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The phase equilibrium and thermoelectric characteristics of Co(sub 1-x)Fe(sub x)Sb(sub 3) ternary system up to high iron context were investigated. Traces of Sb were found in the hot-pressed samples with x >/= 0.06 and FeSb2 compound with marcasite structure was also found in the samples wih x >/= 0.25 by x-ray diffraction. The lattice parameter of Co(sub 1-x)Fe(sub x)Sb3 was slightly bigger than that of the binary compound CoSb3.

A study was conducted on the effect of substitution of La by alkaline earth metal on the phase stability and thermoelectric properties of gamma-La3S4. The findings indicate that the Seebeck coefficient and electrical resistivity increase and thermal conductivity decreases with an increase of x. Moreover, the substitution for La by alkaline earth metal of La3S4 results in a stable Th3P4-type structure at high temperature.

A study was conducted to examine the microscopic structure and thermoelectric properties of (Zn(sub 1-y)Mg(sub y))(sub 1-x)Al(sub x)O ceramics, and to compare with the experimental results of the samples prepared by the conventional solid-state reaction method. The result indicates that solubility limit of Al in Zn(sub 1-x)Al(sub x)O is about x=0.01, which is confirmed by the (super 27)Al nuclear magnetic resonance spectroscopy.