Exam1 - ES 260 Name: 1) Exam # 1 February 10, 2009 Student...

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ES 260 Exam # 1 February 10, 2009 Name: Student #: 1) What is the planar atomic density in the (110) plane for the simple cubic structure shown below? Express your answer in units of R -2 . (14 pts.) The figure shown below on the right is a fairly poor drawing of the atomic positions in the SC(110) plane. The planar atomic density (PAD) is given in equation (3.12) as: plane of Area atoms of PAD # ) 110 ( = 2 4 1 4 ) 110 ( 2 a PAD = Since the atoms are touching along the edge of the unit cell, here a = 2R. Substituting, () 2 2 1 ) 110 ( 2 R PAD = 2 8 2 ) 110 ( R PAD =
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2) What is the correct notation for planes A and B below? (10 pts.) Use the upper, left, back corner of the unit cell as the coordinate origin for both cases. A) The x,y,z-intercepts are ½ a, a, -a This translates to h,k,l = ½, 1, -1 Taking the reciprocal, we have h,k,l = 2, 1, -1 This is already the lowest possible set of integers, so this is the ( ) 1 21 plane. B) The x,y,z-intercepts are , ½ a, -a This translates to h,k,l = , ½, -1 Taking the reciprocal, we have h,k,l = 0, 2, -1 This is already the lowest possible set of integers, so this is the ( ) 1 02 plane.
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3) Determine the ionic packing factor for CsCl, which has the structure shown at
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Exam1 - ES 260 Name: 1) Exam # 1 February 10, 2009 Student...

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