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Steve(Advanced Materials) > Crystallography > Flashcards

Crystallography Flashcards

1
Q

Name the 4 types of crystal structure

A
  • Simple Cubic Structure (cP)
  • Body Centred Cubic Structure (BCC)
  • Face Centred Cubic Structure (FCC)
  • Hexagonal Close Packed Crystal Structure (HCP)
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2
Q

Symmetry in a cP structure

A
  • ax = ay = az

- alpha = beta = gamma = 90deg

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3
Q

Percent Packing Efficiency in cP structure

A

52%

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4
Q

Coordination number of cP structure

A

6

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5
Q

Symmetry in a BCC structure

A
  • ax = ay = az

- aplha = beta = gamma = 90deg

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6
Q

Coordination Number in a BCC structure

A

8

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7
Q

Percent Packing Efficiency in a BCC structure?

A

68%

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8
Q

Examples of cP structure

A

NaCl - Table Salt

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9
Q

Examples of metals with BCC structure

A

Iron, Chromium, Tungsten, Vanadium

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10
Q

What can FCC also be known as?

A

Cubic Closest Packed (CCP)

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11
Q

Symmetry in an FCC structure

A
  • ax = ay = az

- alpha = beta = gamma = 90deg

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12
Q

Coordination number in an FCC structure

A

12

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13
Q

Percent Packing Efficiency in an FCC structure

A

74%

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14
Q

Examples of metals with FCC structure

A

Aluminium, Copper, Nickel, Cobalt

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15
Q

Order in Z direction for cP

A

AAAAAA

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16
Q

Order in Z direction for BCC

A

ABABAB

17
Q

Order in Z direction for FCC

A

ABCABC

18
Q

Symmetry in an HCP structure

A
  • alpha = 120deg
  • beta = gamma = 90deg
  • ax = ay
19
Q

Defects in Crystals

A
  • Vacancies

- Dislocations

20
Q

What kind of defect is a Vacancy?

A

Point Defect

20
Q

What kind of defect is a Vacancy?

A

Point Defect

21
Q

What kind of defect is a dislocation?

A

Linear Defect

22
Q

What increases with quantity of dislocations?

A

Strength

23
Q

5 types of imperfections in metal crystal structures

A
  • Vacancy
  • Self Interstitial Atom
  • Interstitial Atom
  • Substitutional atom (rsubrmatrix)
24
Q

Describe self interstitial atom

A

Same type of atom, wrong place in lattice

25
Q

Describe Substitutional Atom (rsub

A

Not same type of atom, right place in lattice, smaller than other atoms

26
Q

Describe Substitutional Atom (rsub>rmatrix)

A

Not same type of atom, right place in lattice, bigger than other atoms

27
Q

What is what?

A

A. Substitutional Solution (rsub>rmatrix)
B. Perfect Crystal
C. Interstitial Solution
D. Substitutional Solution (rsub

Steve(Advanced Materials) (21 decks)

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