Abstract
Clathrate compounds are expected to have good thermoelectric property; because of their structure. The guest atoms are included in the host cages. Because of weak interaction between the guest and framework atoms, rattling motion can make the lattice thermal conductivity lower, so it may have higher figure-of-merit, ZT. This paper is for Ba8Ga16-xSi30+x (x= -1,0,1) and Ba8-yGa16S30 (y=0,1,2) clathrate compounds. They are prepared by arc-melting and characterized for their structure by x-ray diffraction, electrical resistivity, Seebeck coefficient and thermal conductivity measurements. It is found that the Ba8Ga16Si30 has the biggest ZT=0.06 in room temperature (T=300 K). We estimated that Ba8Ga17Si29 has ZT=1.01 at T=900 K bigger than Ba8Ga16Si30 whose ZT is 0.89 at the same temperature, because Ba8Ga17Si29 has a higher Seebeck coefficient and a lower electrical resistivity.
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