深夜亚洲福利久久

Chapter 25 Electrons in solids: quantum statistics

 

This chapter on the electronic theory of solids starts with a discussion of the principlal types of intermolecular boding mechanisms. This is followed by treatments of (i) classical and (ii) quantum mechanical free electron models.  In the latter case it is found that the statistical distribution of electron energies differs considerably from the Maxwell-Boltzmann distribution encountered in Chapter 12.  The appropriate quantum distribution function for electrons in solids is that of Fermi-Dirac statistics; this is applied to an electron 'gas' and is used to predict the contributions to the specific heat capacity and electrical conductivity from the free electrons in solids. 

An electron is an example of a type of particle called a fermion - all particles with half integral spin are fermions and, like eletrons, obey Fermi-Dirac statistics.  On the other hand, particles with zero or integral spin (bosons) have a completely different quantum statistical distribution governed by Bose-Einsten statistics.  In the final section of the chapter, this is applied to provide an explanation of the phenomenon of superconductivity.

  

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Click on link below to open a downloadable pdf file of the Problems for this Chapter.

Chapter 25 problems.pdf

 

Answers to Chapter 25 problems

Understanding Physics

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