Ch. 3 Crystalline Structure Flashcards
Non crystalline =
amorphous
Optical properties of amorphous
transparent
Materials wiith cristals
Metals, ceramics, some polymers
Amorphous materials
Complex, rapid cooling, glasses
Plastics are
semi-crystalline
unit cell measurements
10^-9
Main unit cell types
SC, BCC, FCC, HCP
APF formula
(#atoms)(4/3)(pir^3)/a^3
FCC is similar to
hexagonal
Crystal density
p = (#atoms)(atomic weight)/((1 mol)(volume of cell))
Polyphormism meaning
Same element, different crystal structure
General material density heriarchy
metals > ceramics > polymers
7 types of crystal systems
Cubic, Hexagonal, Tetragonal, Rombohedral, Orthorhombic, Monoclinic, triclinic
Cubic crystal
Same distances, 90 degrees on all
Hexagonal
Triangular pattern