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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of Polystyrenes of Extremely High Molecular WeightsBernd Appelt and Günther MeyerhoffCite this: Macromolecules 1980, 13, 3, 657–662Publication Date (Print):May 1, 1980Publication History Published online1 May 2002Published inissue 1 May 1980https://pubs.acs.…
Elastic and vibrationally inelastic differential, integral and momentum-transfer cross sections for electrons scattered by CO 2 molecules are reported at 4, 10, 20 and 50 eV impact energies. The elastic cross sections are placed on an absolute scale by means of a relative flow technique. The inelastic cross sections a…
Dynamic models of crystal surfaces have provided new insights into the crystal growth process. The effects of surface roughening, dislocations, and impurities have been assessed. Certain impurities have been found to cause a larger increase in the growth rate than screw dislocations.
Abstract The refractory group VIA metals generally exhibit intergranular brittleness when they are in the recrystallized condition. This causes severe problems in their fabrication and places major limitations on their practical application. The phenomenon, generally referred to as recrystallization embrittlement, res…
ENDOR measurements at 25 K have been used to determine the hyperfine coupling tensors for all ten protons in the VO(H2O)5 2+ ion in single crystals of Mg(NH4)2(SO4)26H2O. The traceless components of all the tensors are close to axial and their use in a point dipole treatment enables a very plausible geometrical model…
The resistance of single crystals of NbSe 3 under pressure, between 1.2 and 70K has been measured in magnetic fields up to 180 kG. The CDW which appears at ambient pressures at 59K, is totally suppressed for pressures greater than 5.5 kbar. At this pressure NbSe 3 is fully superconducting as shown by a total Meissner…
The binding energies of all core levels in the M and N shells for the elements Zr to Te (except Tc) the M V level of Y have been measured by means of ESCA. The binding energies obtained are compared to previously reported values. The Tc binding energies are estimated through an interpolation between the neighbouring e…
The reversible phase transformation of potassium sulphate is studied. Differential thermal analysis, dilatometric and dielectric measurements show the occurrence of a reversible phase transition at 571 °C for K2SO4 with heat of transformation H = 2.3 kcal/mol and activation energy E = −215 kcal/mol. The thermal hyster…
A major problem in the nuclear industry is the dissolution of refractory plutonium dioxide. Of all of the metal oxides capable of producing reasonably concentrated solutions in dilute acids, plutonium dioxide is one of the most, if not the most, difficult to dissolve. The difficult task of dissolution of PuO 2 on a pr…
The reflectivity of a thin partially oxidized Cu film is measured as a function of the photon glancing angle around the critical angle of total reflection and as a function of energy around the K absorption edge of Cu. Above the edge fine structures are observed in the energy dependent spectra which are related to the…
The degradation oj austenitic stainless steel heated at high temperature under high pressure oj hydrogen was investigated with riference to the metaliurgicalJactors. Main results obtained are as Jollows :
Tb2(MoO4)3 is orthorhombic below Tc=436 K with space group Pba2 and tetragonal above with space group P4̄21m. The crystal structure, previously studied at 298 K, has been determined at four higher temperatures. The integrated intensities of 2909, 1325, 1340, and 1310 symmetry-independent structure factors were measure…
A Monte Carlo study of the structure, equilibration, and glass transition of a model of BeF2 is described. The system consists of 54 ions in a box of side 8.949 Å. The Ewald sum is approximated by the spherically symmetric part and the repulsive potential is of exponential form. The resulting fluid is motionally hinde…
The method utilized for the calculation of the dipolar contribution to crystal-field parameters (cfp) is outlined and applied to the case of neodymium oxide and neodymium oxysulfide. The slowly converging electric field and electric-field gradients necessary for deriving induced moments are calculated by Ewald's metho…
The theory for the fluorescence emission anisotropy [r(t)] of a cylindrical probe in a macroscopically aligned uniaxial liquid crystal (e.g., an oriented membrane) is developed for the situation where the equilibrium orientational distribution of the probes is not random. Expressions are derived for r(0) and r(∞) invo…
This paper formulates the theory of large-angle inelastic electron scattering from vibrational motions of the crystal surface. We focus attention on the scattering from an ordered overlayer of adsorbed molecules, but the formulation developed here is applicable to a variety of other situations, so long as the surface…
Coatings of cholesteric liquid crystals (CLCs) have properties of narrowband optical filters. It has been proposed and tested experimentally that superimposed coatings of left- and right-handed CLCs double the peak reflectance from 0.5 to 1.0. In an alternate method a halfwave plate inserted between two coatings of le…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text J. J. Snyder, "Algorithm for fast digital analysis of interference fringes," Appl. Opt. 19, 1223-1225 (1980) Export Citation BibTex Endnote (RIS) HTML…
The steady-state radiation-induced conductivity (RIC) has been measured in single-crystal ${\mathrm{Al}}_{2}$${\mathrm{O}}_{3}$ samples maintained at elevated temperatures during continuous irradiation with 1.5-MeV electrons. As the temperature increases from 300 to 1300 K there are regions in which the RIC increases…
KNaSO4: trigonal, P3ml , a = 5.6066 (7), c = 7.177(1) A, Z = 2, D x = 2.69 Mg m -a. K3Na(SO4)2: trigonal, P3ml, a = 5.6801 (6), c 7.309 (3) A, Z = 1, D x = 2.70 Mg m -3. Crystals of both compounds were synthesized by heating a mixture of K2SO 4 and Na2SO4 in a Pt crucible at 1273 K for 2 h. Colourless transparent pris…