ICT2014 Abstracts

The divalent hexaborides possess large Seebeck coefficient and high electrical conductivity. The reported electrical properties of the divalent hexaborides were scattered, indicating difference in carrier concentration among the samples even though nominal composition was the same. In the present study, we synthesized divalent hexaborides under various conditions and by various methods. The SrB₆ synthesized by borothermal reduction was sintered at various temperatures to elucidate the influence of the temperature on the electrical properties. Absolute value of the Seebeck coefficient decreased and the electrical conductivity increased with increasing sintering temperature, indicating the increase of concentration. Analysis of x-ray diffraction patterns of the samples suggests that boron concentration decreases with increasing sintering temperature. Details and discussions including other divalent hexaborides will be presented at the conference.