Materials Literature
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The 4A2 ground state of tetrahedrally coordinated divalent cobalt ions in Cs3CoCl5 and Cs3CoBr5 is investigated with magnetic-susceptibility measurements and paramagnetic resonance in pulsed magnetic fields up to 90 kOe at frequencies in the 70- and 120-Gc/sec bands. The first excited state (4T2) which lies ∼3000 cm−1…
Measurements have been made on the gross-ionization cross sections for 0.1–20-keV electrons on water vapor at pressures of about 3×10−4 torr. The results are compared with the cross sections of H2 and O2. Within the experimental error of 15% we found no deviations from the additivity rule. The energy dependence of the…
We present a theory for how a shear stress alone can induce structural changes in a glassy polymer to break up the rigidity of the glass and allow flow. We consider a molecular model in which the shear-stress field is introduced as a bias on the rotational conformation of backbone bonds. It is argued that the fraction…
The arrangement of atoms around an edge dislocation in copper has been calculated by a variational method using a central-force approximation. The pairwise interaction between discrete atoms was represented by a Morse potential function. In the calculation of the complete dislocation, the atoms were not permitted to r…
Formation and migration energies and atomic configurations have been calculated for interstitials and vacancies in an fcc lattice, and the interaction of close Frenkel pairs has been studied. A mathematical model was used in which the atoms in a spherical crystallite of about 530 atoms are treated as individual partic…
Infrared reflectivity measurements have been made on SrTi${\mathrm{O}}_{3}$ at 300 and 85\ifmmode^\circ\else\textdegree\fi{}K and on BaTi${\mathrm{O}}_{3}$ at 300 and 475\ifmmode^\circ\else\textdegree\fi{}K. Analysis of these and other data shows that the lowest frequency transverse mode shifts in a manner consistent…
A report is given of a theoretical and experimental investigation into the degree of plasmon damping in metals as a function of momentum transfer. A previous theoretical result by DuBois is corrected and extended by taking into account polarization effects. Measurements are reported of the change in half-width $\ensur…
Measurements are reported of the inelastic scattering cross sections associated with the characteristic energy losses of 20-keV electrons transmitted through thin films of Al, Be, and polystyrene. These measurements have been made using two techniques which overcome several sources of systematic error in previous meas…
In this second part of a study of the spin-lattice relaxation rate ${{T}_{1}}^{\ensuremath{-}1}$ in the temperature range $1.2\ensuremath{\leqq}T\ensuremath{\leqq}5\ifmmode^\circ\else\textdegree\fi{}$K of some trivalent rare-earth ions in the salts ${\mathrm{La}}_{2}$${\mathrm{Mg}}_{3}$${(\mathrm{N}{\mathrm{O}}_{3})}_…
In the usual treatment of the temperature dependence of spin-lattice relaxation of impurity ions, the vibrational properties of the paramagnetic ion are assumed to be those of a normal host ion. For impurities that do not affect the vibrational properties of the lattice, this is expected to be a resonable approximatio…
A Peltier–Seebeck or Harman type apparatus has been constructed to measure the Seebeclc coefficient, α, thermal conductivity, κ, electrical resistivity, ρ, and the figure of merit, Z, of thermoelectric materials over the range of temperature 150–300 °K while maintaining the sample in an approximately isothermal enviro…
Abstract 1,8-Di-p-tolyl-3,6-diphenyl-1,4,7-octaaztriene (DTDPO) was prepared by the potassium permanganate oxidation of 1-p-tolyl-3-phenyl-1-tetraazene (TPT), and the kinetics and the products of the decomposition of DTDPO were investigated. The experimental results can best be explained by assuming a mechanism in whi…
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 W. E. Müller, "Note on Reflectance Measurements on Metals," Appl. Opt. 5, 876-877 (1966) Export Citation BibTex Endnote (RIS) HTML Plain Text Citation…
The physics of the polymerization of irradiated trioxane crystals have been studied experimentally and theoretically. A geometrical comparison of the monomer and polymer crystal lattices suggests that growth of the polymer twins must occur in a synchronized fashion. The crystal field in the polar trioxane lattice has…
Eight aluminium alloyswereexposedat marine sites at Kure Beach, North Carolina; Arenzano, Italy; and Bohus-Malmon, Sweden. Panels were removed at the end of 1-, 2- and 5-year exposure periods and evaluated for depth of pitting, corrosion rate and loss of mechanical properties. The high-purity aluminium and certain alu…
Abstract Various expressions are presented for the estimation of kinetic parameters during pyrolysis from DTA traces. These expressions are applied to polytetrafluoroethylene, polyethylene, polypropylene, polystyrene, isotactic poly(propylene oxide), and poly(methyl methacrylate). The results obtained are compared wit…
The conversion of trioxane crystals to crystalline high polymer is a cooperative process, analogous in certain aspects to diffusionless (‘martensitic’) transitions in metals and alloys. The reaction, which involves ionic states, is closely related to the electret character of crystalline trioxane. Evidence in support…
Tungsten single crystals were neutron irradiated to exposures of 0·46, 2·4, 4·0 and 7·3×1019 nvt (E> 1 Mev) and examined by transmission electron microscopy. Defect clusters, observed after 2·4×1019 nvt, increased in size and concentration with increasing neutron exposure. One specimen irradiated to 7·3×1019 nvt was s…
Reflectance of CoAl and NiAl alloys with CsCl structure was measured in the spectral region between 7000 and 3000 Å. Structures in the reflectance curves are discussed in terms of interband transitions. Rigid-band approximation seems to be able to explain various physical properties of these alloys.
The optical constants n and k have been calculated for fused silica, three silicate glasses, and a phosphate glass from reflectance measurements made in the strong absorption region, from about 7 micro to 13 micro. Plots of the 2nkv product, which corresponds to the conductivity, as a function of frequency are used to…