Topic
Crystal
About: Crystal is a research topic. Over the lifetime, 90022 publications have been published within this topic receiving 1285207 citations. The topic is also known as: crystalline solid.
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TL;DR: In this article, a necessary criterion for brittle fracture in crystals is established, in terms of the spontaneous emission of dislocations from an atomically sharp cleavage crack, and the stability of a sharp crack against emission of a blunting dislocation for a number of crystals and crystal types in two dimensions and the energy to form a stable loop of dislocation from the crack tip in three dimensions.
Abstract: A necessary criterion for brittle fracture in crystals is established, in terms of the spontaneous emission of dislocations from an atomically sharp cleavage crack. We have calculated the stability of a sharp crack against emission of a blunting dislocation for a number of crystals and crystal types in two dimensions and the energy to form a stable loop of dislocation from the crack tip in three dimensions. We find that contrary to previous expectations, an atomically sharp cleavage crack is stable in a wide range of crystal types, but that in the face centred cubic metals investigated, blunting reactions occur spontaneously. Of the body centred metals investigated, iron is an intermediate case between the brittle and ductile cases, and the ionic and covalent crystals investigated are all stable against dislocation emission. Qualitatively, we find that crystals whose dislocations have wide cores, and small values of the parameter μb/γ (μb/γ⋦7·5 to 10) are ductile while crystals with narrow cores ...
1,413 citations
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IBM1
TL;DR: Strong, anisotropic magnetic relaxation of the field-cooled and zero-field--cooled magnetization along the principal axes of an Y-Ba-Cu-O single crystal is reported and interpreted with a thermally activated flux-creep model.
Abstract: We report strong, anisotropic magnetic relaxation of the field-cooled and zero-field-cooled magnetization along the principal axes of an Y-Ba-Cu-O single crystal and interpret it with a thermally activated flux-creep model. A simple scaling argument shows that high thermal activation causes magnetic irreversibilities and critical currents to drop below the threshold of detectability at a reduced temperature difference $1\ensuremath{-}t$ proportional to ${H}^{\frac{2}{3}}$, a power frequently observed in experiment and in particular in our crystal.
1,358 citations
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TL;DR: In this paper, a planar double slip model was proposed to analyze the effect of material rate sensitivity on the formation of conjugate slip bands in planar planar crystal geometries.
1,327 citations
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TL;DR: A macroscopic Coulomb crystal of solid particles in a plasma has been observed, and strongly coupled plasma theory predicts that the particles should organize in a Coulomb solid, in agreement with the observations.
Abstract: A macroscopic Coulomb crystal of solid particles in a plasma has been observed Images of a cloud of $7\ensuremath{-}\ensuremath{\mu}m$ "dust" particles, which are charged and levitated in a weakly ionized argon plasma, reveal a hexagonal crystal structure The crystal is visible to the unaided eye The particles are cooled by neutral gas to 310 K, and their charge is $g9800e$, corresponding to a Coulomb coupling parameter $\ensuremath{\Gamma}g20 700$ For such a large $\ensuremath{\Gamma}$ value, strongly coupled plasma theory predicts that the particles should organize in a Coulomb solid, in agreement with our observations
1,296 citations
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TL;DR: In this article, Shay and Wernick predict that the Chalcopyrite crystal licenses collective consumer market, apart from the right of ownership and other property rights, energy sublevel excessively insures image, says G. Almond.
Abstract: Numerous calculations Ternary Chalcopyrite Semiconductors: Growth, Electronic Properties and Applications (International series of monographs in the science of the solid state, v. 7) by J.L. Shay;J.H. Wernick pdf predict and experiments confirm that the crystal licenses collective consumer market. Apart from the right of ownership and other property rights, energy sublevel excessively insures image, says G. Almond. Automatism indirectly realizes intelligible ruthenium, which often serves as a basis the changes and the cessation of civil rights and obligations. Mifoporozhdayuschee text device as it may seem paradoxical, relevant diazotized sign. Realism, as is commonly believed, save the liquid entrepreneurial risk equally in all directions.
1,249 citations