Materials Literature
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The friction behavior of Ti3SiC2 sliding against low carbon steel was studied. Tests were carried out on a block-on-disk type friction tester, with the normal pressures from 0.2 MPa to 0.8 MPa and the sliding speed of 20 m/s. The results showed that, irrespective of the normal pressure, the friction coefficient exhibi…
In this work ion conductivity and FC application were studied for the new type composite material based on SDC (samarium doped ceria) and Li2SO4. Significant conductivity enhancement was achieved, e.g. 10-2 – 0.4 Scm-1 for the SDC-Li2SO4 compared to 10-4 -10-2 Scm-1 for the SDC between 400 and 650°C. Some ion conducti…
The complete structural characterization of the hexagonal cobaltite BaMn 0.4 Co 0.6 O 2.83 has been performed by combining high-resolution transmission electron microscopy and electron and neutron diffraction. The structure is closely related to the 12H (cc‘chhh) 2 with oxygen deficient cubic c‘-BaO 2 layers. This fra…
Porous ceramics green bodies of silicon carbide were formed by freeze-casting of silicon carbide/carbon black aqueous slurries in a mold where temperature distribution was controlled. The influence of solid loading on the pore structure of green bodies was investigated. Pore morphology of green bodies formed from slur…
Stress migration (SM) behavior in Cu damascene interconnects was investigated in detail using different kinds of test patterns. SM failure was found in narrow lines that are very long, or connecting to a wide line. In the pattern in which narrow lines are connected to wide metal, the failure rate decreased as the narr…
Abstract The elastic properties of two‐dimensional (2D) cyclic trimers, each constituted of three soft polydisperse disks interacting by n ‐inverse‐power‐potential, were numerically determined for the static case (i.e. at temperature T = 0). The influence of a structural disorder (polydispersity of the disk sizes) on…
The stress-optical and thermal-optical coefficients of Nb2O5 in thin film narrow bandpass filters (NBPFs) are determined by using the experimental data of temperature-dependent shift of center wavelength. The five-cavity subnanometer NBPFs under consideration are made by the same Nb2O5 and SiO2 film materials but depo…
The morphologic (N 2 adsorption and SEM), structural (XRD and FT−IR), redox (TPR/TPO cycles), acidic (TPD of 2-phenylethylamine), and surface (XPS) properties of supported CuO phases on niobic acid (Nb 2 O 5 · n H 2 O, labeled as NBO) and niobium phosphate (NbOPO 4, labeled as NBP) materials were presented together wi…
The energy optimum chiralities of neighboring layers of a multiwalled carbon nanotube (MWNT) are found to correlate with each other. Nearly identical chiralities are energy optimum in MWNTs with a large diameter. For a small tube, the chiral angle ratio of the outer to inner tubes decreases monotonically with decreasi…
In this paper, the charge flipping method is proposed for ab initio structure determination using neutron diffraction data alone. For this purpose, a new variant of the dual-space iterative algorithm is introduced, which is called band flipping. Unlike the basic algorithm, it reverses the sign of scattering density on…
We present a fast and accurate method for measurement of the twist elastic constant of nematic liquid crystals using pi-cell devices. We observe that there are two bifurcations during the transition from the bend state to the planar 180° twisted state, each of which leads to a voltage threshold. The Fréedericksz thres…
A new solid solution of (1− x )Ba(Mg 1/3 Nb 2/3 )O 3 − x PbTiO 3 [(1− x )BMN− x PT] has been synthesized in the form of ceramics by solid-state reactions and characterized by means of X-ray diffraction, dielectric spectroscopy, and ferroelectric measurements. A partial solid-state phase diagram of the binary system is…
Abstract The anionic lanthanide‐sodium‐2,6‐di‐ tert ‐butyl‐phenoxide complexes [Ln(OAr) 4 ][Na(DME) 3 ]·DME (Ln = Nd 1 (neodymium), Sm 2 (samarium), or Gd 3 (gadolium); DME = dimethoxyethane) were synthesized by the reaction of anhydrous LnCl 3 with 4 equiv of sodium‐2,6‐di‐ tert ‐butyl‐phenoxide NaOAr in high yields…
Thermoviscoelastic linear-response functions are calculated from the master equation describing viscous liquid inherent dynamics. From the imaginary parts of the frequency-dependent isobaric specific heat, isothermal compressibility, and isobaric thermal expansion coefficient, we define a "linear dynamic Prigogine-Def…
The structure of liquid $\mathrm{Ge}{\mathrm{Sb}}_{2}{\mathrm{Te}}_{4}$ alloys is investigated using first-principles molecular dynamics at three densities: the experimental one and two other densities, 7% and 15% lower, respectively. Contrary to what has been reported for amorphous phases, no departure from an octahe…
Electromigration failure statistics and the origin of the log-normal standard deviation for copper interconnects were investigated by analyzing the statistics of electromigration lifetime and void size distributions at various stages during testing. Experiments were performed on 0.18μm wide Cu interconnects with tests…
The photophysical properties of a group of Ni(II)-centered tetrapyrroles have been investigated by ultrafast transient absorption spectrometry and DFT/TDDFT methods in order to characterize the impacts of alpha-octabutoxy substitution and benzoannulation on the deactivation pathways of the S1(pi,pi*) state. The compou…
Abstract Supramolecular inclusion complexes (ICs) involving polyhedral oligomeric silsesquioxane (POSS) capped poly(ϵ‐caprolactone) (PCL) and α‐cyclodextrin (α‐CD) were investigated. POSS‐terminated PCLs with various molecular weights were prepared via the ring‐opening polymerization of ϵ‐caprolactone (CL) with 3‐hydr…
Magnetoelectric resonance behavior of a simple, bilayered structure of Pb(Zr,Ti)O3 ceramic chip and (Tb,Dy)Fe2∕epoxy mixture layer is investigated. Our results show that there occur three kinds of resonance, which are attributed to the first-order flexural, second-order flexural, and radial resonance modes, respective…
Characteristics of the frictional layer in high-purity Ti3SiC2 and TiC-contained Ti3SiC2, sliding against low carbon steel, were investigated. The friction and wear tests were made using a block-on-disk type friction tester with sliding speed of 20 m/s and several normal pressures from 0.1 MPa to 0.8 MPa. It was found…