Materials Literature
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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…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStoichiometry and kinetics of the thermal decomposition of molten anhydrous lithium nitriteA. K. K. Lee and E. F. JohnsonCite this: Inorg. Chem. 1972, 11, 4, 782–787Publication Date (Print):April 1, 1972Publication History Published online1 May 2002Published inissue 1 April…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDeformation mechanisms of polyethyleneRichard S. SteinCite this: Acc. Chem. Res. 1972, 5, 4, 121–127Publication Date (Print):April 1, 1972Publication History Published online1 May 2002Published inissue 1 April 1972https://pubs.acs.org/doi/10.1021/ar50052a001https://doi.org/1…
Abstract Alteration products of volcanic materials from various localities in Wyoming, U.S.A., Italy, Yugoslavia and Mozambique are mainly smectites and cristobalites with small amounts of kaolinite. Smectite and cristobalite form separate and intergrown aggregates of microcristallinity. X-ray diffraction studies show…
The low-temperature thermoelectricity has been studied extensively for single-crystal graphite and highly oriented pyrolytic graphites (PG) annealed at 3600°c, 3200°c and 2800°c respectively. In the thermoelectric power versus temperature diagram for these specimens, the characteristic phonondrag dip is found to deepe…
The Helfrich theory of conduction-induced alignment in nematic liquid crystals is extended to describe the dependence of alignment upon voltage above threshold. Alignment angle, saturation alignment, flow velocity, and shear are computed. Experimental measurements of these parameters for p-azoxyanisole are in good agr…