Materials Literature
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Abstract Cobalt thin films are deposited by metal‐organic (MO)CVD, under various experimental conditions, on Si and SiO 2 substrates. The precursors used are cobalt nitrosyl tricarbonyl, Co(CO) 3 NO, cobalt acetylacetonate, Co(acac) 2 , and cobalt carbonyl, Co 2 (CO) 8 . Emphasis is given to the delivery method of eac…
The possibility of realizing spin superradiance by an assembly of magnetic nanoclusters is analyzed. The known obstacles for realizing such a coherent radiation by magnetic nanoclusters are their large magnetic anisotropy, strong dephasing dipole interactions, and an essential nonuniformity of their sizes. In order to…
Results of a x-ray photon correlation spectroscopy experiment on the very weakly first order martensitic transformation of a Au50.5Cd49.5 single crystal are presented. Slow non-equilibrium-dynamics are observed in a narrow temperature interval in the direct vicinity of the otherwise athermal phase transformation. Thes…
We proposed a new recordable multilayer optical disc and its recording system. The new optical disc has multiple-plane-recordable layers and a separated guide layer, and we fabricated 16 recording layers made of high-transmittance inorganic recording materials stacked on the separated guide layer. The recorded signals…
This study is the first to investigate novel cone lasers and the tunabilities of their lasing feature and performance based on dye-doped cholesteric liquid crystal (DDCLC) films with various LC birefringences (Δn). A unique conically-symmetric lasing ring with a low energy threshold occurs at a specific nonzero obliqu…
Dielectric properties of (1-x)Ba(Fe0.5Nb0.5)O3-xBaTiO3 (where x = 0.00, 0.05 and 0.10) solid solution ceramics at high temperature range of RT ~ 270 o C have been characterized in this paper. The above said polycrystalline ceramics with (x = 0.0, 0.05 and 0.10) have been produced via a mixed oxide route. The effects o…
A new approach to the preparation of nanocomposites is advanced. This approach includes preliminary formation of a nanoporous matrix and subsequent loading of the formed pores by the second component. These advantageous opportunities are provided by one of the most fundamental phenomena of the physical chemistry of po…
The domain structures of the lead-based relaxor ferroelectric solid solution single crystal, 24Pb(In 1/2 Nb 1/2 )O 3 (PIN)–46Pb(Mg 1/3 Nb 2/3 )O 3 (PMN)–30PbTiO 3 (PT), near a morphotropic phase boundary (MPB) composition grown by the Bridgeman method were studied by polarized light microscopy (PLM), piezoresponse for…
The effect of oxygen content on the magnetic properties of the layered perovskites has been investigated. The samples, PrBaCo2O5+δ (0.35 ≤ δ ≤ 0.80), were prepared by sol-gel method and characterized by X-ray diffraction and dc magnetization. A detailed magnetic phase diagram for PrBaCo2O5+δ is presented. It is found…
Abstract During annealing of particle-containing aluminum alloys, very often the development of the so-called P {011}<111>-texture and ND-rotated Cube {001}<310>-texture components are observed. The present paper focuses on the origin of the P-component near particles in an Al-1.1 wt.% Mn alloy and its fur…
An epitaxial ZnO thin film was entirely fabricated by pulsed laser deposition. Both the orientation and the size of the crystallites were studied. The X-ray diffraction (XRD) patterns of the film show strong c -axis oriented crystal structure with preferred (002) orientation. The Phi-scan XRD pattern confirms that the…
The ternary compound Cu 3 TaS 4 has been investigated by means of X-ray powder diffraction and its structure has been refined by the Rietveld method. This compound is isostructural with the sulvanite mineral Cu 3 VS 4 , and crystallizes in the cubic P 43m space group (No. 215), Z = 1, with unit cell parameters a = 5.5…
This paper presents a design study of a 3-phase AC main exciter (ME) for an aircraft starter-generator. A computationally efficient methodology for optimizing the design of the ME is presented. The optimisation is carried out using coupled two-dimensional (2D) magnetostatic finite element solver and particle swarm opt…
Thin films of thermochromic vanadium dioxide have been the subject of intensive research in recent years year due to their postulated use as "intelligent" window coatings. The usefulness of such technology depends on a semi-conducting to metal transition with an associated change in infra-red optical properties. This…
The agricultural wastes from harvesting corn, viz. corn husks and corn cobs were used as raw materials for the preparation of microcrystalline cellulose. From chemical composition analysis, holocellulose, -cellulose, hemicellulose, extractive and ash contents found in the corn husk were higher than those in the corn…
Phase relations, dielectric and piezoelectric properties are reported for the ternary system 98%[(1 - x) (Na(0.5)K(0.5)NbO(3))-x(LiTaO(3))]-2%[BiScO(3)] for compositions x ≤ 10 mol% LiTaO(3). The phase content at room-temperature changed from mixed phase, monoclinic + tetragonal, for unmodified 98%(Na(0.5)K(0.5)NbO(3)…
A ceramic slurry that contains a 6H-type Ba(Ti 0.95 Mn 0.05 )O 3 powder was casted into a plaster mold under 10 T magnetic field to form a green compact of (0001)-oriented Ba(Ti 0.95 Mn 0.05 )O 3 . After sintering the green compact at 1300 °C in air, it was confirmed that the (0001)-oriented 6H-type perovskite structu…
Single crystalline, sub-15 nm BaZr(x)Ti(1-x)O(3) (0 ≤x≤ 1) nanocrystals were synthesized at room temperature via the vapor diffusion sol-gel method. As-prepared nanocrystals exhibit noncentrosymmetric regions whose volume fraction increases significantly upon substitution of small amounts of Zr(4+) for Ti(4+) and reac…
The effect of interstitial hydrogen atoms on the mechanical properties and plastic strain localization patterns in tensile tested Fe-18Cr-12Ni-2Mo single crystals of austenite steel with low stacking-fault energy has been studied using a double-exposure speckle photography technique. The main parameters of plastic-flo…
We have confirmed a high dielectric constant after poling ε 33 T /ε 0 of 7700 and piezoelectric constant d 33 = 2250 pC/N, which are 40% larger than those of the initial sample, for a lead magnesium niobate–lead titanate 0.72 Pb(Mg 1/3 Nb 2/3 )O 3 –0.28 PbTiO 3 single crystal plate with a manganese oxide/gold (Au) com…