Materials Literature
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A model of two-dimensional hydrogen-bonded crystals satisfying the ice rule is presented and solved exactly in the presence of an external electric field. The transfer-matrix method is used. The model includes, for special values of the parameters, the ice problem, the Rys $F$ model of an antiferroelectric, and the Sl…
The Slater KDP model is solved for all temperatures and with an electric field. Above ${T}_{c}$ the specific heat behaves like ${(T\ensuremath{-}{T}_{c})}^{\ensuremath{-}\frac{1}{2}}$ and the polarizability like ${(T\ensuremath{-}{T}_{c})}^{\ensuremath{-}1}$. There is a first-order phase transition at ${T}_{c}$ (laten…
The crystal structures at 298°K of MnBr2·2H2O and CoBr2·2H2O have been refined by full-matrix least-squares methods using three-dimensional MoKα intensity data. In these compounds, polymeric chains of metal and bromine atoms arranged in a near-square planar arrangement with each bromine atom shared by two metal atoms…
The Mössbauer absorption spectrum of 57Fe in single crystals of Na2[Fe(II)(CN)5NO]·2H2O has been studied. The angular variation of the ratio of intensities of the quadrupole-splitted lines with the incident radiation has been measured at different crystal orientations. The results may be satisfactorily interpreted by…
Phonon resonances have been observed in both KCl:Li and KBr:Li through measurements of the low-temperature thermal conductivity between 0.05 and 100\ifmmode^\circ\else\textdegree\fi{}K. Their frequencies are 1.2 and 63 ${\mathrm{cm}}^{\ensuremath{-}1}$ in KCl, and 3.2 and 39 ${\mathrm{cm}}^{\ensuremath{-}1}$ in KBr. S…
The rate of vibrational deactivation by collision of polyatomic molecules is discussed. Previous calculations for CO2 by the author are corrected. A systematic method to find the steric factor in complex collisions is proposed, and the best procedure for evaluation of such collisions is discussed. Mixture of vibration…
Well-resolved high-resolution proton nuclear resonance spectra have been observed for solutions of Co(II) poly(1-pyrazolyl) borate chelate systems in CDCl3. In a previous paper [J. P. Jesson, J. Chem. Phys. 45, 1049 (1966)], optical and paramagnetic resonance data have been described for some of these compounds. The c…
Phase relations among Cs II, Cs III, Cs IV, and liquid have been determined by resistance and differential-thermal-analysis techniques. The triple-point coordinates among Cs II-III-liquid and Cs III-IV-liquid are (42.5 kbar, 88\ifmmode^\circ\else\textdegree\fi{}C) and (43.9 kbar, 98\ifmmode^\circ\else\textdegree\fi{}C…
Self-quenching of Nd emission from Nd4F3/2 in the Na0.5(Y, Nd)0.5WO4 tungstates (scheelite structure) and transfer from Nd4F3/2 to Tb or Eu involves dipole—dipole interactions. Self-quenching of Nd is largely by thermally activated interactions at 295°K. However, processes requiring the simultaneous transfer of ∼600 c…
The intrinsic switching path for the electric field enforced transition from antiferroelectric to ferroelectric states has been computed for the simple Kittel linear antiferroelectric. The generalized switching curves give values of the polarization, free energy, and dielectric susceptibility as a function of applied…
A detailed study has been made of the EPR spectra of trapped hole centers formed by x irradiation in alkali silicate glasses. The spectra of the five alkali silicate glasses were studied as a function of composition, microwave power, and bleaching temperature. It was found that the spectra could be decomposed into two…
The energy-dependent rate for inelastic scattering of electrons by production of electron-hole pairs is computed by first-order perturbation theory for silicon using a screened Coulomb interaction with a frequency- and momentum-dependent dielectric function calculated for silicon in the random-phase approximation. The…
The fluorescence of Y3Al5O12–Ce3+ under cathode-ray excitation consists of an emission band peaking at 550 nm. The decay time is 0.07–0.08 μsec. In view of these properties this phosphor is very suitable for flying-spot cathoderay tubes for color television.
Abstract In the preceding paper Frank & Lawn (1967) investigated theoretically the development of a cone crack in the strongly inhomogeneous Hertzian stress field. The analysis outlined in that paper is now extended to incorporate a sliding motion of the spherical indenter across the specimen surface, assuming a u…
Abstract The fracture of a brittle solid under a spherical indenter is the best studied case of fracture in a strongly inhomogeneous, well defined, stress field. Two principal topics are discussed, the path of a crack in a field of non-uniformly directed stress, and the stability of cracks of various length when the p…
The paramagnetic resonance at $\ensuremath{\nu}=9.3$ Gc/sec has been observed at helium temperatures for ${\mathrm{Ce}}^{3+}$, ${\mathrm{Nd}}^{3+}$, ${\mathrm{Dy}}^{3+}$, ${\mathrm{Er}}^{3+}$, and ${\mathrm{Yb}}^{3+}$ diluted in single crystals of Y${\mathrm{Cl}}_{3}$\ifmmode\cdot\else\textperiodcentered\fi{}6${\mathr…
It is pointed out that the classical two-dimensional harmonic "solid" exhibits an infinite generalized susceptibility at low temperature, although there is no long-range order and no phase transition.Received 15 May 1967DOI:https://doi.org/10.1103/PhysRevLett.19.20©1967 American Physical Society
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 Jon Geist, Gerhart J. Kneissl, and V. R. Weidner, "High Purity Powdered CsI as a High Reflectance Infrared Diffuser," Appl. Opt. 6, 1280-1281 (1967) Ex…
Potentiostatic anodic polarisation measurements on brasses (100–60 wt.-% Cu) in 0 ·150 N-NaOH are described and compared with those of the pure components. The inapplicability of current theories on anodic dissolution of homogeneous binary systems is discussed, and a possible mechanism for anodic dissolution is sugges…
Pelletized samples of ZnSO4 and ZnO·2ZnSO4 were decomposed in a stream of N on a recording thermogravimetric balance. Both decomposition reactions are typically topochemical and they follow linear kinetics. The effect of partial pressures of SO3 on the rate of decomposition of ZnO—2ZnSO4suggests that SO3 is strongly a…