Materials Literature
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Abstract Chemical, physical, and morphological properties of soils in a representative drainage‐toposequence in central Massachusetts were determined. The soils reflect the acid character of the glacial till derived from granitic materials by the low cation exchange capacity (CEC) and base saturation values, although…
Electromigration in thin film conductors is recognized as a potential wear-out failure mechanism for semiconductor devices. Design guidelines have been established limiting the maximum current densities for aluminum and aluminum alloy conductors. With the development of new lithography and etching techniques enabling…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTN,N'-Bridged porphyrins. Novel synthesis, metal complexes, and conversion into N-monosubstituted porphyrins. Crystal structure of [N,N'-[(benzyloxy)methylene]tetraphenylporphyrin-N'',N''']dibromopalladium(II)H. J. Callot, J. Fischer, and R. WeissCite this: J. Am. Chem. Soc.…
The results of an experimental investigation on reduced models of the influence of core design on core losses are presented. The characteristics of single-phase and three-phase three-limbed cores are compared, and the influence of the core proportions on the core building factor is determined. Four types of T-joint de…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of yttrium octachloroditechnetate nonahydrateF. Albert Cotton, Alan Davison, Victor W. Day, Michael F. Fredrich, Chris Orvig, and Rosemarie SwansonCite this: Inorg. Chem. 1982, 21, 3, 1211–1214Publication Date (Print):March 1, 1982Publication History Published onli…
Magnetic moments and equilibrium lattice constants for the bcc Fe-Co alloy are obtained by means of band-structure calculations using the augmented-spherical-wave method and the local-spin-density scheme. The calculated magnetic moment in Fe-Co does not vary linearly with composition, in agreement with experiment. A r…
Ultrasonic degradations of hydroxypropyl cellulose (HPC) have been carried out in water, ethanol, and tetrahydrofuran (THF) solutions. In the HPC-water system, cavitation intensity did not increase linearly with ultrasound intensity because of a lower threshold of ultrasonic intensity below which cavitation does not o…
Abstract Polypropylene films were produced by solidification during high‐rate (>10 4 s −1 ) melt drawing. Small‐angle x‐ray scattering (SAXS) data were collected during interruptions of the annealing of these films. Fibrillar crystallization took place during the melt‐drawing process. The fibrils exhibit an axial d…
Intrinsic demagnetization curves and the temperature dependence of specific magnetization states were measured with a dc magnetometer on four types of sintered rare-earth-cobalt permanent magnets at temperatures from 300 to 1000 K. All magnetic properties vary reversibly with temperatures up to limits of 650–850 K, de…
Abstract Middle Pennsylvanian fossils from the Buckhorn Asphalt quarry of Southern Oklahoma are unusual in that early sealing by tar has preserved many of their original textural and mineralogic features and those of the earliest stages of diagenesis. Echinoderm fragments collected from this locality axe well preserve…
The ternary Ce2Co17-based systems in which Co is replaced by Ti, V, Cr, Mn, Fe, Cu, Zr, and Hf have been studied to ascertain the effect of substitution on their magnetic and crystallographic properties. X-ray diffraction experiments indicate that Mn and Fe stabilize the rhombohedral Th2Zn17 structure, while Ti, V, Cr…
Electrical and optical properties of reactively sputtered tungsten oxide films have been investigated in relation to the oxygen concentration in sputtering atmosphere. The films with 5200–6600 Å thick were prepared under a constant pressure of 5×10−3 Torr using a mixture of Ar and 4–50% O2. Electrical resistivity and…
The highly accurate core level binding energies measured by Fermi-level Referenced ESCA (FRESCA) have been compared with those of Auger Electron APS (AEAPS) and XPS. The FRESCA and AEAPS measurements directly measured energies with respect to the Fermi-level and are not subject to the instrumental uncertainties charac…
Abstract The glass transition temperatures for a series of high-1,4 linear and star-branched polyisoprenes have been measured by differential scanning calorimetry. The Fox-Flory relation for the linear polyisoprenes was found to be T g =T g ∞ −1.76×10 4 M n −1 . The influence of hydroxyl groups on T g was also examine…
Equations of motion of the Landau-Lifshitz type are used together with the free-energy expression of an earlier publication [D. L. Fox et al., Phys. Rev. B 21, 2926 (1980)] to derive expressions for dynamic phenomena in the low-temperature phase of BaMn${\mathrm{F}}_{4}$. The magnon frequency decreases and the optical…
The crystal structures of (NH 4 ) 2 ZnCl 4 at 418 K (Phase I), 333 K (Phase II) and 298 K (Phase III, antiferroelectric) were determined from X-ray diffraction data, and were compared with that at 223 K (Phase IV, ferroelectric). The space groups and final discrepancy factors are P m c n and 0.052 at 418 K, P c 2 1 n…
A thin, amorphous LiAlF4 film, with lithium ion conductivity of 1×10−4 S/m at 25 °C, has been prepared by vacuum evaporation. Utilizing this thin film as a solid electrolyte, an ITO/WO3/LiAlF4/LiIn overlayer has been constructed (ITO: indium-tin-oxide). For it, the electrochromism of WO3 due to lithium ion injection w…
ABSTRACT Rhoicosphenia Grun. has been placed by some authors in the monoraphid group with Achnanthes Bory and Cocconeis Ehrenb., and by others near Gomphonema Ehrenb. In order to clarify the systematic position of the genus, the morphology and anatomy of the vegetative cells of Rh. curvata (Kütz.) Grun. were investiga…
The effect of the strong Hund coupling on the magnetic property of the ground stateis studied based on the double exchange model. For one dimensional chains the ground state is proved to have the maximum total spin. The effect of the Pauli principle is shown to destroy the ferromagnetic ground state by numerical studi…
We have enlarged the theory of ferromagnetic domain wall pinning by defects to include large as well as small deviations of the magnetic anisotropy, magnetization, and/or magnetic exchange energy of the defect, from the host material for all values of the defect width. In particular, we obtain results for the coercive…