Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Electrical properties of Ir/IrO2/PZT/Ir/IrO2 and IrO2/Ir/PZT/Ir/IrO2 capacitors were investigated. SIMS analysis showed that the Ir/IrO2 bottom electrode acted as a good barrier layer of the interdiffusion. Ir/IrO2/PZT/Ir/IrO2 capacitors did not show good electrical properties due to plasma damage during top electrode…
Molecular weight distribution obtained by gel permeation chromatography (GPC) conceals a wealth of mechanistic information which can be disclosed only after adequate data treatment. This paper discusses how GPC chromatograms may be used for the elucidation of polymer degradation kinetics. The case of ultrasonic degrad…
Abstract A mineralogical and microstructural study of bentonites from 'Cerro del Aguila' located in the Tagus Basin (Toledo, Spain) was carried out using XRD, SEM and TEM observations and chemical data obtained by TEM-EDX. The bentonites are mainly composed of trioctahedral smectite with a unit-cell formula (Si 3.76 A…
Abstract Cambrian and Ordovician pelites and greywakes from the Iberian Range were studied using XRD, EMPA and AEM/TEM techniques, lllite and chlorite are the main phases in Cambrian <2 µm fractions. Illites show crystallinities (IC) from 0.28 to 0.23°2θ the 2 M 1 is almost the only polytype; they do not have expan…
Abstract The crystal structure of dipotassium hexaaquacobalt(II) sulfate, K 2 [Co(H 2 O) 6 ](SO 4 ) 2 , has been determined at room temperature by single crystal X-ray diffraction. The deep purple crystals grown from aqueous solution are monoclinic, space group P 2 1 / a , with unit cell dimensions a = 9.057(1) Å, b =…
We have studied the time-dependent uptake of 35S radiolabeled DNA with electrochemically prepared polypyrrole films. The two distinct polypyrrole film surfaces, a rough (solution polymeric growth face, R) and a smooth surface (electrode face, S) were characterized by low-resolution AFM and high-resolution transmission…
An explicit equation for X-ray diffraction by a finite one-dimensional paracrystal is derived. Based on this equation, the broadenings of reflections due to limited size and disorder are discussed. It depicts the paracrystalline diffraction over the whole reciprocal space, including the small-angle region where it deg…
We have grown stoichiometric pure perovskite phase Pb(Mg1/3Nb2/3)O3-PbTiO3 (PMN-PT) thin films and PMN-PT/SrRuO3 heterostructures on miscut (100) SrTiO3 substrates by pulsed laser deposition. X-ray diffraction θ–2θ scans show that the PMN-PT films are purely c-axis oriented. The off-axis Φ scans show that the heterost…
( V 1−x Cr x ) 2 O 3 with x=0.012 exhibits both S- and Z-type switching characteristics in studies of current–voltage curves at temperatures 170–230 K. The effects are linked to electrothermal instabilities and to filamentary conduction. The samples are stable under voltage cycling in appropriate temperature ranges.
The anomalous peak in dielectric constant versus temperature of perovskite CdTiO3 appears at 77 K, which corresponds to the nonlinear D-E hysteresis loop below 80 K. The powder X-ray diffraction profiles at room temperature and 15 K do not change evidently. The indices of the diffraction profiles satisfy the extinctio…
Most of the standard methods for foam stability evaluation are based on measurements of the weight or volume of the liquid collapsed from the foam. However, these drainage methods are insufficient for the evaluation of practical foam stability. Accordingly, we decided to develop a new system for foam stability evaluat…
The components of the gyration tensor of the enzyme lysozyme were measured by using the HAUP method: g11 = -0.90 x 10(-5) and g33 = 1.05 x 10(-5) at 303.4 K and a wavelength of 4880 A. The optical rotatory powers along the a and c axes in the same conditions were calculated: rho a = -21.3 and rho c = -24.8 degrees cm-…
Abstract Two new unique benzoate ester plasticizers that will offer the vinyl formulator improved performance have been developed. One is an excellent solvator that will yield lower plastisol viscosities than existing plasticizers. The other will provide an excellent alternate with low volatility. The new products pro…
In this paper protein crystallization is regarded as a process starting with phase separation in a two-component system. The nucleation time of a lysozyme solution is measured by recording the NMR spectra of crystallizing solutions as a function of time. It is found that there is an appreciable induction time before t…
Healing characteristics of small-caliber vascular prostheses used in small children have rarely been observed because removing specimens are troublesome. Modified Blalock Taussig shunt procedures were performed using small caliber expanded polytetrafluoroethylene (ePTFE) vascular grafts and fabric grafts in 13 patient…
Abstract High molecular weight phosphorus‐containing copolyesters, poly(ethylene terephthalate)‐co‐poly(ethylene DDP) (PET‐co‐PEDDP)s, were prepared and characterized with the objective of producing a non‐halogen flame retardant system for practical applications. The phosphorus‐containing copolyester with 30 wt% phosp…
Detailed equivalent circuit models of ferroelectric and high-permittivity dielectric capacitors are required for the development of FeRAM and ultra-dense DRAM devices. This review comprises the frequency dependence of C-V and P-V characteristics, grain size effects, electrode interface effects, as well as reversible a…
XAFS measurements (LURE and NSLS) of ${\mathrm{Se}}_{1\ensuremath{-}x}{\mathrm{Te}}_{x}$ glasses have been carried out on both the Se and Te $K$ edges at low and room temperatures. Using a multishell best-fit analysis procedure, we have reconstructed the Se and Te local environment: first-shell intrachain nearest neig…
Organic materials for quadratic nonlinear optics generally follow the basic pattern of strongly dipolar quasi one-dimensional intramolecular charge transfer molecules organized in macroscopic crystalline or statistical polar lattices. This restriction has been lifted by the introduction of the much broader class of mu…
Liquids may be used between the magnetic confined fusion plasma and the first wall of the plasma chamber to reduce the material damage through displacements per atom (dpa) and helium gas production. This could extend the lifetime of the first wall in a magnetic fusion energy (MFE) reactor to a plant lifetime of ~30 yr…