Materials Literature
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The structure of the high-temperature, plastic form of lithium sulphate has been determined from neutron powder diffraction data collected at 908K. The structure is face-centred cubic, a=7.07 AA with the SO 4 2- ion situated at the origin and the oxygen atoms rotationally disordered about the sulphur atom. The Li + io…
Abstract Kinetics of the catalyzed decomposition of hydrogen peroxide in the presence of BF 3 etherate were investigated, and the basic kinetic parameters used in the discussion of the mechanism of this reaction were determined. The system hydrogen peroxide‐BF 3 etherate was used in the initiation of the radical polym…
X-ray luminescence spectra of single crystals of composition 0.9 ZrO2-0.1 Y2O3 and 0.9 ZrO2-0.09 Y2O3-0.01 Ln2O3 (Ln = Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, Yb) are obtained at room temperature. A wide structureless band of luminescence with a maximum at about 500 nm is found. Thermostimulated luminescence is investigat…
The 17O NMR relaxation times, T1 and T2, for water in aqueous solutions of Gd(ClO4)3 and GdPDTA− and the EPR linewidths for the same complexes have been measured. These data are analyzed in terms of the Solomon-Bloembergen-Morgan equations for relaxation of a nucleus near a paramagnetic ion and McLachlan’s theory for…
A new transfer-matrix method is developed for low-energy-electron diffraction and other interface electronic-structure problems. This new procedure uses the waves incident on each layer as the basis for the transfer matrix. These waves are not singular at the plane of atoms, so that transfer can be done from one atom…
Measurements of the nonlinear conductivity in Nb${\mathrm{Se}}_{3}$ resulting from the high-temperature charge-density wave (CDW) have been made. The results show that the electronic properties of Nb${\mathrm{Se}}_{3}$ in the temperature regime where only one CDW exists are qualitatively the same as those in the the r…
The ion-ion correlations and a new crystal-structure determination of ${\ensuremath{\beta}}_{\mathrm{Na}}^{\ensuremath{'}\ensuremath{'}}$- and ${\ensuremath{\beta}}_{\mathrm{K}}^{\ensuremath{'}\ensuremath{'}}$-alumina reveal that the conducting ions are distributed between two independent sites instead of one given by…
The x-ray photoelectron intensity of the $1s$ core level of adsorbed oxygen in the form of a $c(2\ifmmode\times\else\texttimes\fi{}2)$ overlayer on Cu (001) exhibits strong angular dependence due to final-state diffraction at low electron take-off angles. The azimuthal anisotropies of the intensity, measured as $\frac…
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 G. A. Massey, T. M. Loehr, L. J. Willis, and J. C. Johnson, "Raman and electrooptic properties of potassium titanate phosphate," Appl. Opt. 19, 4136-41…
A new empirical method for the analysis of solid solubility in alloys is proposed. The method is an extension of previous work by Darken and Gurry and by Chelikowsky. Each chemical element is characterized by three parameters: the atomic volume $V$, the electronegativity ${\ensuremath{\varphi}}^{*}$, and the electron…
Optical constants (absorption coefficient and refractive index) of unstrained GaSe samples at low temperature have been measured in the vicinity of the band-edge and exciton series. A quantitative fit with Elliott's model is given for the position and intensity of the levels. This does not necessitate any variation of…
The lattice theory of hard rods with anisotropic dispersion forces presented recently is extended to the case where the rods are dispersed in a diluent. Two systems are treated: (i) rods of axial ratio x diluted with solvent molecules having x=1, and (ii) rods of axial ratio xα mixed with homologs of axial ratio xβ. T…
A detailed study of the optical absorption and luminescence spectra associated with the precipitated phases of divalent europium in NaCl and KCl single crystals is reported. For the system NaCl-Eu${\mathrm{Cl}}_{2}$, three fluorescence bands peaking at 410, 439, and 485 nm were observed in crystals which were stored f…
The mechanical characteristics of triboluminescence (TL) from coumarin, acenaphthene, resorcinol, phenanthrene, and m-aminophenol crystals are studied. The TL spectra of these crystals resemble their fluorescence spectra. The TL appears concurrently with the sudden force decreases in the fracture regions of the force…
The systematics of the electronic structure of $\mathrm{La}B{\mathrm{O}}_{3}$ perovskite oxides, where the $B$ element scans the $3d$ transition-metal series from Ti to Co, are examined. X-ray photoelectron spectra of valence bands and shallow core states are presented and compared with theoretical molecular cluster a…
The surface-enhanced Raman spectrum of benzene and benzene-d6 adsorbed on a silver film vapor-deposited onto a low-temperature substrate is reported. Many lines which correlate with Raman-inactive and even infrared and Raman-silent modes of the free molecule are observed with high intensity in the spectrum. The local…
Intrinsic point defects were produced on ZnO ($10\overline{1}0$) surfaces by thermal treatment, uv illumination, and CO exposure. Electronic structure and thermodynamics of surface defects as well as their influence on charge-transfer reactions are discussed.
The temperature dependence of the radius of gyration of polystyrene (MW=2.6×107) in cyclohexane in the good through poor solvent regimes was obtained by analysis of the angular dependence of the autocorrelation function of light scattered from the solution. The observed transition in polymer dimensions through the coi…
Calculations of the pair-creation energy $\ensuremath{\epsilon}$, the Fano factor $F$, and the quantum yield for semiconductors are done for the assumptions that in each scattering event all possible sets of product particles are equally probable, that the energy bands are those of free particles separated by a band g…
A model for Raman scattering by a molecule adsorbed at the surface of a spherical particle is articulated by treating the molecule as a classical electric dipole. This follows Moskovits’s suggestion [ J. Chem. Phys.69, 4159 ( 1978)] and the experiments by Creighton [ J. Chem. Soc. Faraday Trans. II, 75, 790 ( 1979)] t…