MCE 230_ F10_lec_4 - MCE 230 Materials Science Fall 2010...

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MCE 230 – Materials Science Fall 2010 Lecture - 4
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Atomic Structure
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Bonding Forces Two types of bonding forces: 1. Attractive (F A ): particular type of bonding between two atoms 2. Repulsive (F R ): forces come from the interaction between electrons in the outer shells Both are function of the Interatomic distance (separation) The net for F N = F A + F R When F A = F R then F N = 0 (equilibrium state at r 0 (equilibrium spacing) )
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Potential Energies One can use potential energies instead Bonding energy (E 0 ) : the potential energy required to separate the two atoms to an infinite separation ( potential energy at equilibrium (at r 0 ) Many material properties depend on; the magnitude of (E 0 ), the shape of energy shape and the type of bonding (melting point, modulus of elasticity, thermal expansion, etc. .)
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Types of Bonding Primary bonding: electrons are transferred or shared Secondary bonding: interaction of atomic dipoles ( no electrons are transferred or shared)
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Primary Interatomic Bond Three different types of primary bond are found in solid: 1. Ionic 2. Covalent 3. Metallic The nature of each bond depends on the electron structure of its atoms
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Ionic Bond Between metallic and nonmetallic elements Electron transfer Between +ve and ve ions Characteristics: hard, brittle, electrically and thermally
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MCE 230_ F10_lec_4 - MCE 230 Materials Science Fall 2010...

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