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3.091 Fall Term 2004 Homework Quiz #6B solution outline (a) (i) In the cubic unit cell below sketch . (ii) In the cubic unit cell below sketch (002). y z y x z x (b) Calculate the density of atoms in (001) in molybdenum (Mo). Express your answer in units of atoms/cm 2 . Mo is BCC. (001) is the cube face, a square area of a × a . There are atoms at the four corners of the square which are shared with adjacent unit cells; only ¼ of the area of each corner atom lies within the square. So the total number of atoms per square can be expressed as (4 × ¼)
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