75. Diffuse-reflectance spectra of some anhydrous transition-metal halides
R. J. H. Clark, J. Chem. Soc., 1964, 417 DOI: 10.1039/JR9640000417
Materials Literature
文献浏览
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。
Room Temperature Oxidation of Iron at Low Pressures
The oxidation at 300° K of high purity iron surfaces prepared under ultra-high-vacuum conditions was studied using ellipsometry to measure film thickness. By working at low oxygen pressures (between 10–7 and 10–4 torr) it was found that the early stages of the oxidation process followed a linear growth law with rate b…
Shear and Structural Relaxation in Molten Zinc Chloride
Longitudinal ultrasonic absorption and velocity measurements were made in molten zinc chloride in the frequency range 5–95 Mc/sec. Shear relaxation measurements were obtained in the frequency range 43–118 Mc/sec. A single relaxation time was observed for the absorption of longitudinal waves at each temperature investi…
Spectral Properties of Rare Earth Oxide Phosphors
A study of rare earth oxide phosphors activated by rare earths revealed that fluorescence occurs only in those matrices where the cation possesses no unpaired electrons. The fluorescent intensities of the rare earth activators were divided into three categories, strong, medium, and weak, each having a characteristic e…
Effect of Pressure on Young's Modulus and the Glass Transition in Rubbers
Measurements of Young's modulus as a function of pressure up to 10 000 bars at 20°C show that the glass-transition temperature in natural and synthetic rubbers is raised by pressure. For natural gum rubber, the transition occurs at 5100 bars at 20°C and Young's modulus increases 1000-fold on passing through the transi…
Über die Hydroxidhalogenide Me2(OH)3Cl, ‐Br, ‐J zweiwertiger Metalle (Me = Mg, Ni, Co, Cu, Fe, Mn)
Abstract The preparations of the 3:1 hydroxide halides Me 2 (OH) 3 Cl, ‐Br and ‐I of Mg, Ni, Cu, Co, Fe and Mn are described, and the corresponding X‐ray data registered. The following structures were found: Layer structures : (a) C6 type [α‐Mg 2 (OH) 3 Cl, α‐ Ni 2 (OH) 3 CI, α‐Co 2 (OH) 3 Cl, α‐Fe 2 (OH) 3 CI, α‐Mn 2…
392. Topochemistry. Part X. The crystal and molecular structures of 2-chloro-N-salicylideneaniline
The first page of this article is displayed as the abstract.
Structures magnétiques de Cr3X4 (X = S, Se, Te)
Les composés monocliniques pseudo-hexagonaux (groupe I/2m) Cr3X4 = □ Cr2+I (Cr3+II)2 X24- (X = S, Se, Te) dérivent du type NiAs. Les lacunes □ ordonnées du réseau des cations se trouvent dans des plans (101). Dans l'hypothèse d'interactions isotropes, on déduit théoriquement les configurations magnétiques possibles. L…
SEGREGATION AT GRAIN BOUNDARIES
Grain boundaries in crystalline solids exert a pronounced influence on almost all the properties of polycrystalline bodies, as well as affecting the kinetics of most solid-state processes that occur therein. They have therefore been the subject of numerous theoretical and experimental researches in both metallic and n…
Shape of three-fold extended nodes
L. M. Brown and A. R. Thölén, Discuss. Faraday Soc., 1964, 38, 35 DOI: 10.1039/DF9643800035
Activated complex theory applied to the thermal decomposition of solids
_allows a possible interpretation of the mechanism of the. reactions and prediction or the experimental rate constants of similar reactions. The decompositions involving Mgco 3 and Caco 3 a:re m.ost suitable for detailed analysis on the basis of the availabill ty of dependable rate data. and infrared crya tal spectra…
Mechanochemical Anodic Dissolution of Austenitic Stainless Steel in Hot Chloride Solution at Controlled Electrode Potential
The influence of metal yielding on the anodic dissolution rate of 18Cr‐8Ni stainless steel in 42 weight per cent (w/o) aqueous magnesium chloride solution at 154°C has been examined under conditions of controlled potential. At −0.14v ( e H ) in solution flowing at 52 cm/sec to eliminate concentration polarization, yie…
507. Some cyclic tetra-amines and their metal-ion complexes. Part I. Two isomeric hexamethyltetra-azacyclotetradecanes and their copper(II) and nickel(II) complexes
N. F. Curtis, J. Chem. Soc., 1964, 2644 DOI: 10.1039/JR9640002644
The 80 Diperiodic Groups in Three Dimensions
The law-energy electron diffraction work of L. H. Germer, J. J. Lander, A. U. MacRae, J. Morrison and others is resulting in new information about surface structures. These three-dimensional structures have periodicity only in two dimensions. The 230 triperiodic space groups are not applicable to the solution of these…
Molecular Theory for the Tensile Strength of Gum Elastomers
The tensile strength and ultimate elongation properties of any given amorphous elastomer can be described by a characteristic failure curve. It is shown in this paper that the failure curve can be predicted from a knowledge of the creep curve of the elastomer together with the data from a Mooney-Rivlin plot. The theor…
Effects of surface stress relaxation on the electron microscope images of dislocations normal to thin metal foils
The two-beam dynamical theory of Howie and Whelan is used to calculate the electron microscope image contrast from dislocations normal to a thin crystal and parallel to the direction of the incident electron beam. Bending of the lattice planes due to surface relaxation and change in lattice parameter are taken into ac…
Effect of pH, Sulfates, and Chlorides on Behavior of Sodium Chromate and Nitrite as Passivators for Steel
Corrosion rates of iron in chromate and nitrite solutions were measured by a sensitive electric resistance method supplemented by weight loss. The critical concentration below which corrosion increases or pitting occurs is for and for . Presence of Cl − and increases these values. Sulfates break down passivity in nitr…
Fault Structures in Wurtzite
Abstract A more precise interpretation of the defect structure of wurtzite crystals as observed in the electron microscope is presented. It was found previously that the crystals contain faults in the basal planes (b‐faults) and in prism planes (p‐faults). Direct evidence is presented indicating that the transition wu…
Luminescent Behavior of the Rare Earths in Yttrium Oxide and Related Hosts
The absorption, excitation, and fluorescence spectra of are presented and interpreted. The high luminescent efficiency of this material and its unusual performance at elevated temperatures are discussed. The comparative behavior of other rare earths in yttrium oxide and of the rare earths in certain other oxides of yt…
Dynamic Surface Phenomena in the Spontaneous Spreading of Oils on Solids
A study by interference microscopy and ellipsometry shows that the spontaneous spreading of nonpolar liquids on smooth, clean metal surfaces is characterized by the advance from the bulk liquid of a primary film less than 1000 A. thick, usually followed by a thicker secondary film. The movement of the secondary film r…