MSE2020LectureNotes_4_28

MSE2020LectureNotes_4_28 - M SE 2020 4/28/2011 Page 1 of 4...

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MSE 2020 4/28/2011 Page 1 of 4 Exam 3 Review 1. (100) would be 1 st plane but absent (110) next: = + + = + + = d ah2 k2 l2 a12 12 02 32 d 1sinθ smallest angle planes, d will be largest (200) satisfies BCC criteria = d a2 (211) = d a6 2. Pure A: only 1 structure factor A: 000, ½ ½ 0, ½ 0 ½ , 0 ½ ½ = + + + + + + + + = + - - = = = F fAe2πi0 0 0 eπih k eπih l eπil k fA1 1 1 1 0F2 f2 0 3. a. Na 0 0 0 ½ ½ 0 ½ 0 ½ 0 ½ ½ Cl ½ ½ ½ 0 0 ½ 0 ½ 0 ½ 0 0 b. = + ( + + ) + ( + )+ ( + )+ ( + ) FNaCl fNa fCleπi h k l 1 eπi h k eπi h l eπi k l = + ( + + ) + ( + )+ ( + )+ ( + ) FC_dimnd fC fCeπi2 h k l 1 eπi h k eπi h l eπi k l + ( + + ) fC fCeπi2 h k l : basis parameter (changes with basis) 4. 5. Can list all of the members of the family or: 3 choices: 0, 1, -1 3 choices for 1 st x 2 choices for 2 nd x 2 choices for 3 rd = multiplicity factor of 12 6. λ max ? Use Bragg equation as an inequality sinθ 1 2dsinθ 2d λ 2d = λmax 2d 7.
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MSE2020LectureNotes_4_28 - M SE 2020 4/28/2011 Page 1 of 4...

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