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ENME 421 > Exam Questions > Flashcards

Exam Questions Flashcards

1
Q

WHat is the coordination number and cation-anion radius ratio of a linear geometry?

A
  • 2
  • <0.155
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2
Q

WHat is the coordination number and cation-anion radius ratio of a planar equilateral triangle geometry?

A
  • 3
  • 0.155-0.225
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3
Q

WHat is the coordination number and cation-anion radius ratio of a tetrahedron geometry?

A
  • 4
  • 0.225-0.414
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4
Q

WHat is the coordination number and cation-anion radius ratio of a octahedron geometry?

A
  • 6
  • 0.414-0.732
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5
Q

WHat is the cation-anion radius ratio when the coordination number is 8?

A

0.732-1.0

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6
Q

What is the structure type of rock salt?

A

AX

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7
Q

What is the structure type of cesium chloride?

A

AX

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8
Q

What is the structure type of zinc blende?

A

AX

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9
Q

What is the structure type of flourite?

A

AX2

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10
Q

What is the structure type of perovskite?

A

ABX3

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11
Q

What is the structure type of spinel?

A

AB2X4

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12
Q

What is the anion packing factor for rock salt?

A

FCC

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13
Q

What is the anion packing factor for cesium chloride?

A

simple cubic

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14
Q

What is the anion packing factor for zinc blende?

A

FCC

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15
Q

What is the anion packing factor for flourite?

A

simple cubic

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16
Q

What is the anion packing factor for perovskite?

A

FCC

17
Q

What is the anion packing factor for spinel?

A

FCC

18
Q

What is a Frenkel defect?

A

Cation leaves its normal place and moves into an interstitial site

19
Q

What is a schottky defect?

A

The removal of one cation and one anion to an external surface

20
Q

What are the 2 characterisitics of component ions that determine the crystal structure?

A
  1. magnitude of charge on each ion
  2. relative radius of cation/anion
21
Q

How many octahedral and tetrahedral positions exist on anion spheres?

A
  • 1 octahedral on each anion
  • 2 tetrahedral on each anion
22
Q
A

ENME 421 (1 decks)

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