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Unformatted text preview: Self interstitials atom stuck in space between 2 normal lattice sites not so common, metals are closely packed Ceramics o Contain both vacancies and interstitials o Must maintain charge balance o anions are large relative to cations anion interstitials are rare o cations form vacancies and interstitials o anions form only vacancies o Frenkel Defect cation interstitial and cation vacancy pair charge remains balanced a cation has moved/changed its location o Schottky Defect Anion and cation vacancy pair o Nonstoichiometric Stoichiometric - Ratio of cations and anions exactly match chemical formula May occur in ceramics when one ion can have multiple valence states Example: FeO in this state it is 2+ but can be 3+...
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This note was uploaded on 04/07/2008 for the course ENGR 240 taught by Professor Gross during the Fall '07 term at Bucknell.
- Fall '07