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27 Cards in this Set

  • Front
  • Back
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)