ABSTRACT
It is o¿en argued that one of the main reasons for the di²culty in increasing ZT is the complicated relation among the three thermoelectric properties, S, σ, and κ. Since one of them cannot be controlled
7.1 Introduction .......................................................................................7-1 7.2 Linear Response šeory .................................................................. 7-2
7.3 Evidences Proving the Validity of Linear Response šeory .....7-10 7.4 Lattice šermal Conductivity and Phonon Dispersion ............7-14 7.5 Guiding Principle to Produce New šermoelectric Materials ..... 7-15
7.6 Development of New šermoelectric Materials .........................7-19 7.7 Remaining Problems ...................................................................... 7-24 7.8 Summary .......................................................................................... 7-25 References .................................................................................................... 7-25
without a¤ecting the others, it is widely believed that the balanced condition for the maximum ZT is hardly obtained. še di¤erence of the theoretically predicted behaviors of thermoelectric properties from the experimentally observed ones also makes it di²cult to develop a material possessing a very high ZT value. In order to develop thermoelectric generators of high performance, therefore, we should know the factors for the three thermoelectric properties from a microscopic point of view and construct the guiding principle to optimize the balance of three thermoelectric properties.
