Electrical Conductivity of Tetragonal Zirconia below the Transformation Temperature
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Viscosities of molten polymer blends
Abstract Pairs of four thermoplastic resins, polystyrene, poly(methyl methacrylate), acetal homopolymer, and nylon‐12, were intensively melt‐blended in nine proportions from 0 to 100 percent. Capillary rheometry at 210°C was done on each blend; melt densities were also measured on most of them. The dependence of shear…
The crystal structure of bartonite, a potassium iron sulfide, and its relationship to pentlandite and djerfisherite
The structure of a bartonite crystal from Coyote Peak, Humboldt County, California, has been solved and refined in anisotropic mode to a conventional R = 0.068for 504 observed reflections. The tetragonal unit cell [space group 14/mmm, a = 10.424(1), c = 20.626(1)A] contains 2 formula units, which were found by site-oc…
Unwinding of the Helical Texture of a Smectic C* Liquid Crystal, Through Ferroelectric and Dielectric Anisotropic Coupling With an Applied Fiel
A large enough DC or low frequency AC field couples to the permanent polarization P and unwinds the helical texture of a smectic C* liquid crystal.′ From the measurement of the unwinding critical field, one can deduce the value of P. We present here a general model to compute the unwinding critical field; this model t…
Modifications of Cotton Cellulose Surfaces by Use of Radiofrequency Cold Plasmas and Characterization of Surface Changes by ESCA
Radiofrequency (rf) cold plasmas of argon, nitrogen, and air were used to modify cotton fabrics and yarns. Changes in surface characteristics were detected by application of the techniques of electron emission spectroscopy for chemical analyses (ESCA), electron spin resonance, and chemiluminescence. Examples of polyme…
Impurity‐Associated Colour Centres in Mg‐ and Ca‐Doped Al2O3 Single Crystals
Abstract In Mg‐ and Ca‐doped α‐Al 2 O 3 crystals irradiated by X‐rays at 80 K new paramagnetic colour centres are observed having an absorption band at about 255 nm and an emission band at 310 nm. The hyperfine structure of the EPR spectrum indicates that the unpaired electron spin interacts mainly with two Al 27 nucl…
Resistivity recovery in austenitic Fe-Cr-Ni alloys neutron irradiated at 23K
The annealing of the electrical resistivity of two high-purity austenitic Fe-Cr-Ni alloys, and of Si- and Ti-doped samples has been investigated after neutron irradiation at 23K. The resistivity variations (a decrease below 190K, an increase between 190 and 600K, and a decrease above 600K) can be understood in terms o…
Ion fluctuation effects on the two-plasmon decay and stimulated Raman scattering
Secondary Langmuir-wave decay into another Langmuir wave and an ion-acoustic wave is shown to provide a very efficient saturation mechanism for two-plasmon decay and stimulated Raman scattering. Near the quarter critical density, where two-plasmon decay dominates Raman scattering, large ion fluctuations are expected a…
Investigation of axial anionic ligand and porphyrin substituent effects on the oxidation of iron(III) porphyrins: porphyrin-centered vs. metal-centered oxidation
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInvestigation of axial anionic ligand and porphyrin substituent effects on the oxidation of iron(III) porphyrins: porphyrin-centered vs. metal-centered oxidationMartin A. Phillippi, Eric T. Shimomura, and Harold M. GoffCite this: Inorg. Chem. 1981, 20, 4, 1322–1325Publicatio…
Coercive force and 90° domain wall motion in ferroelectric PLZT ceramics with square hysteresis loops
The polarization reversal of some tetragonal-phase PLZT ceramics is studied. The results are explained in terms of 90° domain wall motions. A reported theory originally derived for rhombohedral-phase PLZT 6/65/35 ceramics is shown to be applicable to tetragonal-phase PLZT ceramics also by introducing the remanent degr…
Chemical Characteristics and Origin of Ordovician K-Bentonites along the Cincinnati Arch
Abstract K-bentonites of the Middle Ordovician High Bridge Group along the Cincinnati arch are characterized by interstratified illite/smectite (I/S) clays with rectorite-type ordering. Approximately 20% of the layers are expandable. They are structurally similar to I/S formed at temperatures exceeding 100°C during bu…
Binding of lanthanide ions to troponin C
Tb3+ and Eu3+ bound to troponin C were detected by (1) changes in the fluorescence of the tyrosine chromophore of the protein or (2) the luminescence of the ions themselves excited by energy transfer from the protein or by direct excitation using a pulsed laser light source [Horrocks, W. DeW., Jr., & Sudnick, D. R. (1…
A nonevaporable low temperature activatable getter material
Nonevaporable getters have been widely used for many years in sealed vacuum or controlled atmosphere devices. They are also finding applications in other fields, where specific characteristics are required and tailor-made getters are requested, in some cases sacrificing speed in favor of lower activation temperatures,…
The core structure of 1/3⟨1123⟩ {1122} edge dislocations in h.c.p. metals
A computer simulation has been carried out for the core structure of a 1/3⟨1123⟩ {1122) edge dislocation using the truncated Lennard-Jones (12–6) potential. The core is composed of two distinct structural units which can be interpreted in terms of {1121) and {1122) twins. This core structure differs markedly from that…
Crystal data for β-PbO2
The temperature factor (B = 0.70 Å2) and atomic parameter (x = 0.305) were determined by comparing the observed and calculated powder diffraction data for synthetic β-PbO2. This material is tetragonal with a = 4.961 (2), c = 3.385 (2) Å, and space group P4/mnm.
Lateral interaction effects on the reaction of CO2 and oxygen adsorbed on Ag(110)
The effect of oxygen adatom coverage and order upon the formation of CO3 intermediates via CO2+O(a)→CO3(a) was examined on the Ag(110) surface. The reaction probability for CO2 was found to be strongly dependent upon the oxygen adlayer. Adsorption of CO2 upon an ordered oxygen adlayer at 300 K occurred with a net reac…
Orientation of Discotic Mesophases
The orientation of some fluid (DF) and optically uniaxial columnar (D) discophases by surfaces is examined by optical microscopy. The test materials are 2,3,6,7,10,11 hexa-substituted triphenylenes, including two new compounds exhibiting mesophases at room temperature, and a binary mixture with a DF, phase stable betw…
Thermal Behaviour of the Twist Viscosity in a Series of Homologous Nematic Liquid Crystals
We have measured the twist viscosity Y′(T) by the rotating field method, over the entire nematic range of the 4,4′-di-n-alkoxyazoxybenznes (mOAB) from m = 2 to m = 7. The results of these measurements are presented here together with a new development of our previous theory of γ1(T) which accounts for the free volume…
The atomic structure of dislocations in h.c.p. metals I. Potentials and unstressed crystals
The c/a ratio, vacancy-formation energy, elastic constants and phonon frequencies for metals having the h.c.p. structure are assessed and it is found that, although empirical potentials for individual metals have not as yet been developed, data for most metals are fitted reasonably well by a truncated Lennard—Jones po…
Tungsten-183 NMR and x-ray study of a heteropolyanion [As2W21O69(H2O)]6- exhibiting a rare square-pyramidal environment for some tungsten(VI)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTungsten-183 NMR and x-ray study of a heteropolyanion [As2W21O69(H2O)]6- exhibiting a rare square-pyramidal environment for some tungsten(VI)Y. Jeannin and J. Martin-FrereCite this: J. Am. Chem. Soc. 1981, 103, 7, 1664–1667Publication Date (Print):April 1, 1981Publication Hi…