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ChemInform Abstract The title compounds are prepared from the elements in evacuated quartz ampoules, which are heated to 1150-1350 K. The temp. dependences of the specific electric conductivities, of the Hall coefficients and of the thermoelectromotive forces are determined between 150 and 950 K. Furthermore the width of the forbidden zone, the microhardness, the pyknometric density and the lattice parameters are determined.

CuCr 2 S 4 -based solid solutions containing solute atoms on the Cu or Cr site were studied with the aim of changing the band structure of the spinel to semiconducting, while maintaining a high magnetic ordering temperature. Cu 1 -x M x Cr 2 S 4 and CuCr 2 -x M x S 4 (M = Al, Ga, In, Fe, Co, As) quaternary phases were synthesized, and CuCr 2 S 4 , Cu 0.3 Co 0.7 Cr 2 S 4 , and Cu 0.5 Fe 0.5 Cr 2 S 4 single crystals were prepared using high-temperature solution growth and chemical vapor transport. The magnetic materials were characterized by a variety of techniques.

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