Why Silicon Is Hard
- 10 September 1993
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 261 (5127), 1436-1439
- https://doi.org/10.1126/science.261.5127.1436
Abstract
Compared with pure metals and ionic salts, covalent solids such as silicon are hard and brittle because dislocations do not move in them except at high temperatures. A satisfactory explanation for this behavior has been lacking in spite of its great importance for the mechanics of materials and structures. It is shown here that the critical atomic process leading to the observed brittleness is analogous to a chemical substitution reaction. Analysis of this analogy with the aid of a correlation diagram yields the observed high resistive stress and high activation energy. When a kink on a dislocation line moves, it breaks the atomic bonding symmetry, a forbidden process.This publication has 7 references indexed in Scilit:
- The dislocation core in crystalline materialsCritical Reviews in Solid State and Materials Sciences, 1991
- Absolute hardness as a measure of aromaticityTetrahedron Letters, 1988
- Application of Woodward-Hoffmann ideas to solid-state polymorphic phase transitions with specific reference to polymerization of and the black phosphorus to (arsenic) structural transformationPhysical Review B, 1982
- Application of the semiclassical method to polarizationJournal de Physique, 1979
- Flow of covalent solids at low temperaturesJournal of Applied Physics, 1975
- The Conservation of Orbital SymmetryPublished by Elsevier BV ,1971
- Dislocations and Plastic Flow in the Diamond StructureSolid State Physics, 1969