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 crystal structure of YbFe 2 O 4 was determined and refined by the x-ray method. This compound crystallizes trigonal in the space group R [unk] m with the unit-cell dimensions a = 3.455 ± 0.001, c = 25.054 ± 0.010 Å. The unit cell contains three formula units. The structure consists of the alternating layers of YbO…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption of hydrogen peroxide on the surface of titanium dioxideA. H. Boonstra and C. A. H. A. MutsaersCite this: J. Phys. Chem. 1975, 79, 18, 1940–1943Publication Date (Print):August 1, 1975Publication History Published online1 May 2002Published inissue 1 August 1975https…
Abstract The mineral in monomineralic glauconite pellets is an iron-rich mixed-layer illite-smectite (here called glauconite), often composed almost entirely of illite layers. The nature of the interlayering is closely analagous to that of aluminous illite-smectite and varies with the proportions of the layer types: &…
Abstract Thermal cis‐trans isomerization and decomposition of polyacetylene film prepared with a Ti(OC 4 H 9 ) 4 –Al(C 2 H 5 ) 3 (Al/Ti = 4) system were investigated under inert gas or in vacuum by means of thermal analysis and infrared spectroscopy. Thermograms of differential thermal analysis of cis ‐polyacetylene r…
Abstract LaNiO 3 loses oxygen in well-defined equilibrium stages. Electron diffraction studies show the presence of super-structure due to vacancy ordering in an anion-deficient sample.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structures and dehydrated divalent-copper-exchanged faujasiteI. E. Maxwell and J. J. De BoerCite this: J. Phys. Chem. 1975, 79, 17, 1874–1879Publication Date (Print):August 1, 1975Publication History Published online1 May 2002Published inissue 1 August 1975https://do…
A lattice-imaging technique is applied in a study of the intimate structure of non-graphitizing PVDC C atoms heat treated in the range 803 K to 2973 K. Fine detail in the resulting electron micrographs indicates that the bulk material consists of a high proportion of intertwined crystallites comprising turbostraticall…
Abstract Rigid plastic foams find application in construction mainly as core materials for loaded sandwich structures—in buildings, ground vehicles, and airplanes. This work provides an equation for the mechanical behavior of polyurethane foams as a function of foam density. Starting from a model conception and the qu…
From an analysis of the one-dimensional constant-loss theory of secondary electron emission, maximum yield (δm), primary electron energy at maximum yield (Eom), and both crossover energies EIoc and EIIoc are shown to depend on the surface and bulk properties of the emitting material through simple relations. In partic…
The electrical, optical, and magnetic properties of layered compounds of dichalcogenides of transition metals and intercalated crystals are considered. Particular attention is paid to the anisotropy of these properties and to the analysis of the changes produced by intercalation. Experimental data are presented on the…
A model for anomalous diffusion in the bcc phase of group-$\mathrm{IV}B$ transition metals is proposed, based on the identity of structure of the activated complex for diffusion and the basal plane of the low-temperature metastable $\ensuremath{\omega}$ phase. An expression for the diffusion coefficient is derived fro…
The growth of W grains in sputtered W-${\mathrm{Al}}_{2}$${\mathrm{O}}_{3}$ films as a consequence of annealing results in a narrowing of the transition region from metallic to nonmetallic conductivity. The conductivity, $\ensuremath{\sigma}$, as a function of the volume fraction of the metal, $x$, exhibits a critical…
Abstract Die Titelkomplexe (I) wurden durch Reaktion des Liganden mit den Lanthanoidperchloraten dargestellt und durch Leitfähigkeits‐ und IR‐Untersuchungen ch siert.
The paper is concerned with the development of a satisfactory basis for assessing design stresses. An attempt is made to trace the prime factors involved and details are given of corrosion fatigue tests at various mean stresses on propeller alloys in the form of heavy castings. A new philosophy of design stressing has…
Electron spin resonance has been studied in V 1-x Cr x O 2 compounds in the range fo compositions (0.3%<x<3%). The behaviour of the Cr 3+ resonance in the three insulating phases M 1 , T and M 2 has been examined. Strong modifications of this resonance occur at the M 1 -T phase transition, for which an interpretation…
The dielectric constant (K′) and loss (K″) of single crystals of NaCl, KCl, and KBr have been measured in the frequency region 104 to 107 Hz and in the temperature range 25 to 8 °C below their melting temperatures. The electrical conductivity of these crystals has also been measured at 104 Hz near their melting temper…
Direct experimental evidence is presented concerning the transformation of SnTe. This transformation is proved to be cubic to orthorhombic. The transformation temperature is found to depend on the stoichiometry of this compound, in a way similar to that observed in the isomorphous GeTe, i.e. the transformation tempera…
Abstract The HeI photoelectron spectra of the N‐oxides of the azanaphthalenes 1 – 5 and of the azaanthracenes 6 , 7 were ascertained. The inferred ionisation energies, and the assignments of the spectra, are presented and are discussed in respect to the electronic structures of the N‐oxides and the spectra of the azad…
Dynamic strain aging (DSA) in solid solutions is described as diffusion of solute atoms to mobile dislocations, temporarily arrested at obstacles. As a consequence the solute concentration experienced locally by the dislocations depends on the time of arrest and the solute diffusion coefficient. Starting from this ide…
Most species of the suborder Agnostina are non-intergrading and best fit an allopatric model of speciation. Continued allopatry of some species is indicated by the existence of temporally correlative biofacies. Abrupt introduction of morphologically distinct agnostoid species into many areas suggests that migration of…