ENGR 220 Ch03_ppt_Callister8e_RK_Part_2

ENGR 220 Ch03_ppt_Callister8e_RK_Part_2 - ANNOUNCEMENTS 1...

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9/30/11 1 Chapter 3 - 1 8 ANNOUNCEMENTS - 1 ± Reading: Chapter 3: all sections except 3.8-3.11, 3.15 and 3.16. ± Midterm #1: Week 4: Tuesday, 10/11/11, 8:00-8:50 am, Main Auditorium Accommodations: LeBow 348, 8:00-10:30 am ± TA Help Session: ± Thu, October 6, 5:00 - ~7:30 pm, CAT 061 ± Week 3 Recitations: Hand in #’s 2.14 & 2.20 (Counts as Quiz 1) Team Project - Unit Cell Building (read ahead for NaCl, Diamond Cubic etc.) Problem Set #2: Chapter 3, #s 3.4, 3.5, 3.8, 3.9 & 3.14 Chapter 3 - 1 9 How to Recognize Different Trees From Quite a Long Way Away
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9/30/11 2 Chapter 3 - 2 0 P Coordination # = 12 Adapted from Fig. 3.1, Callister & Rethwisch 8e. (Courtesy P.M. Anderson) P Atoms touch each other along face diagonals - Note : All atoms are identical; the face-centered atoms are shaded differently only for ease of viewing. Face-Centered Cubic Structure (FCC) e.g.: Al, Cu, Au, Pb, Ni, Pt, Ag 4 atoms/unit cell: 6 face x 1/2 + 8 corners x 1/8 Chapter 3 - 2 1 P ±* :CF 5 :579²79BH9F98 7I6=7 GHFI7HIF9 ³ 0.74 Atomic Packing Factor: FCC the maximum achievable APF APF = 4 3 π ( 2 a /4 ) 3 4 atoms unit cell atom volume a 3 unit cell volume Close-packed directions: Length = 4R = 2 a Unit cell contains: (6 x 1/2) + (8 x 1/8) = 4 atoms/unit cell a 2 a Adapted from Fig. 3.1(a), Callister & Rethwisch 8e.
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9/30/11 3 Chapter 3 - 2 2 A sites B B B B B B B C sites C C C A B sites P ±²³±²³´´´GH57?=B; G9EI9B79 P µ¶ *FC>97H=CB P FCC Unit Cell FCC Stacking Sequence A B C Chapter 3 - 2 3 Hexagonal-Close Packed
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This note was uploaded on 10/07/2011 for the course ENGR 220 taught by Professor Barsoum during the Fall '08 term at Drexel.

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ENGR 220 Ch03_ppt_Callister8e_RK_Part_2 - ANNOUNCEMENTS 1...

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