Materials Literature
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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…
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…
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 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…
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…
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…
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…
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…
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…
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.
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…
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).
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…
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…
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…
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…
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…
Abstract A weakly nonlocal version of the nonlocal continuum theory is used to calculate the interaction energy between a pair of identical defects in a face‐centred cubic lattice when the defect spacing is large. The lattice is assumed to be the same that was considered by Hardy and Bullough, namely, an idealized har…
A dielectric-relaxation model has been proposed by Simmons and Taylor to explain anomalous currents in silicon nitride thin films. In this study, similar currents are observed in certain cadmium borosilicate glasses. The presence of a color center and of composition indepedence of the activation energy for electronic…
The magnetic structure of Fe 5 SiB 2 has been investigated using Mössbauer spectroscopy. In the temperature region 140 K-784 K the compound is found to be a simple ferromagnet with the spins parallel to the c -axis. At lower temperatures the spins are located in or close to the ab -plane and there are indications that…