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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on CoSb2 by Materials Project

CoSb2 is Marcasite-like structured and crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Co2+ is bonded to six Sb1- atoms to form a mixture of edge and corner-sharing CoSb6 octahedra. The corner-sharing octahedra tilt angles range from 49–56°. There are a spread of Co–Sb bond distances ranging from 2.51–2.61 Å. There are two inequivalent Sb1- sites. In the first Sb1- site, Sb1- is bonded in a 3-coordinate geometry to three equivalent Co2+ atoms. In the second Sb1- site, Sb1- is bonded in a 4-coordinate geometry to three equivalent Co2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CoSb2 by Materials Project

CoSb2 is zeta iron carbide structured and crystallizes in the orthorhombic Pnnm space group. The structure is three-dimensional. Co2+ is bonded to six equivalent Sb1- atoms to form a mixture of edge and corner-sharing CoSb6 octahedra. The corner-sharing octahedral tilt angles are 52°. All Co–Sb bond lengths are 2.56 Å. Sb1- is bonded in a 4-coordinate geometry to three equivalent Co2+ atoms.

36 MATERIALS SCIENCE↗
NASA NTRS1995

Preparation and Thermoelectric Properties of IR(sub x)Co(sub 1-x)Sb(sub 2) Alloys

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 solution 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 solution exist in the system IrxCo1-xSb2 for 0.1<x<0.8. 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.

Thermoelectric Properties↗