Materials Literature
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Light induced changes of absorption in semiconductor-doped glasses are studied on the femtosecond and picosecond time scale. Extremely rapid absorption recovery times of 200 fs are found when carriers are excited with large excess energy (500 meV) above the absorption edge of the semiconductor-doped glasses. Excitatio…
Phonon dispersion curves for the [110] 〈1\ifmmode\bar\else\textasciimacron\fi{}10〉 ${\mathrm{TA}}_{2}$ branch in ${\mathrm{Ni}}_{\mathrm{x}}$${\mathrm{Al}}_{100\mathrm{\ensuremath{-}}\mathrm{x}}$ (50<x<65) reveal a pronounced minimum whose position in q space is composition dependent but whose frequency does not…
Elastic and inelastic neutron scattering experiments have been carried out to investigate magnetic structure and magnetic excitations in anisotropic antiferromagnet FeTiO 3 . A detailed structure analysis shows that the spin direction of each Fe 2+ ion is oblique away from the hexagonal c axis by (2.2+or-0.2) degrees…
The electrical properties of thin polycrystalline films of p-type CuInSe2 grown from stoichiometric and from copper excess charges are studied in the temperature range 77 to 300 K. It is found that the effect of excess copper is to short the grain boundaries (up to 2% excess copper) thereby improving the conductivity…
We present a new analysis of a series of measurements of the static and time-dependent interactions in the angular correlation of \ensuremath{\gamma} rays from $^{111}\mathrm{Cd}$ following electron capture in $^{111}\mathrm{In}$, in ${\mathrm{InCl}}_{3}$, ${\mathrm{InCl}}_{2}$, ${\mathrm{InCl}}_{1.8}$, ${\mathrm{InCl…
This letter discusses the synthesis of CoNx films using rf diode reactive sputtering. It describes the properties of crystal structures in CoNx thin films and in particular, the post-annealing effects on the crystal structures of CoNx. The CoNx films have the crystal structures of ε-Co(hcp), α-Co(fcc), α′-Co(fcc) as a…
Cristallisation dans le systeme quadratique, groupe P4 1 et affinement jusqu'a R=0,048. La structure est constituee d'anions TeO 3 2− legerement deformes relies par des cations Pb 2+
The long-term photocurrent decays following the steady-state photoexcitation have been reported in amorphous ${\mathrm{As}}_{2}$${\mathrm{Se}}_{3}$, ${\mathrm{As}}_{2}$${\mathrm{S}}_{3}$, GeSe, ${\mathrm{GeSe}}_{2}$, and ${\mathrm{GeS}}_{2}$ films. The photocurrent decays empirically as exp(-${\mathrm{Ct}}^{\ensuremat…
The empirical linear combination of atomic orbitals approach toward calculating band structures is extended to include third-nearest neighbors, and used to calculate both the conduction and valence bands of a wide range of semiconducting materials. Using these bands, we calculate the dispersion of the dielectric const…
Optical second harmonic generation has been used to study the polymerization of a monolayer of vinyl stearate or octadecyl methacrylate spread at the air/water interface. Rapid polymerization occurred when monolayers were irradiated with ultraviolet light, while some slower polymerization occurred when certain redox i…
The static structure factor and pair distribution function of high-density amorphous ${\mathrm{D}}_{2}$O ice, which is made by apparently melting ice I at 10.5 kbar and 77 K, have been determined by neutron diffraction at 17 K and zero pressure. The pair distribution function, scaled to 10 kbar, is compared with the s…
Galvanic pairs of varying area ratios have been exposed to seawater on the Swedish west coast for one year. In most couples the cathodic member has been the highly alloyed stainless steel 254 SMO and the anodic member one of several copper alloys. Muntz metal was rapidly attacked by dezincification at all area ratios,…
The spin dynamics in a quasi-two dimensional antiferromagnet MnTiO 3 has been studied in the temperature range between 7 K and 300 K by means of inelastic neutron scattering with the multi-analyser crystal spectrometer (MAX). The exchange interaction parameters were determined from the spin-wave dispersion relations a…
Hyper-Raman scattering of cubic zirconia and ${\mathrm{CaF}}_{2}$ is measured at room temperature. For a ${\mathrm{CaF}}_{2}$ crystal, the frequencies of the TO and LO modes with ${T}_{1u}$ symmetry are determined to be 260 and 480 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$, which are in good accord with the results o…
Using an evanescent-wave ellipsometric technique, we have studied the wall-induced orientational order in the isotropic phase of ${4}^{\ensuremath{'}}\ensuremath{-}n\ensuremath{-}\mathrm{pentyl}\ensuremath{-}4\ensuremath{-}\mathrm{cyanobiphenyl}$ (5CB) at a silane-treated glass surface. Near the isotropic-nematic tran…
A study was made of the volume expansion obtained during ion implantation of 170-keV fluorine ions into diamond under ambient temperature. By concluding that the expansion is not related to the onset of amorphization or graphitization of the ion-damaged layer, a simple theoretical description of the phenomenon could b…
The thermal properties of (KBr${)}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$(KCN${)}_{\mathrm{x}}$ single crystals have been studied between 0.05 and 100 K over the entire compositional range. For 0.25\ensuremath{\le}x\ensuremath{\le}0.70, these crystals have the thermal conductivity that is typical for all structurally d…
Rietveld analyses of room-temperature neutron diffraction data for seven Nd2(CoxFe1−x)14B alloys (x=0, 0.1, 0.3, 0.5, 0.7, 0.9, 1) are reported. Throughout the entire composition range the Nd2Fe14B-type tetragonal crystal structure is maintained, with the lattice constants decreasing significantly as the Co concentrat…
We present an integrodifferential-operator formulation of the problem of linear stability around the selected needle crystal pattern in dendritic crystal growth. We show by explicit computation that (a) all members of the discrete set of allowed steady states aside from the fastest are unstable and (b) the fastest suc…
High-resolution measurements of the ir stretching bands of OH and OD at about 3500 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ and 2600 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ in monodomain ${\mathrm{SrTiO}}_{3}$ crystals yield spectroscopic data for a local anharmonic-oscillator model. The optical polarization depe…