Eng 45 - Chapter 1 - Structure(30)

Eng 45 - Chapter 1 - Structure(30) - Materials Scien ce...

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Materials Science Fall, 2007 Page 29 in the transition metals can be described reasonably well in this way. The valence electrons, on the other hand, are so heavily concentrated in the interstitial spaces between atoms that it is not useful to model them in terms of the atomic states. The most useful model for the valence electrons is the nearly free electron model in which the electrons behave as if they were almost free to move through the solid, but are slightly perturbed by their electrostatic interaction with the ion cores. We shall not discuss these models in detail here, though we shall return to the nearly free electron model when we discuss the electromagnetic properties of solids. However, it is important to recognize some of the important qualitative implications of the band model for the type of conduction and the nature of interatomic bonding in solids. 2.4.4 The band model of conductor type Once the available electron states have been identified, the ground state of the
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This note was uploaded on 01/26/2010 for the course ENGLISH 45 taught by Professor Morris during the Spring '10 term at University of California, Berkeley.

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Eng 45 - Chapter 1 - Structure(30) - Materials Scien ce...

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