Chapter 3 Flashcards

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1
Q

Amorphous Materials

A

Short range but no long range order

fast cooling favors an amorphous state

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2
Q

Crystalline Materials

A

Long range order

Slow cooling favors crystal formation

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3
Q

Lattice

A

Periodic collection of points where atoms in a crystal are located

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4
Q

Basis

A

Atom or set of atoms that goes at each lattice point

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5
Q

Unit Cell

A

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

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6
Q

Simple Cubic Lattice

A

No particle on the face or center of volume

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7
Q

Body Centered Cubic

A

A particle in the center of the volume

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8
Q

Face Centered Cubic

A

A particle on each face of the volume

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9
Q

Miller Indices

For Direction

A

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 < >

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10
Q

Miller Indicies

For Planes

A

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 { }

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11
Q

Volume Packing Fractions

A

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

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12
Q

Areal Packing Fraction

A

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

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