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Ceria doped with divalent or trivalent cations is a mixed conductor; conduction occurs predominantly by the motion of oxygen vacancies or by electrons, depending on the departure from stoichiometry. In order to establish the electrolytic domain at which behaves primarily as an ionic conductor with transference number…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTransition metal pentacoordinationAngelo R. Rossi and Roald. HoffmannCite this: Inorg. Chem. 1975, 14, 2, 365–374Publication Date (Print):February 1, 1975Publication History Published online1 May 2002Published inissue 1 February 1975https://pubs.acs.org/doi/10.1021/ic50144a0…
Polarized infrared spectra of oriented crystals of CH2=CHCOOH and CH2=CHCOOD were recorded at various low temperatures.An infrared spectrum of liquid acrylic acid at room temperature was also recorded.Assignments of the observed bands were made with the aid of infrared dichroism and isotopic frequency shift.It was fou…
We analyze, classify, and compare the relative roles of different mechanisms of dislocation dragging, including elastic and inelastic scattering of acoustic and optical phonons by a moving dislocation (phonon wind, Raman scattering, flutter effect) and phonon relaxation (thermoelastic losses, phonon viscosity, relaxat…
A classification is made of complicated impurity associates for erystals of Y3AI5O12-Lu3AI5O12: A3+ (A3+ = Nd3+, Eu3+ or Pr3+), Y3AI5O12- L3AI2Si3O12: Nd3+ (L2+ = Mg2+, Mn2+ or Ca2+) and Y3AI5O12: Sc3+-(Nd3+, Eu3+). The mechanism is investigated of formation of associations of different type by means of an analysis of…
The silver and copper crystals of an eutectic Ag-Cu alloy (71.9 wt% Ag) get a fibre-like shape by wire drawing after a high degree of deformation. The extremely thin silver and copper fibres attain a diameter of about 100 Å at a reduction of cross section η = 99.99%. Such in-situ-produced silver-copper composite wires…
The dependence of the electrical conductivity and thermoelectric power on the mean grain size in 16% Bi2Se3–84% Bi2Te3 (as n-type) and 75% Sb2Te3–25% Bi2Te3 (as p-type) solid solutions is analysed. In p-type materials, the main process by sintering is the reduction of the contact resistance between grains. In n-type m…
It has been found that adding Rh or Ru to MnBi is effective in stabilizing the high−temperature β phase (distorted NiAs structure) relative to the low−temperature α phase (undistorted NiAs structure). This effect has been observed in both evaporated thin films and bulk samples. Addition of 1 at.% Rh to bulk MnBi incre…
Steady-state and time-resolved spectra have been recorded for MgO: ${\mathrm{Cr}}^{3+}$ crystals as a function of temperature, excitation wavelength, and ${\mathrm{Cr}}^{3+}$ concentration. The spectra and lifetimes for emission from the various centers have been determined. Both prompt and delayed broad-band fluoresc…
We present calculations related to the optical properties of PbSe and PbTe in an energy range from 0 to 26 eV based on recently developed band-structure models. The results are compared to measurements of the low-energy real part of the refractive index, to modulated reflectivity measurements for energies up to 6 eV,…
The thermal conductivity of tetrathiafulvalene-tetracyanoquinodimethane (TTF-TCNQ) has been determined through a simultaneous measurement of the specific heat and thermal diffusivity using an ac method. A steplike anomaly has been observed which coincides in temperature with anomalies in the specific heat and electric…
A theory is developed to determine the properties of the interface between two coexisting liquid phases, where one or both of the components comprising the system can be polymeric. The local free energy in the interfacial region of nonuniform composition is expressed in terms of a modified Flory−Huggins free energy of…
The dielectric constant of KTaO 3 has been measured as a function of the applied uniaxial stress normal to the (100), (110) and (111) faces. Under the stress normal to (100) or (110), the induced ferroelectric phase transition has been observed at liquid-helium temperatures. From the analysis of the stress dependence…
Optical spectra of Mo${\mathrm{S}}_{2}$ in the excitonic region were obtained by photoconductivity, photovoltaic effect and wavelength-modulated reflectivity at temperatures of 300 to 4.2 K and in magnetic fields of up to 70 kG. Cleaved natural crystals and synthetic crystals studied in both the Faraday and Voigt conf…
Results of an extensive investigation of the optical properties of CaW${\mathrm{O}}_{4}$: ${\mathrm{Sm}}^{3+}$ are reported. Absorption, fluorescence, and excitation spectra and pulsed fluorescence measurements were obtained at temperatures from below 8 K to room temperature on an undoped single crystal and crystals c…
X-ray photoemission experiments were performed on samples of magnesium and aluminum prepared with clean surfaces in ultrahigh vacuum. Core-level binding energies were in excellent agreement with x-ray emission data. Asymmetries in core-level peaks were observed and are compared with theory. The Mg $\mathrm{KLL}$ Auger…
We have determined the frequency dependence of the nonlinear optical susceptibilities of fused quartz and four other glasses, and determined the relative contributions of "electronic" and "nuclear" mechanisms to their nonlinear optical indices. This is the first such determination in solids. Our method has been to ana…
Core-line asymmetries have been observed in the x-ray-photoemission spectra of a number of metals. They are ascribed to the interaction of the suddenly created potential of the photohole with the conduction electrons. A comparison of the experimental line shapes with those predicted by a theoretical calculation gives…
Optical rotatory power, birefringence and thermal expansion were measured near the structural phase transition point of CsCuCl 3 . All these quantities show discontinuous changes at the transition point. Enantiomorphic domains were observed in the low-temperature phase and irreversible temperature dependence of the op…
Room-temperature electrical resistivity and Hall effect measurements as a function of pressure are reported on p-type MoS 2 and on n-type MoS 2 , MoSe 2 and MoTe 2 . In each case, the resistivity decreases under pressure, due to an increase in the carrier concentration. The Hall mobility is relatively pressure-indepen…