Materials Literature
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Optical reflection and transmission measurements have been made between 6 eV and 13 eV on specimens of natural muscovite, phlogopite, biotite and a synthetic fluorphlogopite. Reflectivity peaks are observed near 9.9 eV and 11.8 eV and are thought to be due to the silicate structure of mica. An absorption edge occurs n…
The polarized (${I}_{\ensuremath{\parallel}}$) and depolarized (${I}_{\ensuremath{\perp}}$) scattered light intensity by fluctuations of the order parameter $Q$ near the isotropic-nematic phase transition of para-methoxybenzylidene para-$n$-butylaniline has been measured as a function of the scattering angle over a ra…
The valence-band structures of MnO, CoO, NiO, ${\mathrm{Cu}}_{2}$O, CuO, and Re${\mathrm{O}}_{3}$ have been obtained by x-ray photoemission spectroscopy. It is found that in every case a narrow metal $d$ band lies above the center of the oxygen $2p$ valence band.
A conventional absolute method was used for the measurement of the thermal conductivity of pressed and sintered p-type Bi2Te3–Sb2Te3–Sb2Se3 alloys and n-type Bi2Te3–Bi2Se3 alloys in the temperature range of 300 to 600 K. The measurements were made in directions parallel and perpendicular to the pressing direction. Mea…
The theoretical distribution, with exact second moment, of the number of photoelectrons emitted by an extended photodetector illuminated with partially coherent light is first derived. Then the parameter N, the number of degrees of freedom, is obtained from the second moment of the distribution, for [Formula: see text…
An experimental study of the constitution of the As–Te glasses has been carried out, using glass-forming-ability measurements, high-angle diffraction, differential thermal analysis, and other thermodynamic determinations. Evidence is definitely given for a difference of valency between crystalline and glassy states. A…
After a brief review of the principal features associated with energy-band diagrams of ideal transition-metal monoxides having localized vs itinerant $d$ electrons, modification of these diagrams is discussed for real crystals in the systems $\mathrm{Ti}{\mathrm{O}}_{x}$ and $\mathrm{V}{\mathrm{O}}_{x}$, which have it…
The interaction between strain and order parameter at the structural transition in SrTi${\mathrm{O}}_{3}$ is investigated by ultrasonic measurements of attenuation, velocity shifts, and stress dependence of the transition temperature ${T}_{a}$. A method is described by which measurements of domain attenuation are used…
The rate of multiphonon relaxation of rare-earth ions in crystals has been calculated using the Kubo representation of the rate constant in terms of linear response time correlation functions. The nonadiabatic electron-phonon operator arising from the effect of the kinetic energy of the ions on the Born-Oppenheimer ba…
Magnetic susceptibility measurements have been made between 1.5 and 20°K on [(C2H5)4N]2CoCl4. The results show that the CoCl4 2− tetrahedra are oriented such that their unique axes lie in or near the (001) plane while maintaining the tetragonal symmetry exhibited by the crystal at room temperature. Values for the para…
The reflectivity of a thick sputtered film of V${\mathrm{O}}_{2}$ has been measured in the energy range 0.5-11.0 eV at room temperature. The complex dielectric constant (${\ensuremath{\epsilon}}_{1},{\ensuremath{\epsilon}}_{2}$) and the complex index of refraction ($n,k$) have been obtained from the reflectivity measu…
The local-empirical-pseudopotential method is used to calculate the electronic band structure of Sn${\mathrm{S}}_{2}$ and Sn${\mathrm{Se}}_{2}$. The pseudopotential form factors for the constituent elements Sn, S, and Se are determined from previous pseudopotential calculations for other crystals. Slight adjustments w…
The cubic compounds $\mathrm{Ti}{\mathrm{O}}_{x}$ and $\mathrm{V}{\mathrm{O}}_{x}$ have a broad homogeneity range with $x$ varying from about 0.75 to 1.30 and a total vacancy content varying between 11 and 20%. Golden $\mathrm{Ti}{\mathrm{O}}_{x}$ is a typical metal with a temperature- and composition-independent resi…
Optical absorption measurements near the absorption edge are presented for three bulk semiconductor glasses: ${\mathrm{As}}_{2}$${\mathrm{S}}_{3}$, ${\mathrm{Ge}}_{33}$${\mathrm{As}}_{12}$${\mathrm{Se}}_{55}$, and ${\mathrm{Ge}}_{28}$${\mathrm{Sb}}_{12}$${\mathrm{Se}}_{60}$. The weak absorption tails observed below th…
For pt. I see ibid., vol. 5, 738 (1972). The band structures of some group IVA dichalcogenides-ZrS 2 , ZrSe 2 , HfS 2 , HfSe 2 -are calculated using a semiempirical tight binding method. A symmetry analysis of the crystal structure is given together with the selection rules for optical transitions. The experimental pr…
For pt. II see ibid., vol. 5, 746 (1972). The semiempirical tight binding method is applied to the calculation of the electronic band structures of MoS 2 , MoSe 2 , alpha -MoTe 2 , WS 2 and WSe 2 in a two dimensional approximation. After a review of the structure and the physical properties of these compounds, the sym…
Rayleigh light scattering was observed with photon-counting techniques in the isotropic phase of cholesteryl 2-(2-ethoxyethoxy) ethyl carbonate just above the transition temperature to a cholesteric liquid crystal. Both the temperature and wave-vector dependences of linewidth and intensity were measured. The data are…
Abstract Experimental heat capacity data for the alcaline-earth-oxides have been used to analyse by a new method the high temperature thermodynamic properties of these crystals in terms of quasi-harmonic and explicit anharmonic contributions. The explicit anharmonic contribution ΔC is consistent with theoretical predi…
Koichi Niihara, Toetsu Shishido, Seishi Yajima; The Nonstoichiometry of Gadolinium Ditelluride, Bulletin of the Chemical Society of Japan, Volume 45, Issue
A method is outlined to study the structure property relationship in semicrystalline fibers involving (a) the characterization of structure in terms of the two phase amorphous-crystalline model (size, concentration and orientation of the crystallites, etc.), (b) the analysis of viscoelastic responses in terms of Takay…