Materials Literature
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Abstract Die Natriumcobaltchalkogenide Na 6 CoS 4 und Na 6 CoSe 4 sind durch isolierte [CoX 4 ]‐Einheiten charakterisiert. Trotz der großen Abstände der magnetischen Zentren von über 6Å führen bei tiefen Temperaturen magnetische Wechselwirkungen zu dreidimensional geordneten Spinstrukturen, die über Neutronenbeugungsu…
Abstract The behavior of PVC plastisols during gelation and fusion was studied by the ATR‐FTIR technique (Attenuated Total Reflectance‐Fourier Transform Infrared Spectroscopy). DBP, DOP, and DIDP, three common phthalate plasticizers for PVC, were used in plastisols formulations. Three heating rates—5, 10 and 15°C/min—…
Abstract Durch Schmelzreaktionen von Alkalicarbonat mit Cobalt und Schwefel im Wasserstoffstrom gelang die Darstellung der Verbindungen K 9 Co 2 S 7 , Rb 9 Co 2 S 7 und Cs 9 Co 2 S 7 . Die Struktur der Kaliumverbindung konnte über röntgenographische Untersuchungen an Einkristallen bestimmt werden (Raumgruppe P2 1 3, Z…
It is commonly known that the magnetostriction of grain oriented silicon steel for electric transformers, is strongly influenced by applied stress on the steel as well as coating stress of the steel and is dominated exclusively by the formation of 90/spl deg/ domain walls. A new concept on a condition for the formatio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of Antiferromagnetic Heteronuclear Thiolate- and Sulfide-Bridged Complexes. 4. Synthesis of Triangular Clusters with CrRe2 and Cr2Re CoresIgor L. Eremenko, Sergei Nefedov, Heinz Berke, Boris I. Kolobkov, and Vladimir M. NovotortsevCite this: Organometallics 1995, 1…
Thin In46Sb54 films were prepared on glass substrates via flash evaporation. Films of 1000 Å were deposited at room temperature. After 7 min of thermal annealing at 450 °C, an average grain size increased from 20 to 200 nm. Under exposure to Fraunhofer diffracted pulsed Nd-YAG laser beam, the films exhibited different…
Abstract The increase of transmission at discrete frequencies (bleaching bands) is observed in porous silicon platelets pumped by picosecond laser pulses. It is attributed to a saturation of optical transitions between the energy levels of electrons and holes spatially confined within quasi‐zero‐dimensional (quantum d…
Pitting potentials, , and protection potentials, , have been determined for α‐brass (33% Zn) using a cyclic polarization method. Increasing the F − concentration shifts the critical potential to more active values. The pitting potentials, , and protection potentials, , depend on the logarithmic concentration of F − io…
Several studies have suggested that grafts from membranous derived bone (e.g., calvarial grafts) retain their volume better than those from endochondral derived bone (e.g., iliac bone grafts). Increased osteogenesis in grafts of the former type has been offered as the explanation. However, simple volume measurements o…
High-brightness blue and green light-emitting diodes (LEDs) based on II–VI double heterostructures (DHs) have been successfully grown by molecular-beam epitaxy (MBE) on (100) ZnSe substrates. These LED structures consist of a 500–1000 Å thick active region of undoped blue-emitting Zn0.9Cd0.1Se/ZnSe multiple quantum we…
A double dislocation pole model is proposed for deformation twinning in f.c.c. lattice structures. Operation of the twinning source proposed occurs when the passing stress that poses a high energy barrier to the nucleation and growth of a twin is surmounted by thermal activation. Orowan stress barriers are also involv…
Abstract The linear viscoelastic behavior of commercial broad‐distribution polypropylenes is studied. The samples underwent different controlled peroxide degradation rates, so they exhibit different molecular distributions. The relaxation spectrum is obtained by assuming that it takes the shape of a Log‐Normal distrib…
Room-temperature green luminescence has been studied in laser-modified (darkened) CdS nanocrystals with the average radii a ranging above the exciton Bohr radius (from 3.3 nm to 100 nm). Under high picosecond-pulse excitation, the electron-hole plasma decay kinetics exhibited a decrease of lifetime with decreasing cry…
Abstract A description is given of the unit group for the two groups G = D 12 and G = D 8 × C 2 . In particular, it is shown that in both cases the bicyclic units generate a torsion-free normal complement. It follows that the Bass-cyclic units together with the bicyclic units generate a subgroup of finite index in for…
To examine the effects of triploidy on rainbow trout myogenesis in vitro , mononuclear cells were liberated enzymatically from the lateralis muscles of diploid and triploid trout. The muscle of diploids yielded 1 × 10 6 ± 1 × 10 5 (± s.e.m. ) mononuclear cells g −1 muscle compared to 0.7 × 10 6 ± 8 × 10 4 cells g −1 f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMorphology of n-type macroporous silicon: doping density dependenceE. Galun, C. Reuben, S. Matlis, R. Tenne, and C. Levy-ClementCite this: J. Phys. Chem. 1995, 99, 12, 4132–4140Publication Date (Print):March 1, 1995Publication History Published online1 May 2002Published inis…
Within this work we present Brillouin and ultrasonic investigations performed on the liquid crystals p-methoxybenzylidene p-(n-butylaniline) (MBBA), p-azoxyanisol (PAA), 4-cyano-4-n-alkylbiphenyles (nCB), and 4-n-pentoxybenzylidene-4'-n-octoaniline (5O.8). Special attention has been paid to the evolution of a signific…
Abstract— Corrosion fatigue crack growth rates in high strength steel are often increased when a large cathodic polarization is applied. The corrosion fatigue mechanism in this case is generally considered to be due to hydrogen embrittlement. In the present study the crack growth process was carefully monitored by tak…
The origin of cyclic fatigue in two Ce‐TZP/Al 2 O 3 composites was investigated by (a) measurements of residual stresses in the transformation zones and crack‐tip stress intensities in in situ loaded compact specimens using microprobe Raman spectroscopy, (b) examination of the crack‐tip transformation zones by transmi…
Abstract The processing behavior and morphology are investigated for nonreactive and reactive nylon/ethylene-propylene rubber blends. The nylon (PA) is a partially aromatic amorphous nylon with amine termination. The rubbery phases are an ethylene-propylene rubber (EP) and a similar ethylene-propylene rubber (EP-MA) w…