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### 27 Cards in this Set

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 Simple Cubic ? atom per cell ? Ao coorindation number Packing factor 1 Atom per cell 2r 6 .52 BCC ? atom per cell ? Ao coorindation number packing factor 2 Atom per cell 4r/sqrt(3) 8 .68 FCC ? atom per cell ? Ao coorindation number packing factor 4 Atom per cell 4r/sqrt(2) 12 .74 Packing Factor (atoms/cell)(volume/atom) ------------------------- (volume/cell) Density (atoms/cell)(atomic mass) ------------------------- (volume/cell)(Avogadro's n) HCP ? atom per cell ? Ao coorindation number packing factor 2 Atom per cell 2r 12 .74 Linear density (# repeat distances) -------------------- distane Linear packing fraction (linear density)(2r) Point Miller Indecies 1. find the vector 2. clear fractions 3. [] Plane Miller Indecies 1. Indentify points 2. Invert 3. clear fractions 4. () Planar Density (atoms/face) ------------ area of face interstitial sites SC coordination cubic site 8 interstitial sites BCC coordination octahedral 6 tetrahedral 4 interstitial sites FCC coordination octahedral 6 tetrahedral 4 Bragg's law sin(th)=lamda/(2d) vaccancies nv=n exp(Q/RT) nv=#vaccancies/cm^3 n=#atoms/cm^3 tetrahedral intersitial sites/cell 12 octahedral intersitial sites/cell 4 Shottky defect missing in stoichiometric amounts Frenkel defect moved to intersitial position slip occurs at high linear density and high planar density elatic deformation temporary plastic deformation permanent dislocation Ao ------------------ sqrt(h^2+k^2+l^2) shear stress tau=sigma*cos(lamda)*cos(phi) grain size sigmay=sigmao+Kd^(-.5) # grains = # # grains@ x100 = N grain size number = n N=(__)/(100)^2(#)=2^(n-1)