Materials Literature
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Expressions for the equation of state and the chemical potential are derived as functions of density and temperature for both a perfectly aligned and a completely isotropic fluid of rigid spherocylinders through consideration of the reversible work W(α, λ, ρ) necessary to add a scaled spherocylinder of radius α and cy…
The Auger-electron spectra in the intermediate- and low-energy range (0-1 keV) for many of the transition metals of periods 4-6 (specifically, Sc, Ti, V, Cr, Fe, Co, Y, Zr, Nb, Mo, Ru, Rh, La, Hf, Ta, W, Re, Ir, Pt, and Au) have been measured. In general, the spectra from elements in the same period of the Periodic Ta…
The infrared lattice-vibration spectra of ${\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Al}}_{x}\mathrm{As}$ mixed crystals have been studied by measuring the room-temperature reflectivity at near-normal incidence in the 200-600-${\mathrm{cm}}^{\ensuremath{-}1}$ frequency range. Two distinct reststrahlen bands with freque…
The small-signal permittivity of the (100)-type 180° domain wall in BaTiO 3 is calculated relative to the signal-domain permittivity according to a previously-reported microscopic model of 180° domain walls in BaTiO 3 . A perturbation approach is developed which makes use of the known zero-field solutions of this doma…
The free radicals •Mn(CO) 5 and •Co(CO) 4 have been produced by the pyrolysis of Mn 2 (CO) 10 and Co 2 (CO) 8 in graphite flow reactors. The effusing molecular beams from these reactors were analyzed mass spectrometrically. Evidence is presented for the following equilibria[Formula: see text]From the temperature depen…
Single crystals of ferroelectric AgNa(NO 2 ) 2 were grown from aqueous solution containing proper amounts of NaNO 2 and AgNO 2 , and dielectric properties were measured. The dielectric constant along the b -direction ε b at 1 kHz shows a sharp maximum at the Curie point of 38°C. Above the Curie point, ε b obeys the Cu…
The interaction of Frankel excitons with optical phonons in molecular crystals is studied by means of a Green's function method in which the use of a canonical transformation allows most of the exciton–phonon interaction to be treated nonperturbatively. The self-energy of the Green's function is then expanded in terms…
ANDRES, K. (1968). Phys. Rev. 170, 614. BARRETT, C. S., MUELLER, M. H. & HITTERMAN, R. L. (1963). Phys. Rev. 129, 625. COPPENS, P. & HAMILTON, W. C. (1968). American Crystallographic Association Meeting, Buffalo, New York. Abstract G2. FISHER, E. S. & DEVER, D. (1968). Phys. Rev. 170, 607. HEATON, L., MUELLER, M. H. &…
Mössbauer spectra of 57 Fe in the nickel–zinc ferrite system (ZnO) x (NiO) 1−x Fe 2 O 3 have been obtained, at room temperature and at 77 °K, in zero magnetic field and also in a longitudinal magnetic field of 13.5 kG, covering the full range of zinc content. The dependence of the isomer shifts, line widths, quadrupol…
A complete theoretical and experimental analysis of the Maker fringes leads to the determination of accurate relative nonlinear optical susceptibilities in Si${\mathrm{O}}_{2}$, ${\mathrm{NH}}_{4}$${\mathrm{H}}_{2}$P${\mathrm{O}}_{4}$, and K${\mathrm{H}}_{2}$P${\mathrm{O}}_{4}$: ${{d}_{11}}^{2\ensuremath{\omega}}(\mat…
The electrical resistivities of single crystals of Ru${\mathrm{O}}_{2}$ and Ir${\mathrm{O}}_{2}$ in the temperature range 10-1000\ifmmode^\circ\else\textdegree\fi{}K are reported. It is found that electron-phonon and electron-electron interband scattering mechanisms account quantitatively for the observed temperature…
The first- and second-order Raman spectra of diamond were studied using the 4880 \AA{} and 5145 \AA{} lines of an Ar ion laser and the 6328 \AA{} line of a He-Ne laser. The spectra were recorded at room, liquid-nitrogen, and liquid-helium temperatures. In addition to the second-order spectrum previously reported by Kr…
In this paper, the total resistivity of a thin metal film is calculated from a model in which three types of electron scattering mechanisms are simultaneously operative: an isotropic background scattering (due to the combined effects of phonons and point defects), scattering due to a distribution of planar potentials…
Abstract Further examination of the active site region in our X-ray crystallographic model of subtilisin BPN' reveals a hydrogen-bond network that bears a remarkable resemblance to the one found in a- chymotrypsin. It involves the side chains of the reactive Ser-221, His-64, Asp-32 and Ser-33. Otherwise the two enzyme…
It is proposed that the temperature of mesomorphic-isotropic phase changes and of transitions between mesophases may be markedly shifted by manageable electric fields. First experiments demonstrating such a shift in the nematic-isotropic transition of $p$-ethoxybenzylidene-${p}^{\ensuremath{'}}$-aminobenzonitrile are…
A new electric-field-induced color range, in which colors change from blue to red with increasing field, has been observed in cholesteric liquid crystals. Observations of this new color range quantitatively confirm the theories of Meyer and de Gennes and enable identification of the specific nature of the electric-fie…
Zinc phosphate coatings are composed of a maze of crystals on steel surfaces and act as absorptive media for organic materials. These coatings find extensive use in the automotive, appliance, and building trade industries. A brief review is given of the processes occurring during the formation and growth of the crysta…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantitation in Elemental AnalysisH. KaiserCite this: Anal. Chem. 1970, 42, 2, 26A–59APublication Date (Print):February 1, 1970Publication History Published online23 May 2012Published inissue 1 February 1970https://pubs.acs.org/doi/10.1021/ac60286a722https://doi.org/10.1021/…
The thermal diffusivity k d of silicon between - 50°C and 100°C has been obtained by measuring the phase-shift of a thermal wave between two points on a small sample. The relation between the thermal diffusivity and phase-shift is obtained by solving the heat flow equations. The present results agree closely with thos…
A method of computing the electrostatic potential and electron trajectories in electron guns of the electron microscope type is described. Potentials are computed digitally using the successive over-relaxation technique, using two different mesh sizes. Electron trajectories are computed by a predictor-corrector method…