Materials Literature
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A new model of the hydrogen bond network in liquid water is developed. Using the technique of polymer science, the grand canonical partition function of water is expressed by the functional integral of the field variables. The method is applied to anomalies of liquid water. Using the mean-field lattice-gas approximati…
Li 3 B 7 O 12 cristallise dans P1 avec a=6,487, b=7,840, c=8,510 A, α=92,11, β=104,85, γ=99,47 o , Z=2; affinement jusqu'a R=0,061. La structure contient un reseau de mailles unitaires B 3 O 7 , B 3 O 8 et BO 3 avec des cations Li + situes dans les interstices
The empirical response function introduced by Cole and Davidson for the analysis of dielectric relaxation in the frequency domain has been used in an analogous way to reanalyze ionic conductivity relaxation using the electric modulus representation. The fitting of data for ionic relaxation in AgPO3, 0.1AgI-0.9AgPO3, a…
Electronic contributions to the optical properties of small silicon clusters are examined. Geometries and the electronic structures of the clusters are established using the tight-binding model, and linear as well as nonlinear polarizabilities of the clusters are evaluated using one-electron density matrix techniques.…
Transmission spectra of alkali borate glass films of known thickness have been studied as a function of film thickness in the frequency range 50–2000 cm−1, and the composition range 0–70 mol % Na2O. The apparent absorption coefficient of the Na+ ‘‘rattling’’ mode at ≊200 cm−1 becomes almost independent of film thickne…
Oxide layers grown on surfaces of gas-evaporated Si particles as small as 100 Å have been investigated. Results of high-resolution electron microscopy and x-ray photoemission spectroscopy show that the native oxide layer (SiOx) is about 20 Å thick and its chemical composition x is around 1.2. When the particles are an…
Hole mobilities have been measured in tri-p-tolylamine-doped polymers as functions of the polymer composition, temperature, and electric field. Depending on the composition of the polymer, the mobilities vary by over two orders of magnitude. In all cases, the electric field and temperature dependencies can be describe…
The two-dimensional decagonal quasicrystal has been found in many Al-M (M=transitional metal) alloys, very often coexisting with a large-unit-cell phase of similar composition and local structure. By introducing phasons in two orthogonal directions in the quasiperiodic plane perpendicular to the periodic tenfold axis,…
The temperature ( T ) dependence of lattice parameters and the pressure effect on the charge-density wave (CDW) transition temperature T t for V 3 Te 4 with NiAs-like crystal structure are reported. The thermal expansions of lattice parameters a ( T ) and b ( T ) below T t deviate upwards from their linear variation a…
Cristallisation dans P3 - m1 avec a=5,8580, c=7,523 A, Z=1; affinement jusqu'a R=0,030. Une decroissance dans la raideur elastique de la composante C 44 du tenseur pres de 239 K revele une transition de phase a cette temperature. La configuration de la structure de cette zone confirme le caractere ferroelastique de la…
The band structure of cubic ${\mathrm{CsSnBr}}_{3}$ is determined by an empirical pseudopotential method. Independent of the choice of the parameters used in the calculation, cubic ${\mathrm{CsSnBr}}_{3}$ is shown to be a zero-band-gap semiconductor. Based on this result, a new interpretation of the experimental data…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCompositional Mapping with the Electron Probe Microanalyzer: Part IDale E. Newbury, Charles E. Fiori, Ryna B. Marinenko, Robert L. Myklebust, Carol R. Swyt, and David S. BrightCite this: Anal. Chem. 1990, 62, 22, 1159A–1166APublication Date (Print):November 15, 1990Publicati…
We present Raman data for the OD stretch mode of 10 mol % HOD in H2O for the liquid phase from −31.5 to 160 °C. We find that an exact isosbestic does not hold, but rather the crossing of isotherms slowly but uniformly changes with temperature. We present an analysis based on Boltzmann statistics which gives evidence f…
The polarization reversal in one-dimensional systems representing ferroelectrics has been studied on the basis of a proposed discrete lattice model. Latent nuclei are assumed to exist, and their influence on the polarization appearing in equilibrium states is discussed. Simulations of polarization reversal have been p…
The adiabatic potential surface for triplet exciton self-trapping and Frenkel-defect pair creation in ${\mathrm{SiO}}_{2}$ has been studied with use of a periodic supercell model and a self-consistent intermediate neglect of the differential overlap method for open shell. The results obtained confirm completely the se…
Thermal conductivities of InSb and GaSb in solid and liquid states were measured with a ceramic probe. Thermal conductivities at melting points were about 17.7 (W/mK) at 803 K for molten InSb and 21.7 (W/mK) at 993 K for molten GaSb. Thermal conductivities were slightly increased with increasing temperature in liquid…
RuS 2 cristallise dans Pa3 - avec a=5,6106 A, Z=4; affinement jusqu'a R=0.021. RuSe 2 cristallise dans Pa3 - avec a=5,9336 A, Z=4; affinement jusqu'a R=0,021. Les distances intermoleculaires des agregats S 2 et Se 2 sont beaucoup plus petites que les sommes des rayons de Van der Waals correspondantes. La longueur de l…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFiber-optic remote sensor for in situ surface-enhanced Raman scattering analysisJob M. Bello, V. Anantha. Narayanan, David L. Stokes, and . Vo Dinh TuanCite this: Anal. Chem. 1990, 62, 22, 2437–2441Publication Date (Print):November 15, 1990Publication History Published onlin…
The change in the chemical surface state of polished Si wafers [p-type, (100) oriented] during storage in air at room temperature was investigated for storage times up to half a year. Measurements were performed by x-ray Photoelectron Spectroscopy (XPS) and High Resolution Electron Energy Loss Spectroscopy (HREELS). I…
Structural models needed in calculations of properties of substitutionally random ${\mathit{A}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathit{B}}_{\mathit{x}}$ alloys are usually constructed by randomly occupying each of the N sites of a periodic cell by A or B. We show that it is possible to design ``special quasira…