Model networks of end-linked polydimethylsiloxane chains. II. Viscoelastic losses
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Extended x-ray absorption fine structure (EXAFS) of supported platinum catalysts
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation J. H. Sinfelt, G. H. Via, F. W. Lytle; Extended x‐ray absorption fine structure (EXAFS) of suppor…
Vibrational normal modes of SiO2. II. Cristobalite and tridymite
The valence force field previously obtained on α and β polymorphs of quartz is applied to the other principal crystalline forms of SiO2. A correlation is found between certain vibrations belonging to different symmetry species. The calculated frequencies of cristobalite fit the whole experimental spectra with as much…
Surface structures of the two allotropic phases of cobalt
The atomic surface structures of the close-packed faces of single crystalline cobalt in the bulk hcp and bulk fcc phases have been determined by low-energy electron diffraction. The two separate structures were monitored on a single-crystal sample cycled through the surface-transformation temperature of 450 \ifmmode\p…
Dangling bonds on silicon
The electron-paramagnetic-resonance signal that appears when Si is crushed, cleaved, or abraded is shown to be proportional to the areas of microcracks induced in the specimen. These are shown to be more prevalent than previously realized. Detailed consideration shows that a wide variety of previously inexplicable dat…
Hopping conduction in semiconducting diamond
The electronic conductivity of synthetic boron-doped diamonds is studied in the temperature range 12-1300\ifmmode^\circ\else\textdegree\fi{}K. It is shown that in the low-temperature range (below 150-100\ifmmode^\circ\else\textdegree\fi{}K) the results are best interpreted in terms of variable-range hopping. An attemp…
X-ray photoelectron spectra, theoretical band structures, and densities of states for BaTiO3and KNbO3
X-ray photoelectron spectra of the valence bands and core levels for electron binding energies ranging from 0 to 45 eV, are presented for the two perovskite-type compounds BaTi${\mathrm{O}}_{3}$ and KNb${\mathrm{O}}_{3}$. Theoretical band structures and densities of states are calculated using a parametrized tight-bin…
Band structure and lattice instability of TiSe2
The energy band structure of Ti${\mathrm{Se}}_{2}$, determined in the local-density approach yields a semimetal (band overlap 0.20 \ifmmode\pm\else\textpm\fi{} 0.05 eV) with holes at $\ensuremath{\Gamma}$ and electron pockets only at $L$. The dimensions of the electron pocket indicate the presence of (7-8) \ifmmode\ti…
Theory for the first-order vibrational spectra of disordered solids
Expressions are derived in the harmonic approximation which relate the first-order Raman and infrared spectra of a disordered solid to a common set of vibrational densities of states. The calculations assume no periodicity, and using standard approximations lead to expressions involving explicitly defined matrix eleme…
Effects of interband excitations on Raman phonons in heavily dopedn−Si
Raman-active inter-conduction-band transitions from the ${\ensuremath{\Delta}}_{1}$ to ${\ensuremath{\Delta}}_{{2}^{\ensuremath{'}}}$ bands in heavily doped $n\ensuremath{-}\mathrm{Si}$ ($n\ensuremath{\simeq}1.5\ifmmode\times\else\texttimes\fi{}{10}^{20}$ ${\mathrm{cm}}^{\ensuremath{-}3}$) interfere with the zone-cent…
Intrinsic luminescence excitation spectrum and extended x-ray absorption fine structure above theKedge in CaF2
Excitation spectra of the 4.44-eV intrinsic luminescence in a single crystal of Ca${\mathrm{F}}_{2}$ at liquid-nitrogen temperature was measured using synchrotron radiation in the x-ray region. The intrinsic luminescence at 4.44 eV is due to self-trapped exciton recombination. The intensity of the emitted uv light was…
The constitutive equations of continuum creep damage mechanics
Abstract When metals are subjected to stress at temperatures in excess of about one third of their melting temperature, it is found that they deform continuously and that they can sustain the stress for a limited time referred to as the rupture life. Constitutive equations are proposed which describe the macroscopic b…
Electrical resistivity anomaly in β-MoTe2(metallic behaviour)
In-plane resistivity measurements, both parallel and perpendicular to the Mo chain direction have been performed on single crystals of beta -MoTe 2 between approximately 10K and 295K. The data suggest the existence of a first-order phase transition near 250K.
Determination of Charge or Polarization Distribution across Polymer Electrets by the Thermal Pulse Method and Fourier Analysis
Fourier analysis applied to the recently introduced thermal pulse method yields new and unique relations between the time-dependent pyroelectric response of a thin specimen and the Fourier coefficients of the charge or polarization distribution across its thickness. The new analysis is applied illustratively to therma…
Les Systemes Binaires Magnesium-Cuivre et Magnesium-Nickel en particulier Non-Stoechiomttrie des Phases de Laves MgCu2et MgNi2
Article Les Systemes Binaires Magnesium-Cuivre et Magnesium-Nickel en particulier Non-Stoechiomttrie des Phases de Laves MgCu2et MgNi2 was published on February 1, 1978 in the journal International Journal of Materials Research (volume 69, issue 2).
The production of glass fiber‐reinforced poly(butylene terephthalate) on a continuous kneader
Abstract In poly(butylene terephthalate) based compositions, thermal degradation of the polymer matrix during processing has to be minimized to achieve quality products. Experience has shown a temperature‐residence time relationship, indicating that for mixing systems with high product temperatures, the residence time…
Magnetic Anisotropy Induced by Magnetic and Stress Annealing in Co, Co–Ni and Co–Fe Alloys
The uniaxial magnetic anisotropy induced by magnetic annealing has been studied for Co, Co–Ni alloys with the γ\rightleftarrows ε and for Co–Fe, Fe–Ni alloys with the γ\rightleftarrowsα martensitic phase transition. An anomalously large uniaxial magnetic anisotropy was found in both pure Co and Co–Ni alloys, while a m…
Hyperfine fields of Fe impurities in the Heusler alloys Co2MnX (X=Ga, Ge, Si, Sn)
A Mossbauer effect study of 57 Co- and 57 Fe-doped Heusler alloys Co 2 MnX (X=Si, Ge, Sn, Ga), has shown that Fe preferentially replaces Mn in the crystal lattice. Variations in the isomer shifts follow trends observed in the system FeX. There is a substantial difference in the Fe magnetic hyperfine fields at the Co a…
Magnetoelastic surface waves on the (110) plane of highly magnetostrictive cubic crystals
Dispersion characterisitcs of magnetoelastic surface waves in highly magnetostrictive cubic crystals are calculated for different bias fields applied along the direction of propagation. Effects of anisotropy are taken into account. The surface waves are found to be leaky or nonleaky depending on the direction of propa…
Commensurate-Incommensurate Charge-Density Wave Phase Transition in One-Dimensional Electron-Phonon System. II
The Commensurate-Incommensurate (C-IC) phase transition at finite temperature is considered in mean-field approximation taking account of higher harmonics. The phase diagram is given in the (µ, T)-plane, where µ represents a measure of the deviation from 1/3 filledness. It is shown that at proper values of µ successiv…