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CHEM 111 > L4 - solids > Flashcards

L4 - solids Flashcards

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1
Q

The ABC stacking sequence represents which close packing?

A

cubic close packing

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2
Q

The ABAB stacking sequence represents which type of packing?

A

Hexagonal close packing

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3
Q

What is the coordination number of each sphere in the close-packing of spheres?

A

12

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4
Q

What is the packing efficiency of a body centred cubic packing?

A

68%

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5
Q

What is the highest packing efficiency?

A

face-centred cubic - 74%

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6
Q

In simple cubic packing each sphere has a coordination number of? Think of the same for body centred and face centred

A

6 - octahedral
body centred - 8 - cubic
face centred - 12 - cube-octahedral

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7
Q

Which ions usually sit in interstitial holes?

A

Cations because they are usually smaller as they have a +ve charge

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8
Q

What are the two types of interstitial holes?

A

Octahedral -CN = 6

and tetrahedral - CN = 4

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CHEM 111 (8 decks)

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