Materials Literature
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We report on measurements of the temperature dependence of the electrical resistivity (ρ), thermopower (S), and thermal conductivity (κ) of Ti-Zr-Ni alloys between 10 and 300 K. A series of Ti-Zr-Ni quasicrystals (QCs) Ti40Zr40Ni20, Ti45Zr35Ni20, and Ti50Zr30Ni20 and metallic glasses Ti35Zr45Ni20 and Ti40Zr40Ni20 was…
Size and temperature dependences of second-order optical effects in Cu-doped cadmium iodide nanocrystals are studied. A large enhancement of photoinduced second harmonic generation (PSHG) with decreasing thickness of the nanocrystals or temperature is observed. The PSHG is also found to be enhanced with increasing Cu…
Abstract In this work, moisture curable flame retardant HTPB‐based polyurethane adhesives were synthesized. The influence of HBCD (Hexabromocyclododecane) as flame retardant on adhesion, degradation and change in flammability of synthesized HTPB‐based polyurethane has been studied. Relationship between phase separatio…
In this study, we investigate the effect of the inclusion of nitrogen in amorphous carbon thin films deposited by pulsed laser deposition, which results in stress induced modifications to the band structure and the concomitant changes to the electronic transport properties. The microstructural changes due to nitrogen…
Photoluminescence (PL) is observed from ZnO nanoclusters formed in ZnO plasma due to cooling of plasma species by passing a collimated beam of fourth harmonic (266 nm) of Nd:YAG (yttrium aluminum garnet) laser through ZnO plasma formed by third harmonic (355 nm) of Nd:YAG laser. A shift of 42 meV in peak position of P…
Abstract We report the comparative electrical properties of monovalent (Na + ), divalent (Ca 2+ , Sr 2+ ), trivalent (In 3+ , La 3+ ) and coupled substitution of divalent and trivalent (Ca 2+ + Sm 3+ ) cation‐doped CeO 2 . The investigated samples were prepared by solid‐state reaction (ceramic) using the corresponding…
Epitaxial La0.7Sr0.3MnO3/PbZrxTi1−xO3 multilayers were fabricated by pulsed-laser deposition and studied by structural, magnetic, and electric characterization techniques. Transmission electron microscopy and x-ray diffractometry proved the excellent structural quality of the samples. A high ferroelectric polarization…
Hessian cloth (jute fabrics) samples were soaked in the alcoholic shellac solution and dried at 333 K for 4 hours. Six layers of shellac treated hessian cloth were heat pressed (373 K for 10 min at 5 MT pressure) to fabricate biocomposite and then its mechanical properties were evaluated. To improve the mechanical pro…
A counter-intuitive phenomenon of propagation below cut-off in a waveguide filled with an anisotropic mu-negative metamaterial is investigated analytically, numerically, and experimentally. It is shown that the equivalent plane waves that make up the waveguide mode are inhomogeneous, and this fact is responsible for s…
Activated sludge from a full-scale pulp-paper industry wastewater treatment plant was used as a source of microorganisms to produce biodegradable plastics (polyhydroxyalkanoates) (PHA) at 25°C, pH 7 and at different initial sludge suspended solids (SS) concentration (5, 10, 15, and 20g∕L) in computer controlled fermen…
The magnetic behavior of nickel ferrite nanoparticles of different sizes was studied by annealing nickel ferrite powders at temperatures ranging from 300 to 900 °C. Transmission electron microscopy studies show that the average particle sizes change from ∼8 to ∼120 nm with increasing annealing temperatures. The x-ray…
The problem of the physical mechanisms of collective magnetic behavior, both static and dynamic, of an assembly of ferromagnetic particles comprising a nanocomposite material has been addressed. Detailed measurements of magnetization curves and microwave absorption spectra of films prepared from chemically synthesized…
Thin films of Pr1−xCaxMnO3 (x=0.5,0.6) deposited on LaAlO3 and SrTiO3 substrates have been studied by Raman spectroscopy at low temperatures in order to investigate the effect of strains from the Ca doping or the substrate. A detailed assignment of the observed bands is suggested based on the present observations and…
The quasi-LO phonon mode is related to the specific defects that strongly affect the photonic properties of materials such as zinc oxide (ZnO). The line shapes of the quasi-LO phonon of ZnO annealed in different environments have been investigated. The experimental results show that this mode has the greatest Raman sh…
Based on theoretical calculations, we find that the crystal structure of InGaO3(ZnO)m consists of an alternating stack of a wurtzite (Ga∕Zn)–O block and an In–O octahedral layer. In the (Ga∕Zn)–O block, the Ga atoms favor a modulated boundary structure against a flat boundary structure. The band spectrum shows that ho…
Highly aligned, 2-3 wall carbon nanotube (CNT) arrays were used to examine the kinetics of CNT growth. A growth interruption method was used to determine the in situ growth rate. The growth interruption method with a water vapor treatment or acetylene treatment during the interruption enabled the production of CNT sta…
Deep level transient spectroscopy, current-voltage, and capacitance-voltage measurements are used to study interface traps in metal-on-bulk-ZnO Schottky barrier diodes (SBDs). c-axis-oriented ZnO samples were cut from two different vapor-phase-grown crystals, and Au- and Pd-SBDs were formed on their (0001) surfaces af…
LaNiO 3 films with various thicknesses were deposited on Si substrates by sputtering. The film thickness dependent strain state, microstructure and electrical properties were investigated. X-ray diffraction analysis shows that the films are generally strained with larger lattice constants than the value for bulk LaNiO…
A comparative study of the gas sensing properties of n- and p-type ZnO films was performed. The carrier type and concentration tailored by varying the sputtering Ar/O2 mixture were examined by Hall effect measurements. The gas sensing properties were studied by monitoring changes in the dc resistance upon exposure to…
A complete two-layer Hall-effect model, allowing arbitrary donor and acceptor profiles, is presented and applied to the problem of conductive surface layers in ZnO. Temperature-dependent mobility and carrier concentration data in the temperature range of 20–320 K are fitted with an efficient algorithm easily implement…