Modulated, or long-periodic, magnetic structures of crystals
, , , . 439 1. 440 2. 443 3. - 449 4. , 451 5. , 458 6. 463 7. TbAg 2 466 8. 470 . * 472 473 - (SS) - MnAu 2 20 *. (LSW) (TSW) . , - . , , , , .
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。
Ammonia decomposition on (1 1 10) and (0 0 1) surfaces of ruthenium
The decomposition of ammonia on stepped Ru(1 1 10) and flat Ru(0 0 1) surfaces has been investigated by Auger electron spectroscopy, low-energy electron diffraction, thermal-desorption studies and kinetic studies. The reaction takes place at ca. 400 K, and N2 and H2 are formed stoichiometrically. At lower temperatures…
Intermediates in the formation of gold clusters. Preparation and x-ray analysis of [Au7(PPh3)7]+ and synthesis and characterization of [Au8(PPh3)6I]PF6
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntermediates in the formation of gold clusters. Preparation and x-ray analysis of [Au7(PPh3)7]+ and synthesis and characterization of [Au8(PPh3)6I]PF6J. W. A. Van der Velden, P. T. Beurskens, J. J. Bour, W. P. Bosman, J. H. Noordik, M. Kolenbrander, and J. A. K. M. BuskesCi…
Cathode Characteristics of Organic Electron Acceptors for Lithium Batteries
Discharge and charge characteristics of cathode‐active materials for lithium batteries were studied. Electron acceptors of charge transfer complex with high electron affinity were examined as cathode‐active materials because they were expected to have high cell voltage. These electron acceptors are 2,4,7‐trinitro‐9‐fl…
Induced internal redox processes in molybdenum-sulfur chemistry: conversion of tetrathiomolybdate(2-) ion to octathiodimolybdate(2-) ion by organic disulfides
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInduced internal redox processes in molybdenum-sulfur chemistry: conversion of tetrathiomolybdate(2-) ion to octathiodimolybdate(2-) ion by organic disulfidesWie Hin Pan, Mark A. Harmer, Thomas R. Halbert, and Edward I. StiefelCite this: J. Am. Chem. Soc. 1984, 106, 2, 459–4…
The Huggins coefficient as a means for characterizing suspended particles
This theory determines the dependence of the Huggins coefficient kH on the interaction potential between rigid spheres. Hard-sphere interactions represent a minimum, with kH increasing for either attractive or longer-range repulsive potentials. Although derived for model potentials, the sticky sphere for short-range a…
Zirconium in the Nuclear Industry
Description Discusses zirconium extraction and reduction to tubes; recent work on basic properties; fracture properties, including stress-corrosion cracking and hydrogen cracking; high-temperature properties; texture-related work with special interest in creep and growth; and waterside corrosion.
Crystal structure of the low-temperature form of BaB2O4
Determination de la structure cristalline de la forme basse temperature de BaB 2 O 4 . Systeme trigonal-groupe d'espace R3c avec a=8,380 A, α=96,65°. Cette structure est voisine de la forme haute temperature de BaB 2 O 4 , contenant des anions [B 3 O 6 ] 3− quasi-plan. Coordination du baryum differente entre les 2 for…
Structural and electrical properties of (TMTTF)2MF6 salts (M = P, As, Sb). Rôle of the anions
The structural and electrical properties of different (TMTTF)2MF 6 compounds are described and the rôle of the anion size is investigated through the behaviour of the SbF6 salt for which a critical increase of the resistivity occurs below 154 K. The effect of alloying (TMTTF)2SbF6 with AsF6 or PF6 is also studied and…
The Diatom Sex Clock and Its Evolutionary Significance
Diatoms, which possess distinctive skeletal valves of opaline silica, show steady incremental reduction of size with successive vegetative divisions. Size reduction is explained by consistent formation of slightly smaller new valves inside the old ones. Diatoms cannot be induced to become sexual until a certain critic…
Sonochemical switching of reaction pathways in slid–liquid two-phase reactions
Ultrasonic irradiation of a mixture of benzyl bromide, potassium cyanide, and alumina in an aromatic solvent yields benzyl cyanide, whereas mechanical agitation gives the Friedel–Crafts type product; sonication changes the main reaction pathway from aromatic electrophilic to aliphatic nucleophilic substitution.
