13 - Thermal expansion Discuss the correlation between...

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Thermal expansion • Discuss the correlation between bonding, g, melting points, and thermal expansion. • Outline Young’s modulus concepts. Juan C. Nino - EMA 4144 Physical Ceramics 1 - September 23, 2008 1
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Recall C B e z z E + + = 2 2 1 6 /(ion-pair) r = Na + Cl - r r n 0 4 πε 0 0.28 nm gy E ( r ), e V Separation, r 1.5 eV gy otential ene Cl Na r = Cohesive ene Cl - Na + -6 -6.3 P = e z z E ond 1 1 2 2 1 Juan C. Nino - EMA 4144 Phyiscal Ceramics 1 - August 26, 2008 2 r o = 0.28 nm n r bond 4 0 0
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Recall Covalent (directional) high bond energy high T m Ionic (non-directional) high H low α ariable bond energy Metallic (non-directional) Variable bond energy moderate T m moderate H Secondary Bonds moderate α low bonding energy (directional) VDW + Hydrogen: low T m low H high α Juan C. Nino - EMA 4144 Phyiscal Ceramics 1 - August 26, 2008 3
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Definitions • A crystal is made of atoms which are arranged in a - unit cell. This order is retained over long
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13 - Thermal expansion Discuss the correlation between...

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