Photograph of an Electron-Hole Drop in Germanium
We present the first photograph of an electron-hole drop in germanium.Received 21 April 1975DOI:https://doi.org/10.1103/PhysRevLett.34.1292©1975 American Physical Society
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The range of homogeneity of VO2 and the influence of the composition on the physical properties. II. The change of the physical properties in the range of homogeneity
The electrical resistivity (semiconductor–metal transition), the thermoelectric power, and the magnetic susceptibility of well-characterized VO2 monocrystals and powdered samples in the range of homogeneity were measured. The physical properties gave no hint of an extension of the range of homogeneity towards oxygen e…
Optical and electrical properties of doped In2O3 films
Sn doped In2O3 films are electrically conductive and transparent in the visible range of the spectrum. Films with a plasma wavelength in the 1 μm region have been prepared by spraying a solution of InCl3 and SnCl4 onto a heated substrate. The free electron concentration is observed to increase with the Sn content up t…
Copper diffusion in single-crystalα−Zr
Tracer diffusion of $^{64}\mathrm{Cu}$ in $\ensuremath{\alpha}\ensuremath{-}\mathrm{Z}\mathrm{r}$ single crystals has been measured in the temperature range (615-860)\ifmmode^\circ\else\textdegree\fi{}C. The temperature dependences of the $^{64}\mathrm{Cu}$ diffusion coefficients in directions parallel to and perpendi…
High-energy optical-absorption bands of transition-metal ions in fluoride host crystals
Absorption bands in the region from 40 000 to 80 000 ${\mathrm{cm}}^{\ensuremath{-}1}$ have been found for the divalent ions of V, Cr, Mn, Fe, Co, and Ni in the host crystals KMg${\mathrm{F}}_{3}$, Ca${\mathrm{F}}_{2}$, and Mg${\mathrm{F}}_{2}$. Their spectral positions are near those of the free-ion $3d\ensuremath{\r…
The Raman spectrum of (TMA)2UCl6 and (TMA)2SnCl6 crystals and of TMACl in solution
The Raman spectrum of (TMA)2UCl6, not reported previously, is presented and the assignments of the observed bands to normal modes of vibration are discussed based on polarized room temperature scans of single crystals. Seventeen of the eighteen fundamental vibrational bands and seven nonfundamental ones are identified…
Fourth-order elastic constants and the temperature dependence of second-order elastic constants in cubic materials
A theory analyzing the temperature dependence of second-order elastic constants on the basis of a quasiharmonic-anisotropic-continuum model is applied to LiBr, KCl, RbF, $\ensuremath{\beta}$-brass, Cu, Ag, and Au. The number of fourth-order elastic constants is reduced from 11 to 2 by assuming that nearest-neighbor (n…
Structure of Nickel Orthophosphate
Ni 3 P 2 O 8 crystallizes in the monoclinic system with space group P2 1 /c with a = 5.830(2), b = 4.700(2), c = 10.107(4) Å, β = 91.22(2)°, and Z = 2. The structure was refined by full-matrix least squares methods to a final R value of 0.035 using 986 symmetry independent reflections. The structure is isotypic with t…
Study of the low-temperature ’’transition’’ in ice Ih by thermally stimulated depolarization measurements
Thermally stimulated depolarization (TSD) current has been measured in polycrystalline H2O and D2O ice in the temperature range 77–260 K and at pressures of about 1 bar and 1.2 kbar. Three peaks in current have been observed at about 1 bar at a heating rate of 0.0023 K sec−1, the smallest of which appears at 110.4 K a…
Analysis of surface- and bulk-plasmon contributions to x-ray photoemission spectra
The plasmon structure accompanying core-level x-ray photoemission in Na, Mg, and Al is reported and analyzed using a model of random spatial emission of extrinsic plasmons. The Mg and Al spectra are well fit by this model without intrinsic plasmon production. The Na data are not explained by purely extrinsic plasmon e…
