AC LEC 04-09

AC LEC 04-09 - Lecture 4 - Bonding: Materials Classes and...

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Lecture 4 - Bonding: Materials Classes and Properties Bonding in the Materials Classes Metals, Ceramics, Polymers Electronic Materials Ionic, covalent, metallic, secondary, and mixed bonding Properties Melting Point, Thermal Expansion, Modulus of Elasticity
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Synopsis of Bonding Type of Bond Number of electrons “shared” Kinds of atoms involved Remarks Van der Waals 0 Same Weak electrostatic attraction due to unsymmetrical electrical charges in electrically neutral atoms or molecules Ionic 1 or more transferred Different Strong electrostatic attraction Limited ductility bonds Covalent: Normal 2 Same or different Electron pair revolves in common orbit about both nuclei, one atom supplying one electron; Hard bonds Covalent: Coordinate 2 Different Electron pair revolves in common orbit about both nuclei, one atom supplying both electrons, the other supplying none (quite rare) Metallic Infinite Same General attraction of a very large number of positive (metallic) ions for a dispersed cloud of electrons Soft and ductile bonds
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Bonding - Materials Classes Also see handout from C.O. Smith’s book
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AC LEC 04-09 - Lecture 4 - Bonding: Materials Classes and...

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