Materials Literature
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The peculiarities of evolution of domain structure in uniaxial ferroelectric lead germanate during switching under the train pulses of strong field are investigated. The contribution of different mechanisms in switching process are discussed.
An antireflective coating on Ge which combines a polycrystalline diamond film with a surface relief (moth eye) structure has been designed and successfully fabricated. This progressive gradation in the effective refractive index between air and the substrate has reduced Fresnel reflection losses to below 1%. This prov…
Abstract The dissolution of two Ca 2+ -exchanged nontronite samples has been studied in 10% HCl. Early acid-dissolution studies (Osthaus, 1954) have indicated that after two hours of dissolution most of the octahedral Fe 3+ ( VI Fe 3+ ) would be removed leaving mainly tetrahedral Fe 3+ ( IV Fe 3+ ) in the nontronite s…
Abstract Hydroxy-interlayered vermiculite (HIV) is a ubiquitous phyllosilicate in the <0.05-mm fraction of sandy soils on the U.S. southeastern coastal plain. Extensive areas of soils with abundant HIV (i.e., peninsular Florida) have no detectable mica; yet the coarseness, platy habit, and nonexchangeable K associa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon-13 NMR investigation of a poly(urethane-urea) systemDavid T. Okamoto, Stuart L. Cooper, and Thatcher W. RootCite this: Macromolecules 1992, 25, 3, 1068–1073Publication Date (Print):February 1, 1992Publication History Published online1 May 2002Published inissue 1 Febru…
The microstructures and magnetic properties of Fe-(Ta, Nb, Zr)-N alloy films near the eutectic composition were studied. These new soft magnetic alloy films were prepared by N2reactive sputtering. The structures and magnetic properties were changed by annealing or by adjusting the ratio of the N2partial pressure to th…
The room‐temperature mechanical properties of a SiC‐fiberreinforced reaction‐bonded silicon nitride composite were measured after 100 h treatment in nitrogen and oxygen environments to 1400°C. The composite heat‐treated in nitrogen to 1400°C showed no appreciable loss in properties. In contrast, composites heat‐treate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of unsaturated dihydrido carbonyl complexes of manganese(I) with nitriles and isonitriles. Preparation and characterization of the first binuclear .mu.,.eta.1,.eta.2-NCR derivativesFrancisco J. Garcia Alonso, Manuel Garcia Sanz, Victor Riera, Adela Anillo Abril, An…
Abstract In a search for new types of polymer architecture, we have examined systems where one couples rigid‐rod monomers with multifunctional tie‐point monomers. High surface area (400–1000 m 2 /g) polymeric carbinols result from reaction of 4,4′‐dilithiobiphenyl, as well as other multi‐lithiated aromatic compounds w…
<div class="htmlview paragraph">This paper describes the findings of a laboratory effort to demonstrate improved automotive exhaust emission control with a cold-start hydrocarbon collection system. The emission control strategy developed in this study incorporated a zeolite molecular sieve in the exhaust system…
We have measured the density of liquid sulfur as a function of temperature near the polymerization temperature. We measure between 424 and 445 K, with a precision in density of 2×10−5 and an accuracy of 5×10−4. We see upward shifts of the density within 3 K of the polymerization temperature of about 8×10−4 with each c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and physical properties of poly(aryl ether phthalazine)sRina Singh and Allan S. HayCite this: Macromolecules 1992, 25, 3, 1025–1032Publication Date (Print):February 1, 1992Publication History Published online1 May 2002Published inissue 1 February 1992https://pubs.a…
<div class="htmlview paragraph">The magnesium alloy AE42 (nominally a 4 % aluminum, 2 % rare earth alloy of magnesium) is a developmental die cast alloy with good strength and creep resistance at elevated temperatures. Standard salt spray corrosion tests have been used with controlled purity AE42 die castings to…
Specimens of both natural (Monte Somma) and synthetic Na-rich nepheline have been used to synthsize two ion-exchange series, ranging in composition to pure kalsilite. Excess Si in the natural and synthetic series was 5.2 and 1.7 mol% respectively. The associated vacancies in the alkali sites were found to play an impo…
Neovascularization plays a major role in prosthetic vascular graft healing. New developments in manufacturing biomaterials have encouraged the use of biological and biosynthetic materials for both arterial replacement and bypass procedures. We have analyzed in vivo the process of neovascularization and incorporation o…
The structure of the intermetallic compound A13Zr has been studied at 293 K by single-crystal X-ray diffraction (Mo Ka radiation, ,~ -- 0.71069 A), powder neutron diffraction {A[Ge(711)] = 1.0867 A} and convergent-beam electron diffraction (CBED) (200 keV, A = 0.0251/k). The structure of AI3Zr comprises four close-pac…
Abstract Terra rossa samples were taken from the B horizons of soil profiles and from cracks within limestone in Italy. The average annual temperature (AAT) of the sites ranged from 8.4 to 20.3°C and the average annual precipitation (AAP) from 511 to 3113 mm, with either a 5–6 month water deficit or a large water surp…
The synthesis and luminescence characteristics of Eu 2+ activated calcium magnesium chlorosilicate, Ca 8 Mg ( SiO 4 ) 4 Cl 2 , have been reported and analyzed. The emission spectrum of Eu 2+ is composed of two separate bands with peaks at 507 and 428 nm, which result from the Eu 2+ centers in different crystallographi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSonochemistry: some factors that determine the ability of a liquid to cavitate in an ultrasonic fieldArnim Henglein, Daniel Herburger, and Maritza GutierrezCite this: J. Phys. Chem. 1992, 96, 3, 1126–1130Publication Date (Print):February 1, 1992Publication History Published…
Excited state absorption (ESA) spectra were measured for the 4I11/2? 4F7/2 transition at 980 nm in Er-doped fluoride and fluorophosphate glass, by varying the pump wavelength from a tunable Ti:sapphire laser and monitoring the relative strength of the green upconverted fluorescence. The ESA cross section spectra are t…