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