were grown potentiostatically on pure iron electrodes under different experimental conditions (namely the Na…
Microscopic retention properties have been studied in detail. Domain growth and stability of ferroelectric Pb(Zr,Ti)O 3 thin films were investigated with electrostatic force microscope to understand microscopic polarization retention loss mechanism in polycrystalline and epitaxial Pb(Zr,Ti)O 3 thin films. Growth of do…
The electret polarization is investigated in the TlGaSe 2 ferroelectric semiconductor. It is proved for the first time that stable internal electric fields associated with residual electret polarization are induced in crystals of the TlGaSe 2 ferroelectric semiconductor at temperatures T < 200 K. It is experimentally…
We present a proof-of-principle study of a vertically aligned carbon nanofiber switch and study relevant parameters via a model for a static switch. Vertically aligned freestanding carbon nanofibers are produced by plasma-enhanced chemical vapor deposition (PECVD) and their deflection under applied voltage is measured…
Abstract Photochromic diarylethenes having benzofuran and benzothiophene rings have been synthesized and their photochromic performance in a single-crystalline phase has been examined. Although 1,2-bis(2-methyl-1-benzothiophen-3-yl)perfluorocyclopentene (1a) is photochemically inactive in the single-crystalline phase,…