Chapter 3

Question 1

Amorphous Materials

Answer 1

Short range but no long range order

fast cooling favors an amorphous state

Question 2

Crystalline Materials

Answer 2

Long range order

Slow cooling favors crystal formation

Question 3

Lattice

Answer 3

Periodic collection of points where atoms in a crystal are located

Question 4

Basis

Answer 4

Atom or set of atoms that goes at each lattice point

Question 5

Unit Cell

Answer 5

Smallest subdivision pf the crystal from which it can be reconstructed by tiling

Question 6

Simple Cubic Lattice

Answer 6

No particle on the face or center of volume

Question 7

Body Centered Cubic

Answer 7

A particle in the center of the volume

Question 8

Face Centered Cubic

Answer 8

A particle on each face of the volume

Question 9

Miller Indices

For Direction

Answer 9

1) Form a vector in units of the lattice parameter
2) Clear fractions and reduce to lowest integer
3) Single directions go in [ ] with no commas, negative numbers have bars over them
4) Families of related directions go in < >

Question 10

Miller Indicies

For Planes

Answer 10

1) Find intercepts of the plane. If parallel to an axis the intercept is infinity, if plane passes through the origin, shift origin exactly one unit
2) Take reciprocal
3) Clear fractions, don’t need to reduce
4) Single directions go in ( ) with no commas, negative numbers have bars over them
5) Families of related directions go in { }

Question 11

Volume Packing Fractions

Answer 11

Volume of atoms in a unit cell / volume of the cube

Question 12

Areal Packing Fraction

Answer 12

Area of atoms on the face of a unit cell / Area of the cube’s face