Composites to Produce a Material with Zero Absolute Thermopower S=0 or a Thermopower Switch between S=0 and S ≠ 0

From the theory of two-phase composites it is concluded that in the concentration dependence of the Seebeck coefficient S a kink can occur precisely at S = 0 absolute if the two phases have different kinds of carriers, electrons and holes, and if the phase grains are spherical without preferred orientations and arranged in a symmetrical fashion. This feature, indeed found to be realized in amorphous Cr1-xSix thin films deposited by ion beam sputtering from Cr-Si alloy targets, can be applied to make reference standards for S = 0 at room temperature and even at higher temperatures. Additionally, it may be used to design a thermopower switch between S = 0 and S not equal 0. It is also concluded that the structure realized in any alloy during solidification does not only depend on the diffusion mobility of the atoms and on the existence of a (relative) minimum in the Gibbs' free energy. It depends also on the fact whether this structure is compatible with the demand that (spatial) continuity of the entropy and energy flux densities and their gradients is saved during the solidification process.

Automated summary

According to the theory of two-phase composites, a kink in the concentration dependence of the Seebeck coefficient can occur precisely at S=0 when two phases have different kinds of carriers and when phase grains are spherical without preferred orientations. This feature has been found in amorphous Cr1-xSix thin films and can be used to create reference standards and design a thermopower switch. The structure of an alloy during solidification not only depends on atom mobility and Gibbs' free energy, but also on maintaining continuity of entropy and energy flux densities and their gradients.