Materials Literature
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Considering the dielectric confinement effect on excitonics of PbSe quantum dots (QDs), a correction factor in the wave function was introduced to propose a new band gap calculation model for QDs. The modified model showed great consistency with the experimental data, especially in small size range. According to the v…
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The influence of Ti and Zr impurity atoms on the atomic and electronic structures of a mesoporous SiO2 matrix is ab initio simulated in a generalized gradient approximation. Energetically favorable positions of titanium and zirconium in the structure are revealed. The incorporation of Zr and Ti ions is shown to decrea…
In this article, two concepts of temperature, i.e., Burns temperature for relaxor ferroelectrics and quantum temperature scale for quantum paraelectrics, are reviewed briefly. Since both temperatures describe the deviation of the dielectric constant from Curie–Weiss law, their relationship is discussed. Finally the co…
Jane and David Richardson have worked together since 1964, and their research has made strides in enhancing our understanding of protein structure. Two of the crystal structures they solved are staphylococcal nuclease and copper, zinc superoxide dismutase, both of which were published in the Journal of Biological Chem…
Activated charcoal has been widely used as an odor absorbent in household and water purification industry. Filtration equipment for drinking water generally consists of four parts, which are microporous membrane (porous alumina ceramic or diatomite, or porous polymer), odor absorbent (activated carbon), hard water tre…
Carbon nanotube (CNT) array is a self-organized highly oriented structure, in which CNTs are vertically aligned on the substrate. Superaligned CNT array is a special kind of vertically aligned CNT array with the unique capability of being converted into pure CNT films or yarns simply by drawing in dry state. The as-co…
A 〈110〉 oriented polycrystal Tb0.36Dy0.64(Fe0.85Co0.15)2 was subjected to annealing in a transverse field of 240 kA/m. Axial magnetostrictions (defined as λ∥) of the magnetically annealed specimen were investigated in fields applied at a series of angles θ away from its axis. For the untreated specimen, at the angle θ…
A three-dimensional rate-dependent model has been developed for damage and failure of brittle materials under impact. The model extends a recently developed, crack-mechanics based damage model [Zuo et al., Int. J. Solids Struct. 43, 3350 (2006)] to high rate problems by incorporating a nonlinear equation of state (EOS…
In addition to the decay of magnetization with time that occurs in scalar processes, in vector processes the magnetization must also rotate toward the easy axis. In this model, each hysteron is characterized by a critical surface. The energy of the hysteron is proportional to the size of the difference between the app…
Formation of hexagonal periodic nanoscale structures at the surface of aluminum oxide is considered in the present paper. The mathematical model of chemical reactions at metal-oxide and oxide/electrolyte interfaces is described. A weak nonlinear approximation near the instability threshold results in the two-dimension…
The crystal structure and magnetic properties of layered Fe0.5TiS2 − x Se x (0 ≤ x ≤ 2) compounds intercalated by iron atoms have been investigated. It has been shown that the substitution of selenium for sulfur is accompanied by an increase in the unit cell volume, a transition from the ferromagnetic to antiferromagn…
Currently there is a lot of ongoing research towards estimation the thermal conductivity of carbon nanotubes (CNT). In the current paper thermal conductivity of SWNT were studied by using non-equilibrium molecular dynamics (NEMD) simulations (implemented in Materials Studio software, Accelerys Inc.). The NEMD techniqu…
Liner coverage in the via plays a critical role on via depletion EM for dual damascene Cu interconnects. Poor liner coverage at the via bottom often results in early EM fails. On the other hand, if the liner at via bottom is permeable to Cu diffusion, thanks to the constant Cu supply into the via from the line below,…
The failure ratios of the three typical time-dependent dielectric breakdown (TDDB) failure modes, including top interface, sidewall and bottom corner areas, have been identified for a direct polishing ultra low k (ULK) dielectric Cu back-end-of-line (BEOL) structure at 40nm node. The Cu surface roughness of the metal…
Nano-sized calcium copper titanate (CCTO) powder was derived from sol-gel process. Calcium nitrate, copper nitrate and titanium iso-propoxide were used as raw materials. The XRD results of the powder calcined at 800°C indicated the formation of CCTO phase. AFM studies showed that the particle size of the CCTO powder r…
Heat treatment with mixed martensite-bainite transformation of austenite is optimized in terms of strength and fatigue-crack resistance. For the manufacture of components in impact mechanisms, the best combination of strength, hardness, and crack resistance is obtained for steel in which 40% martensite is formed on in…
This article presents polarized light microscopy studies of the ferroelastic domain structure and the analysis of electron paramagnetic resonance spectra of Cr3+ admixture ions in trigonal double molybdates. The correlation has been found between abnormal EPR lineshape and domain structure in ferroelastic phases of th…
A detailed magnetic study has been carried out for Ti-doped La0.5Ba0.5Co1-xTixO3 (x = 0, 0.05, 0.075, 0.10, 0.125, and 0.15) cobaltites. Ti doping suppresses the ferromagnetic interaction in La0.5Ba0.5CoO3 and induces an antiferromagnetic phase in the system at 0.075≤ x ≤0.15. The spin state of Co ions is not affected…
Data on a study of the activity of brown coals from the Borodino deposit in the Kansk-Achinsk Basin with various mineral matter contents in the course of steam gasification (700°C) are reported. A close correlation of the activity of carbonized coals on gasification with the concentration of native calcium in them was…