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MCG2361Engineering Materials II

Week 2: CERAMIC MATERIALS

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• Coordination # increases with

 

Adapted from Table 12.2,Callister 7e.

2

r cationr anion

Coord#

< 0.155

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0.225 - 0.414

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0.732 - 1.0

3

4

6

8

linear

triangular

TD

OH

cubic

Adapted from Fig.

12.2, Callister 7e.

Adapted from Fig.12.3, Callister 7e.

Adapted from Fig.12.4, Callister 7e.

ZnS(zincblende)

NaCl(sodiumchloride)

CsCl(cesiumchloride)

r cationr 

anionIssue: How many anions can youarrange around a cation?

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Structure name Structure type Anionpacking Coordination numbers Examples

cation anion

Rock salt (sodiumchloride)

 AX FCC 6 6 NCl, MgO, FeO

Cesium chloride AX Simple cubic 8 8 CsCl

Zinc Blende(sphalerite)

 AX FCC 4 4 ZnS, SiC

Fluorite AX2 Simple cubic 8 4 CaF2, UO2 ThO2 

Perovskite A!X3 FCC 12 (A)6(B)

6 BaTiO3, SrZrO3,SrSnO3 

Spinel A!2X4 FCC 4(A)6(B)

4 MgAl2O4,FeAl2O4 

B%G)2

M1B3

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Properties of Ceramics

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Traditional Ceramics

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Traditional Ceramics - Applications

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Engineering Ceramics

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Deflection of beams

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b

t

Force F

Deflection δ

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Slope E  = σ/ε

Tension

Compression

F Ao

L

σf (compression)

σt (tension)

Ceramics

 

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