Chapter 3_Part_4

Chapter 3_Part_4 - FCC: Stacking Sequence ABCABCABC. Third...

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16 MSE 2090: Introduction to Materials Science Chapter 3, Structure of solids FCC: Stacking Sequence ABCABCABC. .. Third plane is placed above the “holes” of the first plane not covered by the second plane
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17 MSE 2090: Introduction to Materials Science Chapter 3, Structure of solids HCP: Stacking Sequence ABABAB. .. Third plane is placed directly above the first plane of atoms
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18 MSE 2090: Introduction to Materials Science Chapter 3, Structure of solids Since the entire crystal can be generated by the repetition of the unit cell, the density of a crystalline material, ρ = the density of the unit cell = (atoms in the unit cell, n ) × (mass of an atom, M) / (the volume of the cell, V c ) Density Computations Atoms in the unit cell, n = 2 (BCC); 4 (FCC); 6 (HCP) Mass of an atom, M = Atomic weight, A, in amu (or g/mol) is given in the periodic table. To translate mass from amu to grams we have to divide the atomic weight in amu by the Avogadro number N A = 6.023 × 10 23 atoms/mol The volume of the cell, V
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Chapter 3_Part_4 - FCC: Stacking Sequence ABCABCABC. Third...

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