Materials Literature
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Waveform of space charge distribution in solid dielectrics measured by the PEA method is severely distorted due to the wave attenuation in material as well as the intrinsic characteristic of measurement system. The waves of interfacial charges before and after attenuation in sample under low electric stresses were sim…
N-type Bi1.9Sb0.1Te2.6Se0.4 alloys were prepared by a rapid solidification technique and subsequent hot-pressing method. The microstructure and thermoelectric properties of the alloys were investigated as a function of the hot-pressing temperature and pressure. The X-ray diffraction measurements indicate that the grai…
The superplastic properties of different semi-products out of Alloy 718 with microcrystalline (MC), submicrocrystalline (SMC) and nanocrystalline (NC) structures processed by severe plastic deformation and rolling have been studied. The alloy with SMC and NC structures can exhibit features of low temperature superplas…
Two self-complexing compounds based on donor-acceptor interactions, one comprised of a p-electron-deficient cyclobis(paraquat-p-phenylene) (CBPQT 4+ ) ring attached to a side-arm component containing p-electron-rich tetrathiafulvalene (TTF) and 1,5-dioxynaphthalene (DNP) units, and the other comprised of a CBPQT 4+ ri…
Carbon nanotubes are graphene cylinders of nanometric diameter which can be either semiconducting or metallic depending on their geometry. Joining different kinds of nanotubes by means of topological defects, one can design all-carbon quantum dots and, in principle, achieve electronic confinement in quasi-zero dimensi…
Nanorods of a compound semiconductor, BiOCl, have been prepared from BiCl3 solutions containing a nonionic surfactant, t-octyl-(OCH2CH2)xOH, x=9, 10 (Triton X-100). Powder X-ray diffraction (XRD) pattern indicated that the product was pure tetragonal phase bismoclite (BiOCl). The product was also characterized by the…
Hydrogenated amorphous carbon (a-C:H) nanotips have been successfully grown on Cu ∕ Ti ∕ Si ( 100 ) by microwave plasma-enhanced chemical vapor deposition. A Cu etching process occurs simultaneously during the growth of the a-C:H nanotips. Both the Cu etching and a-C:H nanotips growth rates continuously increase with…
Direct observation of the defect formation in carbon nanostructures during electron irradiation is carried out by high‐resolution transmission electron microscopy (HR‐TEM) on the double‐wall carbon nanotubes (DWNT) and carbon nanopeapods. The irradiation damage due to the knock‐on collision with high energy electron b…
At the composition of Ti4040Zr4040Ni2020 , a single_phase cylindr ical quasicrystalline alloy, 3mm in diameter and 15mm in length, can be fabr icated by a copper-mold casting method. Its quasicrystalline nature and structu ral homogeneity were confirmed by x_ray diffraction and transmission electron mi croscopy. Accor…
The structure of high-silica porous glasses and quartz-like (Vycor type) glasses has been investigated by transmission and scanning electron microscopy and by electron micro-probe analysis. Porous glasses (PGs) have been manufactured by acid leaching of phase-separated alkali borosilicate glass plates. To obtain the q…
(ARTYKUŁ ZAMAWIANY) Ceramic matrix composites (CMCs) are non-brittle structural ceramics for application at high temperatures. They consist of ceramic fibers embedded in a ceramic matrix, the fiber/matrix bonding being controlled through weak enough interphase. CMCs are processed following gas, liquid or powder routes…
The connection between the external and internal direct magnetic field intensities in an ellipsoidal magnetic insulator in a uniform field is a classic result in the literature. It is usually stated in terms of shape demagnetising factors. The case of the non-ellipsoidal geometry in a uniform field has been dealt with…
Three polycrystalline bismuth-containing layered perovskite-like oxides are synthesized by high-temperature solid-state reactions. One of these compounds was described previously, namely, Bi 3 Ti 1.5 W 0.5 O 9 , for which the unit cell parameters a = 5.372(5) Å, b = 5.404(4) Å, and c = 24.95(2) Å are determined in thi…
Microalloyed cast steels are a group of microalloyed steels, in which reliable mechanical properties could be achieved by heat treatment. In addition, Thermochemical data indicate that Zr has high affinity for oxygen, nitrogen and carbon.The aim of present work was to investigate on the role of Zr, as a microalloying…
Copper and silver oxide share the rather unusual cuprite structure, formed by two interpenetrating networks of corner-sharing M 4 O tetrahedra ( M = Cu, Ag). Negative thermal expansion of the cell parameter has been observed from 5 to about 200 K for Cu 2 O and up to 470 K for Ag 2 O by powder diffraction. In the case…
MCM‐41 and MCM‐48 were functionalized with cobalt by two methods, incipient wetness impregnation and co‐precipitation, and were characterized by XRD, N2‐sorption, and TPR. The incipient wetness impregnation method provides a high dispersion of small cobalt oxide particles, while the mesoporous structure and high surfa…
Terbium-doped nanocrystalline yttrium aluminium garnet phases, Y3Al5O12:Tb 3+ (YAG:Tb 3+ ), were obtained by using rare-earth nitrates as the starting materials, together with citric acid and ethylene glycol according to the Pechini method. Thermogravimetric and differential thermal analysis were used to study the the…
Relationships between singularly perturbed equations and equations with hysteresis are discussed. 1.1 Introduction 1.1.1 Stop and Play nonlinearities Singular perturbations (including time relaxation) and hysteresis phenomena are among the most common strongly nonlinear elements which arise in almost any industrial, p…
Thermal conductivity is an important material property of the bulk thermoelectrics. To improve ZT a reduced thermal conductivity is always desired. However, there is no standard material for thermoelectrics and the test results, even on the same material, often show significant scatter. The scatter in thermal conducti…
Closed form analytic approximations are proposed for complex impedance (capacitance and Q-factor) of capacitors formed by two coplanar rectangular conducting patches sandwiched between dielectric layers. The computations using proposed formulas are at least an order of magnitude faster in comparison with the commercia…