T4 - bBody Centered Cubic (BCC) BCC has two lattice points...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
Crystal Structure 1 b-Body Centered Cubic (BCC) BCC has two lattice points so BCC is a non-primitive cell. BCC has eight nearest neighbors. Each atom is in contact with its neighbors only along the body- diagonal directions. Many metals (Fe,Li,Na. .etc), including the alkalis and several transition elements choose the BCC structure. a b c
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Crystal Structure 2 2 (0,433a) Atomic Packing Factor of BCC
Background image of page 2
Crystal Structure 3 c- Face Centered Cubic (FCC) There are atoms at the corners of the unit cell and at the center of each face. Face centered cubic has 4 atoms so its non primitive cell. Many of common metals (Cu,Ni,Pb. .etc) crystallize in FCC structure.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Crystal Structure 4 4 (0,353a) FCC 0,74 Atomic Packing Factor of FCC
Background image of page 4
Crystal Structure 5 Atoms Shared Between: Each atom counts: corner 8 cells 1/8 face centre 2 cells 1/2 body centre 1 cell 1 edge centre 2 cells 1/2 lattice type cell contents P 1 [=8 x 1/8] I 2 [=(8 x 1/8) + (1 x 1)] F 4 [=(8 x 1/8) + (6 x 1/2)] C 2 [=(8 x 1/8) + (2 x 1/2)] Unit cell contents Counting the number of atoms within the unit cell
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Crystal Structure 6 Example; Atomic Packing Factor
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 21

T4 - bBody Centered Cubic (BCC) BCC has two lattice points...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online