The skutterudite-derivative phase RhGe1.5-xSe1.5+x has been synthesized and structurally characterized by metallography and powder X-ray diffraction data. At x = 0, RhGe1.5Se1.5 displays trigonal sym metry, space group R-3, with unit cell parameters a = 12.0601(8) Å, c = 14.826(1) Å, V = 1867.5(4) Å3, and Z = 24. The crystal structure can be viewed as a modification of the cubic structure of the skutterudite CoAs3, where Ge and Se anions order in layers perpendicular to the  direction of the cubic skutterudite unit cell. Electrical resistivity, Seebeck coefficient and thermal conductivity of the phase RhGe1.5–xSe1.5+x( p-type semiconductor) have been investigated for different x values in the temperature range from 3 to 640 K.
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