Structures of Metals and Ceramics Flashcards
1
Q
dense, order packing
A
crystalline structure
2
Q
non dense random packing
A
noncrystalline
3
Q
What type of materials usually have crystalline structures?
A
Metals, many ceramics, some ploymers
4
Q
structure system crystals use
A
7 structure system
5
Q
What 3 structures do metals have?
A
Body Centered Cubic (BCC), Face Centered Cubic (FCC), and Hexagonal Close-Packed (HCP)
6
Q
APF of HCP
A
0.74
7
Q
APF of FCC
A
0.74
8
Q
Stacking Sequence of FCC
A
ABCABC
9
Q
Stacking Sequence of HCP
A
ABABAB
10
Q
APF of BCC
A
0.68
11
Q
Atoms per cell of BCC
A
2 atoms/cell
12
Q
Atoms per cell of FCC
A
4 atoms/unit cell
13
Q
Atoms per cell of FCC
A
4 atoms/unit cell
14
Q
Equal types of cations and anions, several coordination numbers
A
AX-type
15
Q
only possible when there is significant covalent bonding
A
Bond Hybridization
