Mechanical properties and defect chemistry

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Abstract

A brief overview of changes in mechanical properties of solids driven by the chemistry of point defects is given. Two major types of effects are considered: direct effects caused by non-interacting point defects and collective effects induced by interacting point defects. The first group includes (1) changes in the linear dimensions of a solid in response to a change in defect concentration and (2) stress induced due to an inhomogeneous distribution of point defects, a so-called chemical stress. The second group includes (1) defect order-disorder transitions accompanied by self-strain and (2) deviations from linear elastic behavior due to the dissociation/association of point defects. All of the above become important if the concentration of point defects is very high (above 1021 cm- 3). These effects may lead to significant anomalies in mechanical properties: spontaneous stress and strain and changes in elastic constants. These effects may significantly affect the application of materials with a large concentration of point defects.

Original languageEnglish
Pages (from-to)1639-1642
Number of pages4
JournalSolid State Ionics
Volume177
Issue number19-25 SPEC. ISS.
DOIs
Publication statusPublished - Oct 15 2006

Keywords

  • Elasticity
  • Ionic conductors
  • Point defects

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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