122ch11e - 48 11.84) a) b) 49 11.90) 50 11.90) (cont.) 51...

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

View Full Document Right Arrow Icon
48 11.84) a) b)
Background image of page 1

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

View Full DocumentRight Arrow Icon
49 11.90)
Background image of page 2
50 11.90) (cont.)
Background image of page 3

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

View Full DocumentRight Arrow Icon
51 11.90) (cont.)
Background image of page 4
52 11.94) a) Calculate the net number of particles in the following cubic unit cells. i) simple cubic unit cell ( primitive cubic u.c.), sc or pc - lattice points at the corners Figure from BLB 10 th ed, Prentice Hall In a simple cubic (sc) crystal structure you have particles at the corner lattice points. Each corner is shared by 8 u.c. When you “pull out” a u.c. from a simple cubic crystal you get 1/8 of a particle (sphere) at each corner. Since 1 corner of the u.c. is shared by 8 other u.c. in the extended crystal lattice, when 1 u.c. is pulled out only 1/8 of a particle (sphere) is at any corner. 1/8 particle/corner x 8 corners = 1 particle/uc Note : There is not 1 whole particle in a sc u.c. but a total of 1 particle in terms of mass and volume.
Background image of page 5

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

View Full DocumentRight Arrow Icon
53 11.94) (cont.) ii) body - centered cubic unit cell, bcc - lattice points at the corners and body center of the cube Figure from BLB 10 th ed, Prentice Hall In a body-centered cubic (bcc) crystal structure you have particles at the corner lattice points and in the middle of the cube (body center). Since 1 corner of the u.c. is shared by 8 other u.c. in the extended crystal lattice, when 1 u.c. is pulled out only 1/8 of a particle (sphere) is at any corner. The particle in the middle of the cube is not shared by any other cubes in the extended lattice (it is a whole particle). (1/8 particle/corner x 8 corners) + ( 1 particle/center x 1 center)=
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 / 14

122ch11e - 48 11.84) a) b) 49 11.90) 50 11.90) (cont.) 51...

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