Answers%20to%20HW4%20problems - N=2.31 x 10 28 lattice...

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4.2 3.52 x 10 18 cm -3 = 3.52 x 10 24 m -3 . 4.4 (a) Pt is the only element that meets all of the criteria and thus forms a substitutional solid solution having complete solubility. (b) Ag, Al, Co, Cr, Fe, and Zn form substitutional solid solutions of incomplete solubility. All these metals have either BCC or HCP crystal structures, and/or the difference between their atomic radii and that for Ni are greater than ±15%, and/or have a valence different than 2+. (c) C, H, and O form interstitial solid solutions. These elements have atomic radii that are significantly smaller than the atomic radius of Ni. 4.9 C Fe =98.87% C C =0.19% C Cr =0.94% 4.10 The number of moles of Cu and Zn are 0.519 and 0.719 respectively. Thus, C Cu =41.9 at% and C Zn =58.1 at%. 4.26 The Burgers vector and dislocation line are perpendicular for edge dislocations, parallel for screw dislocations, and neither perpendicular nor parallel for mixed dislocations. 12.30 the number of lattice sites per cubic meter
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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...
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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.

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Answers%20to%20HW4%20problems - N=2.31 x 10 28 lattice...

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