Materials Literature
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Neutron studies of the effect of A-site chemical disorder on the ferromagnetic transition and spin dynamics for the magnetoresistive perovskite La0.54Ba0.46MnO3 are reported. The low temperature spin waves reveal that disorder reduces exchange interactions by only 9%. The development of a quasielastic peak in the spec…
Highly ordered two-dimensional arrays of monodisperse coinage metal nanowires embedded in an alumina matrix have been prepared. When light is propagating in the direction of the long axis of the nanowire, plasmon-enhanced absorption and light guidance of the nanowire were observed by optical microspectroscopy and scan…
Abstract The results of X‐ray structural analysis, in situ powder high temperature X‐ray diffraction (HTXRD), DTA and annealing studies are summarized to refine the phase equilibria in the Rb 2 O‐B 2 O 3 system in air. Samples were prepared by solid state reaction as well as by the crystallisation of glasses. Investig…
Faujasite type zeolite CBV-780 was tested as adsorbent for isotactic polypropylene by liquid chromatography. When cyclohexane, cyclohexanol, n-decanol, n-dodecanol, diphenylmethane, or methylcyclohexane was used as mobile phase, polypropylene was fully or partially retained within the column packing. This is the first…
The initial growth mode of indium tin oxide (ITO) on polycarbonate (PC) substrates was investigated. Some of the PC substrates were bombarded by 1-keV Ar ions in an oxygen environment to modify the substrate surface before ITO sputter deposition. The initial part of the film growth was transformed from a three-dimensi…
A spectral switcher based on the Yb3+-doped Nd3BWO9 crystal has been demonstrated. This system switches its main luminescence peak from 980nm (the characteristic luminescence of Yb3+ ions) to 1060nm (the characteristic luminescence of Nd3+ ions) as the 808nm pump intensity is increased from 0.4 up to 0.8kW∕cm2. The op…
Hysteresis loops of the piezoelectric coefficient, d33=f(E3), are measured on virgin and fatigued lead zirconate titanate ceramics. Four parameters are directly extracted from the measurements: internal bias field Eb, offset piezoelectric coefficient doffset, coercive field Ec, and remnant piezoelectric coefficient dr…
We report here on an in situ experimental analysis of the growth processes of tin dioxide nanoparticles (with mean particle radius of less than 5nm) and the oriented attachment of these particles onto SnO2 nanobelts, used as single crystalline substrates, through electron irradiation by transmission electron microscop…
Refractive indices for cubic-phase MgxZn1−xO (0.55⩽x⩽1) thin-film alloys were determined from transmission measurements and Manifacier envelope method. The refractive index of cubic MgxZn1−xO decreases with the Mg fraction increase, such as at the wavelength of 400nm the refractive index decreases from 1.89 to 1.73 as…
Abstract Summary: Simultaneous small‐ and wide‐angle X‐ray diffraction of in vitro calcified highly ordered decalcified shad fish bone collagen have identified the calcium phosphate (Ca‐P) crystals, formed as poorly crystalline apatite, and their highly ordered spatial, axial distribution with respect to the supramole…
Thin films of the luminescent polymer poly[2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV) were deposited in high vacuum directly from toluene solution on Ag substrates using a homemade electrospray (ES) deposition system. The films were deposited in multiple steps without breaking the vacuum and cha…
This paper studies the pressure effect on radial breathing modes (RBMs) of multiwall carbon nanotubes (MWNTs). The analysis is based on a multiple-elastic shell model which assumes that each of the concentric tubes of a MWNT is an individual elastic shell and coupled with adjacent tubes through van der Waals interacti…
Self-organized zinc oxide (ZnO) nanofiber network with six-fold symmetry was fabricated on ZnO-buffered (0001) sapphire substrate with patterned gold catalyst by vapor-phase transport method. From the ZnO buffer layer, hexagonal ZnO nanorods with identical in-plane structure grew epitaxially along [0001] orientation t…
The polarity of molecular-beam epitaxy grown ZnO films was controlled on nitrided c-sapphire substrate by modifying the interface between the ZnO buffer layer and the nitrided sapphire. The ZnO film grown on nitrided sapphire was proven to be Zn-polar while the O-polar one was obtained by using gallium predeposition o…
Superlattice-structured ferroelectric single crystals composed of Bi4Ti3O12 (BiT) and BaBi4Ti4O15 (BBTi) have been reported to show a large spontaneous polarization as well as a sufficient insulating property. X-ray diffraction and transmission electron microscopy observations of the crystals revealed a superlattice s…
Abstract The phenomenon of dislocation patterning during melt growth of III‐V, II‐VI and IV‐VI semiconductor crystals is discussed. The paper is focused on the formation of cellular structures driven by the growth inherent thermo‐mechanical stress. Of particular interest is the scaling of relations between cells size,…
Impedance analysis studies were carried out on compensated bulk lead zirconate titanate samples. Fatigue is concomitant with the onset of dielectric loss. This is shown to be dominantly due to an irreversibly modified near-surface layer that can be polished off. The highly compensated nature of these samples minimizes…
Abstract Summary: We present a new method for preparing a nanocomposite containing highly dispersed ZnO nanoparticles. The essence of this approach is the formation of surface modified inorganic particles and their homogeneous incorporation into a polymeric matrix. Therefore, an inverse emulsion of an inorganic salt,…
The influence of fractal clusters of a normal phase on the current-voltage characteristics of a percolation superconductor in the region of a resistive transition has been studied. The clusters represent the aggregates of columnar defects, which give rise to a correlated microscopic disorder in the system. Dependencie…
Depinning of vortices in percolative superconductor containing fractal clusters of a normal phase is considered. Transition of the superconductor into a resistive state corresponds to the percolation transition from a pinned vortex state to a resistive state when the vortices are free to move. The motion of the magnet…