AC LEC 07-09

AC LEC 07-09 - Lecture 7 - Crystallography: Unit Cell...

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Lecture 7 - Crystallography: Unit Cell Density Calculations Linear Density close-packed directions Planar Density close-packed planes Volume Density
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Linear Atomic Density Linear atomic density = (No. of atomic Φ in length l ) / (length of l ) Selected reference length based on unit cell dimension. Close-packed directions most interesting/important high planar density planes
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Linear Atomic Density: BCC Close Packed Direction Cube Diagonal = [111] Linear Density = 2 atoms/ 3a a
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Linear Atomic Density: FCC a Close Packed Direction Face Diagonal = [110] Linear Density = 2 atoms/ 2a
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Planar Atomic Density Planar atomic density = (No. of atoms in area A) / (area A in mm 2 ) Selected area based on unit cell dimension. Atom centroids must lie in plane Close-packed planes most important planes lowest value of miller indices
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Planar Atomic Density: BCC BCC PLANES MOVIE
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Planar Atomic Density: FCC FCC PLANES MOVIE
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Volume Density ρ
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AC LEC 07-09 - Lecture 7 - Crystallography: Unit Cell...

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