Resistencia química del hormigón. IV.-Acción del agua de mar: influencia de la adición de escoria a un cemento portland de alta resistencia inicial. Evolución de las resistencias mecánicas a flexotracción y del coeficiente de corrosión
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The morphotropic phase boundary in PZT solid solutions
PbZrxTi1−xO3 ceramics around the morphotropic phase boundary (MPB) have been prepared under different firing conditions using the usual ceramic techniques. The phases of the compounds have been investigated with X-ray diffraction photographs. It has been found that the MPB is not a narrow and vertically straight bound…
Ternary transition metal phosphides: High-temperature superconductors
Two systems of ternary transition metal phosphides with the ordered Fe(2)P-type hexagonal structure are reported. They have the general formula MRuP and MOsP, in which M can be Ti, Zr, or Hf. An onset of the superconducting transition temperature as high as 13.0 K is reported for the ZrRuP compound.
Preparation of metal-polymer dispersions by plasma techniques. An ESCA investigation
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of metal-polymer dispersions by plasma techniques. An ESCA investigationDerek ShuttleworthCite this: J. Phys. Chem. 1980, 84, 12, 1629–1634Publication Date (Print):June 1, 1980Publication History Published online1 May 2002Published inissue 1 June 1980https://pubs…
Theory of Thermoelasticity With Applications
1 Introduction.- 2 Mathematical groundwork.- 2.1 Tensor calculus.- 2.2 List of useful formulas.- 3 Fundamentals of thermodynamics.- 3.1 System. State. State parameters and functions.- 3.2 The laws of thermodynamics.- 3.3 Nonuniform systems.- 4 Thermodynamics of elastic deformations.- 5 Modes of heat transfer.- 5.1 Rad…
Model of partial crystallization and melting derived from small‐angle X‐ray scattering and electron microscopic studies on low‐density polyethylene
Abstract A temperature‐dependent small‐angle x‐ray scattering and electron microscopic study on a sample of low‐density polyethylene affords a determination of the structure changes in a heating and cooling cycle and suggests a new model of partial crystallization and melting. The analysis of SAXS data is based upon s…
Structural defects in amorphous solids A computer simulation study
A definition of structural defects in amorphous solids in terms of the distribution of the internal stresses on the atomic level and of the symmetry of the environment of individual atoms is introduced. This definition does not require an ideal reference structure. The concept of the internal stresses on the atomic sc…
Dielectric Breakdown Process of Polymers
Much experimental work has been done on the dielectric breakdown of solid dielectrics, and a number of breakdown theories have been proposed. Many problems, however, still remain on the breakdown process of polymers. Here, the breakdown process of polymers are discussed from the standpoint of the inherent properties o…
Threshold switching in chalcogenide-glass thin films
We discuss bias-induced threshold switching in chalcogenide-glass thin films, with an emphasis on the unique aspects of this phenomenon. The electronic nature of both the ON state and the recovery process is now clear. In this paper, we also establish the fundamentally electronic origin of the initiation process. An i…
Direct evaluation of the electron density correlation function of partially crystalline polymers
Abstract A discussion of the general properties of the one‐dimensional electron density correlation function K ( z ) of a partially crystalline polymer with lamellar structure shows that application of a graphical extrapolation procedure permits direct determination of the crystallinity, the specific inner surface, an…
Mechanics of Composite Materials
Some Elements of Mechanics. Effective Moduli: Spherical Inclusions. Effective Moduli: Cylindrical and Lamellar Systems. Bounds of Effective Moduli and Further Results. Laminates. Analysis, Strength, and Design. Wave Propagation. Inelastic and Non-linear Effects. Effective Thermal Properties. Index.
Submicrosecond bistable electro-optic switching in liquid crystals
Ferroelectric smectic C (FSC) liquid crystals are used in a simple new geometry that allows the spontaneous formation of either of two surface-stabilized smectic C monodomains of opposite ferroelectric polarization. These domains are separated by well-defined walls which may be manipulated with an applied electric fie…
Problems in the Study of Supported Metal Catalysts
Our current understanding of catalysis on supported metals is reviewed, and the three most important problems still outstanding in this area of catalysts are discussed: 1) the sintering mechanism of the supported metals, 2) the structure and catalytic properties of small metallic crystals, and 3) catalysis by metal cl…
Nickel Carbonyl: Decomposition in Air and Related Kinetic Studies
Nickel carbonyl [Ni(CO)(4)] is a toxic gas used in the manufacture of metallic nickel which has been shown to be carcinogenic and teratogenic in laboratory studies. Its decomposition in air proceeds at a rate that is strongly dependent on the concentration of carbon monoxide (CO). In the absence of CO, the lifetime in…
New Magnetic Alloys
Three notable new developments in magnetic alloys are highlighted. These include rare earth-cobalt permanent magnets with maximum energy products up to 240 kilojoules per cubic meter; chromium-cobalt-iron permanent magnets that have magnetic properties similar to those of the Alnicos, but contain only about half as mu…
Fiber-Reinforced Composites: Engineered Structural Materials
Fiber-reinforced composites are an emerging new class of engineering materials. The ability to tailor-make composite materials and structures offers exciting opportunities for a broad spectrum of industrial applications. This article reviews the nature of fiber-reinforced polymer composites, their characteristics and…
Conductive Polymers
Recent research has shown that polymers, normally thought of as being insulators, exhibit a wide range of electrical conductive properties.
High-Temperature Structural Ceramics
The unique properties of ceramics based on silicon carbide and silicon nitride make them prime candidates for use in advanced energy conversion systems. These compounds are the bases for broad families of engineering materials, whose properties are reviewed. The relationships between processing, microstructure, and pr…
Sintered Superhard Materials
Diamond or cubic boron nitride particles can be sintered into strong masses at high temperatures and very high pressures at which these crystalline forms are stable. Most of the desirable physical properties of the sintered masses, such as hardness and thermal conductivity, approach those of large single crystals; the…
Decomposition of hydrogen peroxide catalyzed by perchloric acid. Application of this initiation system in the preparation of HO‐terminated telechelic polymers of butadiene
Abstract The kinetics of hydrogen peroxide decomposition was followed in the presence of perchloric acid. The reaction was of second order with respect to the initial concentration of hydrogen peroxide and of first order with respect to the concentration of perchloric acid; the determined activation energy was 102.5 k…