1) (From Textbook Problem 3

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1) (From Textbook Problem 3.82 ) The first three diffraction peaks of a metal powder are 20 = 44.4, 64.6, and 81.70 using Cuk -radiation. Is this a bec or an fcc metal? 2. (From Textbook Problem 4.2) The Al-Mg system shows incomplete solid solution . Which of the Hume -Rothery rules are violated ? Note that r = 0.143 nm, r = 0.160 nm, and electronegativityes can be found in Fig. 2.21 (Al: 1.5; Mg: 1.2 ).