This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: N=2.31 x 10 28 lattice sites/m 3 Frenkel defects per cubic meter is 8.24 x 10 23 defects/m 3 12.32 Stoichiometric means having exactly the ratio of anions to cations as specified by the chemical formula for the compound. 12.33 (a) For a Cu 2+ O 2-compound in which a small fraction of the copper ions exist as Cu + , for each Cu + formed there is one less positive charge introduced (or one more negative charge). In order to maintain charge neutrality, we must either add an additional positive charge or subtract a negative charge. This may be accomplished be either creating Cu 2+ interstitials or O 2-vacancies. (b) There will be two Cu+ ions required for each of these defects. (c) The chemical formula for this nonstoichiometric material is Cu 1+ x O or CuO 1-x , where x is some small fraction. 7.6 a) PD 110 (FCC)=0.177/R 2 PD 100 (FCC)=0.25/R 2 PD 110 (FCC)=0.29/R 2 b) PD 100 (BCC)=0.19/R 2 PD 110 (FCC)=0.27/R 2 7.8...
View Full Document
This note was uploaded on 09/15/2011 for the course MEEN 222 taught by Professor Radovic during the Spring '08 term at Texas A&M.
- Spring '08