Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The characteristics of cation diffusion and ionic conductivity in solid electrolytes are discussed using β- and β″-alumina as examples. The problem is characterized by a cation migration by the vacancy mechanism in a “cation-disordered phase,” a system in which the number of available vacant sites is of the same order…
In this paper we derive from first principles, equations describing the kinetics of luminescent transfer. We apply the Pauli equation to an appropriately defined density matrix to derive, under one formalism but under opposite limiting assumptions, both the usual nonlinear kinetic rate equations and the equations whic…
A model is proposed for electrohydrodynamic alignment effects in cholesteric liquid crystals. We derive and discuss a formula for the threshold voltage of such alignment, starting from the planar texture between two conducting plates. An improved formula for the threshold of the dielectric deformation of this orientat…
X-ray induced electron-emission measurements were used to determine the energy levels of core electrons in ZnO, ZnS, ZnSe, ZnTe, CdO, CdS, CdSe, CdTe, HgS, HgSe, and HgTe. The investigated energy range extends from the bottom of the valence band to about 1200 eV below the Fermi level. Chemical shifts were determined b…
The Raman spectrum of trigonal tellurium has been obtained at 295 and 90 \ifmmode^\circ\else\textdegree\fi{}K. The Raman-active ${A}_{1}$ singlet and two $E$ doublets are identified by the scattering polarization selection rules, and the $E$-mode LO-TO splittings and linear wave-vector shifts are observed. The natural…
The statistics for an arbitrary distribution of traps under nonequilibrium steady-state conditions is derived, and it is seen to be identical in form to the Shockley-Read expression for a single trapping level. The energy dependence of the statistics has been investigated, and several interesting features have been de…
Infrared-reflectivity measurements on InSb surfaces having inscribed line gratings yield the first complete dispersion relation for surface plasmons.Received 10 May 1971DOI:https://doi.org/10.1103/PhysRevLett.27.95©1971 American Physical Society
We have carried out uv photoemission measurements on hexagonal ZnO cleaved in vacuum. The results of this study have placed the $\mathrm{Zn} 3d$ core level at 7.5 \ifmmode\pm\else\textpm\fi{} 0.2 eV below the valence-band maximum, some 3 eV lower than predicted by R\"ossler's Green's-function (Korringa-Kohn-Rostoker)…
The ferroelectric phase of K${\mathrm{H}}_{2}$P${\mathrm{O}}_{4}$ and the antiferroelectric phase of N${\mathrm{H}}_{4}$${\mathrm{H}}_{2}$P${\mathrm{O}}_{4}$ vanish at hydrostatic pressures >17 and 33 kbar, respectively. The results are qualitatively discussed in terms of the coupled proton-lattice model developed…
9, 10-Anthraquiuone (AQ) in an inert aliphatic solvent emits luminescence at room temperature. The emission consists of (1) solution phosphorescence and (2) delayed thermal fluorescence (DTF). We found that similar emission is observed for some AQ and naphthoquinone (NQ) derivatives. The singlet–triplet separation, Δ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPore-size distributions of copper oxide-alumina catalystsKen. Nobe, Muchlas. Hamidy, and Chieh. ChuCite this: J. Chem. Eng. Data 1971, 16, 3, 327–331Publication Date (Print):July 1, 1971Publication History Published online1 May 2002Published inissue 1 July 1971https://pubs.a…
Abstract A white clay from the Jatoba talc mine, Castro, Paraná, Brazil, is shown by chemical analysis, X-ray and electron diffraction, and by thermal analysis to be essentially pure antigorite in the strict sense of the term. Single crystal electron diffraction patterns give various values for the long a parameter, w…
An X‐ray determinative curve has been produced for the rapid analysis of simple silver halides. Complete analyses of thirty‐two specimens of silver halides and examination of approximately fifty more by X‐ray diffraction show that they are, with very few exceptions, embolites with only a few percent of silver iodide p…
Infrared spectroscopic investigations have shown that on the basis of changes in the ν 3 , SO 4 band which occur when calcium sulphate is heated from 400° to 1400 °C, there are two forms of insoluble anhydrite, designated as β′- and β-CaSO 4 . β′-CaSO 4 is metastable and is completely converted into β-CaSO 4 by heatin…
The effect of surface discharges on the ability of polluted insulators to withstand lightning and switching surges has long been a matter of conjecture. This paper describes combined power frequency and impulse voltage tests on 66 kV and 132 kV insulator strings. The tests have shown that an appreciable lowering of bo…
This study was undertaken to measure quantitatively the effect of temperature on the oxygen index values of several fabric samples of cotton, polyester, and their blends. The smoke density generated during the burning of these fabric samples at their oxygen indices was also studied at various temperature conditions. T…
Abstract The kinetics of uncatalyzed autoxidations for polyolefin films, such as atactic and isotactic polypropylene and poly‐(butene‐1) are reviewed in light of recent work. Reaction temperatures generally varied from 100 to 150°C and oxygen concentrations from 5 to 100% by volume. A general reaction scheme is sugges…
The 1H, 2D, 35Cl, and 133Cs NMR of CsMnCl2·2H2O single crystals have been studied. The proton positions could be determined from the observed shift and dipolar splitting and the deuteron positions from the nuclear quadrupole interaction. Conclusions about the hydrogen bonding network were drawn. The rate of the H2O an…
Abstract : Generally, filiform corrosion occurs on aluminum when it is coated with an organic coating and the system is exposed to relatively high humidities. This type of corrosion is initiated or activated by the presence of electrolytes, particularly chloride, and it is fostered by exposures to warm, humid environm…
Dechant's method for determining the total accessibility of cellulose by exchange with deuterium oxide was modified for routine use with cotton fibers. Deuterated cotton was allowed to re-exchange with water or aqueous sodium hydroxide solution and the deuterium oxide content of the liquid used for re-exchange was det…