Materials Literature
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A figure of merit (FOM) Z = U p /τ r , where U p is the peak voltage, and τ r is the rise time of the laser-induced thermoelectric voltage (LITV) signal, is defined for photodetector based on the LITV and the influence of the parameters on FOM is analysed based on the time dependence of LITVs in La 1− x Ca x MnO 3 (LC…
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Single crystals of ZrAs 1.4 Se 0.5 (PbFCl-type structure) were grown by chemical vapour transport. While their thermodynamic and transport properties are typical for ordinary metals, the electrical resistivity exhibits a shallow minimum at low temperatures. Application of strong magnetic fields does not influence this…
A microcalorimeter is studied for testing heat capacity of thin films. The microcalorimeter is a suspended membrane supported by six microbridges, which is fabricated by the front-side surface micromachining. Compared to the bulk micro-machined one, the microcalorimeter has excellent mechanical strength and precisely…
Abstract In this study, cyclic olefin copolymer (COC)/layered silicate nanocomposites (CLSNs) were prepared by the intercalation of COC polymer into organically‐modified layered silicate through the solution mixing process. Both X‐ray diffraction data and transmission electron microscopy images of CLSNs indicate most…
Abstract A regioselective synthetic route that allows the construction of tri‐functionally substituted cyclen is described. This facilitates the synthesis of a europium complex that exhibits a good photoresponse to malate, forming the basis of a chemoselective sensor. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Wei…
The structures of the new compound La(1.2)Sr(2.7)IrO(7.33) and the recently discovered La(1.2)Sr(2.7)RuO(7.33) have been solved using a combination of X-ray and neutron diffraction. Both compounds crystallize in the trigonal space group Rm and consist of isolated MO6 (M = Ru, Ir) octahedra, which are arranged in well-…
Numerical simulation has been carried out to analyze several unique buckling and postbuckling behaviors of superelastic shape memory alloy (SMA) columns observed from experimental evidences. Comparison of the experimental critical load with analytical predictions verifies the fact that physical nonlinearity should be…
Studies on the synthesis of high molecular weight polybenzoxazoles (PBOs) in polyphosphoric acid (PPA) and investigations of their hydrolytic stability in aqueous methanesulfonic acid are described. The polymerization of PBOs based upon 2,2′-bis(3-amino-4-hydroxyphenyl)-hexafluoropropane (6FAP) and 4,4′-oxydibenzoic a…
Examinations of CO2 formed during steady-state CO oxidation reactions were performed using infrared (IR) chemiluminescence. The CO2 was formed using a molecular-beam method over Pd(110) and Pd(111). The CO2 formation rate is temperature dependent under various partial pressure conditions. The temperature of the maximu…
Spatial patterning of an aminosilica surface improves the catalytic properties of an organometallic catalyst. The distribution of the sites on the surface creates a more accessible metal center. This accessibility, when combined with the steric constraints imparted by the silica surface, not only allows for improved r…
We examine RCoO 3 (R=La, Ce, Pr, Nd, Sm, Eu, Gd, and Dy) perovskites prepared with the solid-state reaction method by Raman spectroscopy, and report the Raman active phonons in the RCoO 3 perovskites crystallized in cubic symmetry for RCoO 3 (R=La, Ce, Pr and Nd) and orthorhombic symmetry for RCoO 3 (R=Sm, Eu, Gd, and…
This paper provides a study of signal propagation using the finite difference time domain method. It was presented at the 14th International Symposium on High Voltage Engineering in 2005.
The crystal structure of lead zinc niobate (PZN) was studied by very high-resolution neutron powder diffraction using both small (<143 µm) and large (1–2 mm) crystals. No evidence was found for the rhombohedral exterior/cubic interior 'X-phase' structure reported by Xu et al (2004 Appl. Phys. Lett. 84 3975–7). The str…
ZnO crystals were implanted with N+, O+, and Al+, and co-implanted with O+∕N+ and Al+∕N+ ions. Positron annihilation measurements indicate introduction of vacancy clusters upon implantation. In the N+-implanted and Al+∕N+ co-implanted samples, these vacancy clusters are only partially annealed at 800°C, as compared wi…
Abstract Nickel acetate doped poly(methylphenylsilsesquioxane) with and without silicon filler loading was pyrolysed in argon atmosphere between 800 and 1500 °C. The ceramic residues were investigated with specific view of the nanoaggregates formed in pores during the polymer‐to‐ceramic conversion. After pyrolysis at…
Abstract Summary: Two photochromic dithienylethene units were incorporated into one fluorene unit as a monomer and the mole ratio of photochromic unit/repeat unit reached to 2:1 using this monomer. The content of dithienylethene component in the polymer could be improved effectively by polymerization of this monomer,…
The magnetization of a quasisingle-crystalline ${\mathrm{La}}_{0.75}{\mathrm{Sm}}_{0.25}{\mathrm{Mn}}_{2}{\mathrm{Si}}_{2}$ sample was measured under high pressures to $P=1.2\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$. The compound exhibits four different spontaneous magnetic phase transitions: the ordering of Sm sublatt…
The development status of Ovonic Unified Memory (OUM), a phase-change non-volatile semiconductor memory technology for VLSI stand-alone memory and embedded applications, is discussed. Using 0.18 μm 3 V CMOS, cells from 5F/sup 2/ to 8F/sup 2/ are built in a charge-pump-free 4 Mb development vehicle. Direct overwrite, 1…
The influence of the spontaneous surface modification of titanium by exposure to Ringer's solution at open-circuit conditions on the passive behavior was studied. The electrochemical behavior of Ti was compared in a simple NaCl and in Ringer's physiological solution. Potentiodynamic polarization curves show significan…