Abstract
The preparation and characterization of the binary arsenopyrite compounds CoSb2 and IrSb2 and IrxCo1 − xSb2 alloys is reported. Single crystals of CoSb2 were grown by the vertical gradient-freeze technique from solutions rich in antimony. Polycrystalline samples of IrSb2 and IrxCo1 − xSb2 alloys were prepared by hot-pressing of prereacted elemental powders. Samples were investigated by X-ray diffractometry, microprobe analysis and density measurements. It was found that a range of solid solutions exists in the system IrxCo1 − xSb2. Samples were also characterized by high temperature electrical resistivity, Seebeck coefficient and thermal conductivity measurements. All materials have p-type conductivity and are semiconductors. A band gap of about 0.98 eV was calculated for IrSb2. Preliminary measurements of the thermoelectric properties of these materials showed that their potential for thermoelectric applications is limited.
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