quiz2spr2000b - go from one comer to middle of opposite...

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f~ ~.'~, " Quiz 2 ~ Name ENGSC 3313, Spring 2000 .nswer any 4 Questions onlv.l point each I. Identify the location of the 2 fold symmetry axes in a cube. How many are there? 6. Connect the mid-points of opposite edges! How many atoms are there permm2 in the {110} plane oiFCC nickel oiatomic radius 0.1246 nm? 2 Area .J"2 a2 contains 2 atoms on average. = 0.170 nm2 4R = .J"2 a 1 nm = 10-9 m = 10-6 mm Hence 1 mm2 contains 12 10 X 2 = !J-!J.Q13 0.176 3. ~: Intercepts on x, y, and z axes 1 1 . I Th are -,00, --, respectIve y. us, 3 2 draw plane para1lel to y axis. x Direction: To keep in 1 cell, divide by 3, so largest number is 1. Then, select an origin and proceed l ~ )x, Oy and lz , as shown
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4, The 'c' value is fixed as it is not equivalent to a or b in the tetragonal cell, so the possibilities are -- [120 ], [ 120 ], [210] and [ 210]. On top face, we
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Unformatted text preview: go from one comer to middle of opposite edge. Changing sign right through changes sense of same line in space. Calculate the packing factor of the FCC compound LiP, the ionic radii are 0.068 and 0.133 Dm respectively. 5. Volume of Atoms Volume of Cell P.P.= FCC compound, hence 4 of each per cell and 2r=a 4. j7t (0.0683 + 0.133~ 23(0.068 + 0.133)3 PF= PF=~ Calculate the density of CsCl. Avogadro's number is O.6022x1024, the a.m.u. are Cs = 133 Cl = 35.5. The ionic radii are Cs = O.169nm and Cl- = O.18Inm. Recollect that CsCl does nQ! have the same crystal structure as NaCl. 6. = 4.24 Mg/m3 Draw all the directions of the form <120> in a tetragonal unit cell (a = b # c ; a = r3 = y = 90)...
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This note was uploaded on 01/10/2012 for the course ENSC 3313 taught by Professor Staff during the Fall '11 term at Oklahoma State.

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quiz2spr2000b - go from one comer to middle of opposite...

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