Direct Observation of Dislocations in Sapphire

Abstract

HE data presented by these authors are valuable in showing the formation of certain compounds, in identifiable amounts, during the reactions of the cement minerals with water in pastes. The writer42 has pointed out that the reactions of the cement minerals with water are almost certainly solid-liquid reactions in which the solids react with water, without first going into solution, to form solid reaction products; i.e., product solids. These product solids tend to dissolve in water to form solutions from which either stable or metastable products crystallize. For example, the product solids formed by the solid-liquid reaction of CaA and CIS with water tend to dissolve and yield a solution containing the equivalent of CaO, Algol, and SiO2. It is readily understandable that the compound C3AHs containing some silica could crystallize from such a solution. A similar solution would

Electron Microscopy

“…Sapphire was examined by Voruz, Jewett, and Accountius (470) for dislocation defects as a prelude to investigations on the factors influencing the mechanical behavior in ceramics. Luminescent, rhomboidal particles, derived from a photosynthetic and luminescent marine flagellate, were studied by De Sa, Hastings, and Vat ter (119).…”

Studies of Ceramic Processing

“…Recently this instrument was found extremely valuable for the direct determination of defect structure (Refs. [17][18][19][20][21][22]. When the electron microscope is used in transmission through a thin ample, both defect strcture and crystal structure of extremely small areas can be determined.…”