Dicopper(II) chloro and azido inclusion complexes of the [24-ane-N2S4] binucleating macrocycle. Synthesis, crystal and molecular structures, and spectral, magnetic, and electrochemical properties
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDicopper(II) chloro and azido inclusion complexes of the [24-ane-N2S4] binucleating macrocycle. Synthesis, crystal and molecular structures, and spectral, magnetic, and electrochemical propertiesYvette Agnus, Remy Louis, Jean Paul Gisselbrecht, and Raymond WeissCite this: J.…
Technical Note: The Mechanism of Cathodic Disbondment of Protective Organic Coatings—Aqueous Displacement at Elevated pH
This paper will present evidence indicating that the root cause of cathodic disbondment of protective organic coatings is the displacement of the coating by a high pH aqueous film between the coating and the substrate. This is based upon experiments involving delamination caused by soaking in ammonium hydroxide soluti…
Katoite, a new member of the Ca3Al2(SiO4)3-Ca3Al2(OH)12 series and a new nomenclature for the hydrogrossular group of minerals
The new mineral katoite, Ca3Al2(SiO4)(OH)8, occurs in Pietramassa near Montalto di Castro (Viterbo, Italy), associated with many other hydrated calcium silicates and aluminates in the vugs of a phonolite which effused through argillaceous marls of Pliocene age. Microprobe and TG analyses yielded the empirical formula…
Water durable glasses with ultra low melting temperatures
On montre que les verres de fluorophosphate de plomb et d'etain possedent une association extraordinaire de temperature de transition vitreuse tres basse et de tres bonne resistance a l'attaque de l'eau. Une partie de ce comportement peut etre expliquee par la separation de phases et on propose un modele de structure
The formation and expansion of a toroidal drop moving in a viscous fluid
The deformation of an initially spherical liquid drop moving under the action of gravity in another fluid with which it is completely miscible is investigated under conditions of small values of the drop Reynolds number. It is found experimentally that such a drop evolves into an open torus which subsequently expands,…
Thermotropic liquid crystalline compounds with lateral long‐chain substituents (II).: Synthesis and liquid crystalline properties of 1,4‐Bis [4‐substituted‐benzoyloxy]‐2‐n‐alkylbenzenes
Abstract We synthesized 102 new 1,4‐bis‐[4‐subst.‐benzoyloxy]‐2‐n‐alkylbenzenes of the general formula magnified image with R = alkyl, alkyloxy, alkanoyloxy, alkyloxycarbonyloxy and n = 0 to 16. Surprisingly all of the new compounds are liquid crystalline nematic. Thus it is proved that lateral long chain substituents…
Effects of Defects in Composite Materials
Description Discusses the effects of defects on strength, stiffness, stability, and service life of composite material. 14 papers discuss the observation and measurement of defect location and size; experimental evidence of consequences of defect; analytical models for predicting defect behavior; and observations of f…
A phenomenological gibbs function for BaTiO3 giving correct e field dependence of all ferroelectric phase changes
The elastic Gibbs function for BaTiO3 introduced by Buessem, Goswami and Cross1 has been modified by including the last symmetry permitted sixth order term HP12P22P32 with a coefficient H = 4.91 × 109 Vm9 C-5. The function predicts the correct high electric field behavior of the low temperature ferroelectric: ferroele…
Phase diagrams of mesomorphic mixtures
We have combined the Maier Saupe theory [1] of the nematic-isotropic transition and the Flory Huggins theory of mixtures to describe the phase diagrams of two nematogens A + B. The two components can have different order parameters SA, SB in the mixture. We can then predict the morphology of the phase diagrams in term…