Structural and electrical properties of Co1-xRuxSb2

Electrical resistivity, Hall coefficient: thermoelectric power and crystal structure were measured for the pseudo-binary system Co1-xRuxSb2. By the re sults of X-ray analysis, the monoclinic distortion from the orthorhombic ma rcasite structure decreases gradually and disappears at about x=0.14. The e lectrical measurements show that Co1-xRuxSb2 (0 less than or equal tox less than or equal to1) are all semiconductive, in spite of the gradual change of valence electron number, by substituting Ru atom for Co. It was found th at log p of the samples for 0.1 less than or equal tox less than or equal t o0.9 exhibit T-1/4 and T-1/2 temperature dependence in the lower temperatur e range. These temperature changes of p an the same as those of the variabl e range hopping (VRH) conduction in the impurity conduction range of the us ual semiconductors. (C) 2001 Elsevier Science B.V. All rights reserved.