3 - EMA 4144 Physical Ceramics Background, Bonds, Energy...

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EMA 4144 Physical Ceramics Background, Bonds, Energy Bands, Models, Crystals and Chemistry
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Objectives for S4 • Review atomic bonding considerations as applied to ceramic materials. t the end of this lecture you should • At the end of this lecture, you should know properties derived from bonding. 2 Wolfgang Sigmund - EMA 4144 Physical Ceramics - August 27, 2009
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Types of Bonding Covalent th (Diamond) d streng t Metallic Ionic (NaCl) (Cu) in bon d crease Van der Waals Hydrogen etween molecules] e) In c 3 (H 2 O [between molecules] ) (Ne)
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Bonding-Property Relations Covalent (directional) high bond energy high T m Ionic (non-directional) high H low ariable bond energy Metallic (non-directional) Variable bond energy moderate T m moderate H Secondary Bonds moderate low bond energy w (non-directional and directional) VDW + Hydrogen: low T m low H high 4 What about Young’s Modulus?
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Properties from Bonding: Elastic modulus , Y pg elastic properties , cross± sectional area A o length, L o Elastic modulus L F undeformed deformed L F A o = E L o nergy Y Energy r o unstretched length Y is larger if E o is larger.
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3 - EMA 4144 Physical Ceramics Background, Bonds, Energy...

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