Materials Literature
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The incorporation of slip dislocations at the coherent twin boundary has been analysed for the (112) [111] type twins in hexagonal close-packed zinc crystal by applying matrix algebra. The effects of the various dislocation incorporation processes on the growth and untwinning of the existing twin are discussed from th…
Controlled antiferromagnetic domain reversals have been observed in single crystal Cr2O3. Switching between substantially single domain states has been achieved with the simultaneous impression of electric and magnetic fields of approximately 10 kV/cm and 5 kOe, respectively. The switching energy is closely proportion…
The relation between self-diffusion coefficients and grain boundary energy proposed by Borisov et al. (1964) has been examined for various metals. Satisfactory agreement was obtained between observed and calculated values.
Abstract An Hand der bekannten Bewegungsgleichungen für ein einzelnes Feststoffteilchen werden die Voraussetzungen diskutiert, unter denen eine exakte Berechnung der Bewegungsbahnen möglich ist. In zwei Sonderfällen, der Teilchenbewegung ohne Einfluß der Schwerkraft und der Teilchenbewegung in der Vertikalen mit Berüc…
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans the biological, physical, and social sciences.
A high‐temperature X‐ray diffraction study of a high‐purity PbZrO 3 specimen at 25° to 236°C is reported. The symmetry of the perovskite sub‐cell of PbZrO 3 was determined unambiguously by observing the splitting of the line groups N = 12 and N = 16 when the diffraction pattern was indexed on the basis of the perovski…
After prolonged cyclic stressing in rolling contact, AISI 52100 bearing steel parts develop extensive regions of microstructural alteration, designated as white etching areas. These are oriented in predictable directions relative to the rolling track. Lenticular carbides are always associated with these areas. Evidenc…
Laminated, diatomaceous sediments of the Gulf of California consist of regularly alternating light-colored (diatom-rich) and dark-colored (clay-rich) laminae, approximately 2 mm. thick. The mean contents of opal (as diatom frustules) and quartz in the laminae, determined by X-ray diffraction methods, are: light-colore…
The effects of excluded volume on the existence and nature of a phase transition in an infinitely long double-stranded helical polymer are discussed in relation to the recent treatment of Poland and Scheraga, which showed that, if the entropy of a closed polymer loop of 2l links (corresponding to a diassociated length…
Possible patterns of vibration-induced splitting in the absorption band of localized electrons in solid are investigated within the Condon approximation. The modes of lattice vibrations around the imperfection which give rise to the level splitting of degenerate excited states are classified into active and potentiall…
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The elastic constants of zirconium carbide and titanium carbide were determined over the temperature range of 4.2° to 298°K using a pulsed-ultrasonic phase comparison technique, and are compared to previously determined values for uranium carbide. Since these carbides are of the NaCl structure, only three independent…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAbsorption Spectra of Octahedral Lanthanide HexahalidesJack L. Ryan and Chr. Klixbüll JørgensenCite this: J. Phys. Chem. 1966, 70, 9, 2845–2857Publication Date (Print):September 1, 1966Publication History Published online1 May 2002Published inissue 1 September 1966https://pu…
Fine metallic particles exhibit a peak of optical absorption around the frequency of the plasma mode. The absorption is broadened by coupling of the plasma oscillation with the individual electronic states which are quantized in discrete levels. Thus the broadening should not be interpreted as the resistance of free e…
The effects of couple stresses in fluids are considered. Linearized constitutive equations are proposed for force and couple stresses. A series of boundary-value problems are solved to indicate the effects of couple stresses as well as for experiments measuring the various material constants. It is found that a size e…