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BCC Structure. atoms?Formula? - 2 atoms
4R=√3 a
FCC Structure. atoms?Formula? - 4 atoms
4R=√2 a
Atomic Packing Factor (APF) - (volume of atoms in unit cell)/(volume of unit cell)
Density Formula - =(n)(A)/(Vc)(Na)
Density of Materials in order - metal>ceramics>polymers
Meaning of paranthesis;
( ),< >, { }, [ ] - (planes), <family of directions>, {family of planes}, [directions]
Bragg's Equation - nλ=2 d sinθ
If diffraction angle is given what must happen to it to use in formula. - divide diffraction
angle by two to use in formula.
interplanar spacing equation -
Conditions for Diffraction in;
FCC?
BCC? - FCC= h,k and l must all be odd or even
BCC=h,k and l must add up to an even number
Define Vacancy Diffusion - atoms exchange with vacant spots