Materials Literature
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Vielversprechende nanoskopische Funktionseinheiten: Azobenzolpolypeptide können zwischen einer gestreckten trans- und einer kompakten cis-Konformation wechseln. Ihre elastischen Eigenschaften wurden mit Moleküldynamiksimulation untersucht, um die Ergebnisse kürzlicher Rastersondenexperimente auf atomarem Niveau zu erk…
ADVERTISEMENT RETURN TO ISSUECommunication to the...Communication to the EditorNEXTThe Two Crystallization Modes of Mesophase Forming PolymersJuan P. Fernández-Blázquez, Jesús Pérez-Manzano, Antonio Bello, and Ernesto PérezView Author Information Instituto de Ciencia y Tecnología de Polímeros (CSIC), Juan de la Cierva…
A first principles study of an Mn impurity in PbTiO3 and PbZrO3 has been carried out to determine its favorable location and its electronic and magnetic properties. We find that it is energetically favorable for the Mn atom to substitute for Ti∕Zr (as opposed to substituting for Pb and O or to residing in an interstit…
In this work, very high magnetoimpedance measured at frequencies up to 1.8GHz in nanostructured Fe73.5Cu1Nb3Si13.5B9∕Cu films is reported. Magnetoimpedance ratios of 280% and 50% were observed in multilayered and sandwiched samples, respectively. For the last one, the magnetoimpedance ratio exhibited a nearly constant…
The polarization fatigue behavior of ferroelectric Pb1−xBax(Zr0.52Ti0.48)O3 (PBZT) thin films deposited on Pt-coated silicon wafers by sol-gel method is investigated. The fatigue endurance is significantly enhanced upon Ba doping and almost fatigue-free performance up to 1010 switching cycles for PBZT (x=0.1) thin fil…
We report on near-infrared to visible upconversion luminescence in transparent Eu3+-doped SrO-TiO2-SiO2 glass-ceramics. X-ray diffraction analysis indicates that Sr2TiSi2O8 crystallites are precipitated in the glass after heat treatment at 850 degrees C for 2 h. The Eu3+-doped glass-ceramics show strongly enhanced upc…
Abstract The solid‐state morphologies, structures, and chain conformations of poly (ethylene terephthalate) (PET) have been reorganized/altered from those normally produced by solution and melt processing. This has been achieved by two distinct methods: (1) formation of a crystalline inclusion compound (IC) between gu…
We study sputtering by 100eV deuterium irradiation on deuterated amorphous carbon layers at 300K using molecular dynamics (MD) simulations. Two main results are reported here. First, a special mechanism for carbon release—additional to and distinct from the standard definitions for physical and chemical sputtering of…
The high temperature abrasive wear resistant of the composites with different Al2O3 volume fractions, particle coating and size were investigated and the failure action of composites under different conditions at high temperature was analyzed. The results showed that the high temperature abrasive wear resistant of com…
The purpose of this paper is to demonstrate a method of preparation of rod-like β-Si3N4 seeds for self-reinforced silicon nitride ceramics. β-Si3N4 seeds with different size and aspect ratios have been well developed by means of heating the mixture of α-Si3N4 containing various contents of β-Si3N4 powder with certain…
The authors extend their earlier work on the stability of a reacting binary polymer blend with respect to demixing [D. J. Read, Macromolecules 31, 899 (1998); P. I. C. Teixeira et al., Macromolecules 33, 387 (2000)] to the case where one of the polymers is rod-like and may order nematically. As before, the authors com…
Positive and negative deviations from the prediction of Raoult's Law on the composition dependence of a property of binary mixtures are often explained in terms of structure formation and structure breakage, respectively, upon mixing. However, a detailed theoretical description of these ideas seems to be lacking in th…
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…