Theory of electrical instabilities of mixed electronic and thermal origin. II. Switching as a nucleation process
The dynamics of the switching process in amorphous semiconductors is analyzed using a previously described electrothermal model. Utilizing recent preswitching noise data as input, we calculate the switching delay time as a function of current in the low-overvoltage regime in the nucleation approximation. It is found t…
Optical properties of Ti, Zr, and Hf from 0.15 to 30 eV
The absorptivity or reflectivity of polycrystalline samples of Ti, Zr, and Hf was measured from 0.15 to \ensuremath{\sim}30 eV. The data were Kramers-Kronig analyzed to determine the dielectric functions. Between \ensuremath{\sim}0.2 and \ensuremath{\sim}7 eV, each metal showed five structures in the absorptivity and…
The morphology of interlinked porosity in nuclear fuels
Abstract Micro-examination of irradiated uranium dioxide has shown that pores formed along triple-point grain edges play an important part in the swelling of the fuel. When the volume change is greater than 7 % this porosity has the form of long tunnels linking adjacent grain corners and forming an interconnected netw…
New Theory of Coercive Force of Ferromagnetic Materials
We have enlarged the theory of the coercive force to include the wave nature of the ferromagnetic domain walls. Specifically, we obtain an explicit equation for the magnetic field required to move a 180\ifmmode^\circ\else\textdegree\fi{} ferromagnetic domain wall across a planar defect such as a grain boundary. Using…
Evidence for a Smectic-A—Nematic Tricritical Point: Binary Mixtures
Differential scanning calorimetry measurements of the smectic-$A$---nematic latent heat of transition in binary mixtures of ${\mathrm{C}}_{8}$${\mathrm{H}}_{17}$O-${\mathrm{C}}_{6}$${\mathrm{H}}_{4}$-CHN-${\mathrm{C}}_{6}$${\mathrm{H}}_{4}$-${\mathrm{C}}_{3}$ ${\mathrm{H}}_{7}$ (8O.3) and ${\mathrm{C}}_{2}$${\mathrm{H…
Connection between Charge-Density Waves and Superconductivity in NbSe2
A study of the effect of magnetic impurities and magnetic field on the purported charge-density-wave (CDW) transition in Nb${\mathrm{Se}}_{2}$ reveals an intriguing connection between the CDW and the superconducting states. Increasing magnetic impurity concentration results in a reduction of the transition temperature…
The Catalytic Hydrogenation of Ethylene over Calcium Hydride and the Role of the Hydrogen of the Hydride
Abstract The catalytic hydrogenation of ethylene over the non-stoichiometric calcium hydride (CaH2−δ) prepared by means of high-temperature evacuation was studied. The order of introducing gases had no effect on the rate of ethylene hydrogenation. The rate expressions for the initial stage were ν=k PH0.8–1.0 PE and ν′…
Photosensitized oxygenation of trans,trans-1-methylcyclodeca-1,6-diene. Regiospecific hydroperoxidation with singlet oxygen
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotosensitized oxygenation of trans,trans-1-methylcyclodeca-1,6-diene. Regiospecific hydroperoxidation with singlet oxygenSung-Kee Chung and A. Ian ScottCite this: J. Org. Chem. 1975, 40, 11, 1652–1653Publication Date (Print):May 1, 1975Publication History Published online1…
Certain aspects of film blowing of low‐density polyethylene
Abstract This article considers two topics: (1) Cooling of the film bubble and (2) Production of shrinkable film. Heat is transported by conduction, convection, and radiation, but only convection and radiation are relevant for the cooling results. Heat radiation can be calculated with known surface area, temperatures,…
Capability and nature of the amide bond as a transmitter of electronic effects
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCapability and nature of the amide bond as a transmitter of electronic effectsJohn P. Idoux and Rudolfo ZarrilloCite this: J. Org. Chem. 1975, 40, 10, 1519–1521Publication Date (Print):May 1, 1975Publication History Published online1 May 2002Published inissue 1 May 1975https…