Materials Literature
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This paper calculates the energy of formation Ws of Schottky defects in ionic crystals by methods derived from the original method of Mott and Littleton. The main aim of these calculations is to examine the variations in the predicted energies resulting from reasonable variations in the assumed models. The types of va…
A study has been made of the mechanical-relaxation behavior of an ethylene-methacrylic acid copolymer containing 4.1 mole % acid units and its partially ionized sodium salts. Degrees of ionization, estimated from infrared analysis, ranged from 0% to 78%. The weight-percent crystallinity of the samples, determined by d…
The lack of myostatin promotes growth of skeletal muscle, and blockade of its activity has been proposed as a treatment for various muscle-wasting disorders. Here, we have examined two independent mouse lines that harbor mutations in the myostatin gene, ...
Velocity measurements on cracks in sapphire and glass have been made using Wallner lines. Contrary to the view that crack-branching in a given material occurs at a constant critical velocity, it is found that the branching velocity can vary with the stress on the crack. On the other hand, [sgrave]cb1/2- is constant. H…
A study has been made of the electrical conductivity and thermoelectric power of liquid alloys Te1-x Se x with 0≤-x≤-0.5. The temperature range extends from undercooling to about 900°C for electrical conductivity and 750°C for thermoelectric power. A partial conservation after melting of covalent bonds between the ato…
High-voltage dc transmission is becoming increasingly important where heavy loads are to be transmitted over long distances. While most HV dc transmission will probably be overhead, a certain amount of insulated cable will undoubtedly be used for underground, submarine, and indoor work. The electrical stresses in the…
Abstract The thermal stability of a series of linear and branched p ‐phenylene sulphide polymers at 350° has been evaluated by differential thermal analysis, thermogravimetric analysis and weight‐loss studies. It has been concluded that there is some indication that the thermal stability increases with the degree of b…
Abstract Methods of studying oilfield mineral scale deposition in the laboratory do not work for barium sulfate because only small nonadhering crystals are formed. On the other hand, barium sulfate scale found in down-hole or surface equipment is strongly adhering and may contain very large crystals. Results suggest t…
Interaction of the stress field of a favourably oriented edge dislocation with the magnetostriction in a ferromagnetic domain wall in magnetite causes the dislocation to act as a potential well for the domain wall. The coercivity of 20 pm. grains, in which the domain structure is considered to be particularly simple,…
Calorimetric measurements on a sample of TiNi (50 at.%) show that the heat-capacity maximum at approximately 87°C represents a higher-order transition. The transition was shifted to lower temperatures each time the material was heated through the transition from slightly above room temperature to about 150°–200°C. The…
Glass formation was observed in the system ZnO‐TeO 2 in mixtures containing 20 to 40 mole % ZnO. Softening occurred at 350°C and the glasses crystallized at 400°C. High dielectric constants (ca. 20) and high electrical resistivities (ca. 10 11 ohm‐cm −1 ) were measured. The zinc tellurite glasses have a higher density…
Theoretical equations for the strain coefficient of resistance in metallic thin films are derived. The films considered range from ultrathin, discontinuous films of theoretical average thickness of less than an angstrom to relatively thick films of about 6000 Å which exhibit bulk material properties. The films are cla…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTrigonal-prismatic coordination. Crystal and molecular structure of tris (cis-1,2-diphenylethylene-1,2-dithiolato)vanadiumRichard Eisenberg and Harry B. GrayCite this: Inorg. Chem. 1967, 6, 10, 1844–1849Publication Date (Print):October 1, 1967Publication History Published on…
The field intensification factor, β, was found theoretically to be a function of gap length, projection height, and projection tip radius. The electrode projection was approximated by a grounded plane and separate grounded sphere, the opposing electrode by a charged plane. The results may be used to find the height an…
For the purpose of evaluating the electric dipole and the magnetic dipole transition prababilities in Tb 3+ , the reduced matrix elements for 5 D 4 → 7 F J and 5 D 3 → 7 F J have been calculated. From the results, fluorescence colors producible by Tb 3+ -activated phosphors have been predicted: The best green colors w…
Emission at 7618 Å from O2(b 1Σg+) produced in the energy-transfer reaction O(1D)+O2→O2(b 1Σg+)+O(3P),whose rate coefficient is greater than 10−11 cm3/sec, was measured as a function of [O2] and [He]. The O(1D) was produced by photolysis of O2 at 1470 Å. The decrease of O2(b 1Σg+) when N2, CO, CO2, NO, and N2O were ad…
Equipment and techniques for acoustic cavitation w o ~k are desc ribed . . The tes t liquid and its eontainer form part of a se lf sustaining programmable oscIllator. EmphasIs IS laId on the treatme nt of the liquid necessa ry to yield re producible res ults after artificial nucl ea tion ,. especially b y ne utrons ,…
A transverse quadratic electro-optic effect has been observed in a wide range of niobate transparent glass—ceramic systems. The electro-optic constant has been determined as a function of composition, temperature, and wavelength. A semiquantitative measurement of the frequency response has also been made. It has been…
Splat and other rapid quenching techniques were applied to a systematic study of simple oxides, and four new pure oxide glasses were obtained (V 2 O 5 , TeO 2 , MoO 3 , and WO 2 ). The high‐temperature tetragonal form of WO 3 coexists with a metastable short‐range‐order‐only phase. The structure of a new metastable hi…
A low-energy electron diffraction (LEED) system has been used to study the energy spectra of Auger electrons from clean and alkali-covered Ge and Si surfaces. Auger bands characteristic of the substrates were observed for the clean surfaces and the deposition of submonolayer coverages of K and Cs introduced new bands…