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MTL200 > Chapter 12 - Ceramics > Flashcards

Chapter 12 - Ceramics Flashcards

1
Q

What is a ceramic?

A

A material composed of at least 2 elements, usually ionically bonded, but can be totally covalent

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2
Q

What is an anion?

A

The negatively charged ion

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3
Q

What is a cation?

A

The positively charged ion

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4
Q

Under what conditions are ceramics stable?

A

The net charge is neutral, and the anion is much larger than the cation, and the cations/anions are surrounded by the opposite type

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5
Q

How are the coordination numbers for ceramics determined?

A

The ratio of the radiuses of cation/anion

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6
Q

What are the most common coordination numbers for ceramics?

A

4, 6, 8

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7
Q

What are the types of ceramics?

A

AX-Type, AmXp-Type, and AmBnXp-Type

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8
Q

What are the types of AX Ceramics?

A

Rock Salt structure, Cesium Chloride Structure, and Zinc Blende Structure

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9
Q

What are the properties of rock salts?

A

FCC with coordination number 6, where the cation is at the center of each face

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10
Q

What are the properties of Cesium Chlorides?

A

Coordination number of 8, similar to BCC, where the center is a cation

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11
Q

What are the properties of Zinc Blende

A

FCC with coordination number 4

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12
Q

What is the type of AmXp Ceramics, and its properties?

A

AX2, coordination number 4, similar to the structure of Cesium Chlorides

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13
Q

What are the properties of AmBnXp type ceramics?

A

A cubic structure with 2 cations

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14
Q

What do the crystal structures of ceramics depend on?

A

Stacking of close packed anions, cations in octahedral spots, the manner of which interstitials have cations

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15
Q

What are silicate ceramics?

A

Materials composed of silicon and oxygen

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16
Q

What are the properties of silicates?

A

Strong covalent bonds, and have 3 different types

17
Q

What are properties of Silica?

A

Neutral, not closely packed, low density, high melting points

18
Q

What are properties of Silica Glasses

A

High entropy, lower melting point, low viscosity

19
Q

What shape does a simple silicate take?

A

Isolated Tetrahedron

20
Q

What properties does a layered silicate have?

A

Ionic, covalent, and van-der-waals forces

21
Q

What are the types of carbon ceramics?

A

Diamond, Graphite, and Amorphous

22
Q

What is a Frenkel Defect?

A

Given a cation vacancy, and cation interstitial, when a cation leaves its original position and moves into an interstitial

23
Q

What is a Schottky Defect?

A

Given a cation vacancy and anion vacancy, when a cation and anion move from their original position to the surface

MTL200 (8 decks)

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