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Flashcards in Crystalline Structure Deck (22):
1

Structures that are not crystalline are called?

Amorphous

2

A Simple Cubic structure has a co-ordination number of?

6

3

A Face Centred Cubic structure (FCC) has a co-ordination number of?

12

4

What is a Co-ordination Number?

A coordination number is the number of nearest neighbouring atoms surrounding an atom.

5

A Body Centred Cubic structure (BCC) has a co-ordination number of?

8

6

A Hexagonal Close Packed structure has a co-ordination number of?

12

7

How many atoms are in a Simple Cubic structure?

1 atom

8

How many atoms are in a Body Centred Cubic structure?

2 atoms

9

How many atoms are in a Face Centred Cubic structure?

4 atoms

10

What is the percentage of the volume of atoms in a Simple Cubic structure?

52%

11

What is the percentage of the volume of space in a Simple Cubic structure?

48%

12

What is the percentage of the volume of atoms in a BCC structure?

68%

13

What is the percentage of the volume of space in a BCC structure?

32%

14

What is the percentage of the volume of atoms in a FCC structure?

74%

15

What is the percentage of the volume of space in a FCC structure?

26%

16

What does amorphous mean?

Amorphous is a term used to describe a solid which does not exhibit crystalline structure.

17

What is a crystal structure?

A crystalline structure is the order of atoms, ions or molecules in a crystalline material.

18

What is a unit cell?

A unit cell is the most basic repeating structure of any solid. When connected to the rest of the structure it forms a crystal.

19

What is the definition of a lattice?

A lattice is a geometric arrangement of the points in space at which the atoms, molecules or ions of a crystal occur.

20

What does Polycrystalline mean?

Polycrystalline means that materials have some regions of order.

Alloys are common forms of polycrystalline materials.

21

What is the Frenkel Defect?

The Frenkel Defect is when an atom is displaced from its original lattice point in a crystalline solid.

22

What is the Line Defect?

Line defects happens when a whole row of atoms in a solid are arranged anomalously.