Materials Literature
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In order to identify the mechanisms behind the adverse effect of oxygen contamination on the densification of TiB 2 ceramics, densification and grain growth behavior during pressureless sintering (1700° to 2050°C) were examined as a function of oxygen content of the powder and compared with those observed during hot‐p…
A paramagnetic-labeled macromolecule, albumin-(Gd-DTPA), was prepared for use as an intravascular contrast agent for magnetic resonance imaging. An average of 19 Gd-DTPA chelates were covalently conjugated to human serum albumin through the bifunctional anhydride of DTPA. The albumin-(Gd-DTPA) was characterized with u…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT.pi.-Bond strengths in the second and third periodsMichael W. Schmidt, Phi N. Truong, and Mark S. GordonCite this: J. Am. Chem. Soc. 1987, 109, 17, 5217–5227Publication Date (Print):August 1, 1987Publication History Published online1 May 2002Published inissue 1 August 1987ht…
The control of isocitrate dehydrogenase through phosphorylation is necessary for growth of Escherichia coli on acetate as the sole carbon source. To understand the mechanism by which phosphorylation inactivates isocitrate dehydrogenase, the sequence of icd, the isocitrate dehydrogenase structural gene, was determined…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescence properties of organometallic complexesAlistair J. LeesCite this: Chem. Rev. 1987, 87, 4, 711–743Publication Date (Print):August 1, 1987Publication History Published online1 May 2002Published inissue 1 August 1987https://pubs.acs.org/doi/10.1021/cr00080a003https:…
Porosities of porous silicon layers formed on different types of substrates and under different experimental conditions are compared with and related to the pore size distribution determined by gas adsorption experiments. Results show that porous layers formed on lightly P‐doped silicon exhibit a network of very narro…
Electrochemical and physical aspects of the dissolution of hydrogen in niobium with an ideal or a real structure are discussed. The interactions of hydrogen with various crystal lattice defects and the changes in physico-mechanical characteristics of niobium caused by hydrogenation are analysed. Data on the kinetics a…
The principal advances in the theory and practice concerning the initial stages of the electrocrystallisation of metals are considered. The thermodynamic and kinetic relations for the phase formation processes in electrochemical systems and the influence of the kinetics of the discharge of ions and of the adsorption o…
An analysis has been made of the linear response of polarization to a uniform change in temperature, in its gradient (thermal polarization effect), in macroscopic deformation and in its gradient (flexoelectric effect). It has been shown how the use of some definitions of polarization widespread in the literature can l…
Microcrystalline samples of BC8 silicon III and hexagonal silicon IV, grown under high pressure in the diamond anvil cell, remain metastable at ambient pressure. Hall-effect and low-temperature resistivity measurements show Si III to be a hole semimetal with p\ensuremath{\approxeq}5\ifmmode\times\else\texttimes\fi{}${…
Neutron diffraction measurements were made on artificial superlattices of CoO-NiO, (CoO)m(NiO)n×l prepared on the (0001) surface of α-Al2O3. (111) layers of CoO and NiO, each less than 2 nm thick (2≤m,n≤8), were stacked alternatively to a total thickness of less than 70 nm (m+n≤15,l≤25). A well-defined magnetic Bragg…
While there is no fundamental reason that fluids should not be ferroelectric the only known ferroelectric fluids are chiral smectic-C liquid crystals. In this paper we argue that a variety of nonchiral layered (smectic) phases composed of properly designed oligomeric or polymeric molecules will also be ferroelectric.…
Heavily doped ZnO:Al films were made by dual-target reactive magnetron sputtering. Spectrophotometry in the 0.3–50 μm range proved that the films were suitable for energy-efficient windows. The optical data could be reconciled with a theory involving a free-electron gas damped by ionized impurity scattering.
An Al−0.3 wt% Li alloy is irradiated to thermal neutron doses of 6 × 1018, 1.2 × 1019, and 1.0 × 1020 neutrons cm−2 at ≈75 °C producing varying distributions of inert gas bubbles. The specimens are creep tested at 300 °C and the steady-state creep rates, \documentclass{article}\pagestyle{empty}\begin{document}$\dot\va…
An internal friction peak (P1) is measured at 5 and 50 kHz without thermal hysteresis near the ferroelastic transition temperature Tc of LNPP single crystal. The mechanism of internal friction due to a second-order transition is suggested. Experimental results show that the density of domain walls, N, in the ferroic p…
Polarization and angle-of-incidence dependences of the surface-enhanced Raman scattering (SERS) signal of benzoic acid adsorbed on isolated oblate particles of silver have been measured in an attenuated-total-reflection geometry. Simultaneously, the absorption of photons in the particles has been determined by a photo…
Magnetization measurements in high-pulsed magnetic fields have revealed the presence of magnetic anisotropy in the hard basal plane of a single crystal of Nd2Fe14B. A discontinuity in the magnetization occurs when the magnetic field is applied along the [100] direction in the hard basal plane below 220 K while there i…
The microscopic structure of the paramagnetic anion antisite defect in semi-insulating GaAs was determined by optically detected electron-nuclear double resonance (ODENDOR). It is an arsenic-antisite--arsenic-interstitial (${\mathrm{As}}_{\mathrm{Ga}}$-${\mathrm{As}}_{\mathrm{i}}$) pair. It is shown, by optically dete…
Third harmonic generation (THG) has been performed in reflection from thin polycrystalline films of chloro-gallium and fluoro-aluminum phthalocyanines. By comparison to THG from the 100 surface of silicon, the values of χ(3) are estimated to be 2.5×10−11 and 5×10−11 esu, respectively. The patterns of the molecular and…
${\mathrm{Nd}}_{1+\mathrm{\ensuremath{\epsilon}}}$${\mathrm{Fe}}_{4}$${\mathrm{B}}_{4}$ crystallizes with the tetragonal ${\mathrm{Sm}}_{1+\mathrm{\ensuremath{\epsilon}}}$${\mathrm{Fe}}_{4}$${\mathrm{B}}_{4}$ structure type. It is characterized by two interpenetrating metal substructures with incommensurate translatio…