Chapter 3

Question 1

Crystal Lattice

Answer 1

A 3 - dimensional frame that repeats itself in space for the establishment of LRO

Question 2

Lattice

Answer 2

an arrangement of points each of which is surrounded by an identical grouping of neighboring points

Question 3

Unit Cell

Answer 3

The smallest region that completely describes the pattern

Question 4

The vertices of a unit cell are known as?

Answer 4

Lattice points

Question 5

The lengths of the unit cell edges are known as?

Answer 5

Lattice parameters

Question 6

The name given to the “group of things” located on a lattice point is the?

Answer 6

Basis

Question 7

Name the 7 Lattice types

Answer 7

1. Cubic
2. Tetragonal
3. Hexagonal
4. Orthorhombic
5. Rhombohedral
6. Monoclinic
7. Triclinic

Question 8

Name the parameters of tetragonal lattices

Answer 8

a = b /= c; 
alpha = beta = gamma = 90

Question 9

Name the parameters of Hexagonal lattices

Answer 9

a = b /= c;
alpha = beta = 90;
gamma = 120

Question 10

Name the parameters of Orthorhombic Lattices

Answer 10

a /= b /= c;

alpha = beta = gamma = 90

Question 11

Name the parameters of Rhombohedral lattices

Answer 11

a= b = c;
alpha = beta = gamma /= 90

Question 12

Name the parameters of Monoclinic lattices

Answer 12

a /= b /= c;

alpha = gamma = 90 /= beta

Question 13

Name the parameters for Triclinic Lattices

Answer 13

a /= b /= c;

alpha /= beta /= gamma

Question 14

What is the a - r relation ship for BCC

Answer 14

a = 4r/sqrt(3)

Question 15

What is the a - r relationship for FCC

Answer 15

a = 4r/sqrt(2)

Question 16

Volume of a unit cell for large HCP

Answer 16

(3sqrt(3)/2) a^2*c

Question 17

Linear Density

Answer 17

Number of atoms centered along direction within one unit cell divided by Length of the line contained within one unit cell

Question 18

Planar Density

Answer 18

Number of atoms centered on a plane within one unit cell divided by the area of the plane contained within one unit cell.