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DOE OSTI2020

Materials Data on CoP3 by Materials Project

CoP3 is Skutterudite structured and crystallizes in the cubic Im-3 space group. The structure is three-dimensional. Co1+ is bonded to six equivalent P+0.33- atoms to form CoP6 octahedra that share corners with six equivalent CoP6 octahedra and corners with twelve equivalent PCo2P2 tetrahedra. The corner-sharing octahedral tilt angles are 59°. All Co–P bond lengths are 2.22 Å. P+0.33- is bonded to two equivalent Co1+ and two equivalent P+0.33- atoms to form distorted PCo2P2 tetrahedra that share corners with four equivalent CoP6 octahedra, corners with ten equivalent PCo2P2 tetrahedra, and an edgeedge with one PCo2P2 tetrahedra. The corner-sharing octahedra tilt angles range from 69–70°. There are one shorter (2.26 Å) and one longer (2.35 Å) P–P bond lengths.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on Nd(CoP3)4 by Materials Project

Nd(CoP3)4 crystallizes in the cubic Im-3 space group. The structure is three-dimensional. Nd3+ is bonded to twelve equivalent P1- atoms to form NdP12 cuboctahedra that share faces with eight equivalent CoP6 octahedra. All Nd–P bond lengths are 2.99 Å. Co+2.25+ is bonded to six equivalent P1- atoms to form CoP6 octahedra that share corners with six equivalent CoP6 octahedra and faces with two equivalent NdP12 cuboctahedra. The corner-sharing octahedral tilt angles are 60°. All Co–P bond lengths are 2.26 Å. P1- is bonded in a 2-coordinate geometry to one Nd3+, two equivalent Co+2.25+, and two equivalent P1- atoms. Both P–P bond lengths are 2.30 Å.

36 MATERIALS SCIENCE↗

NASA NTRS2002

Synthesis and thermoeletric properties of Co(sub (1-x)ni)(sub X)P(sub 3) and CoAs((sub 3-x))P(sub x) skutterudites

Two types of promising phosphide skutterudite materials, Co(1-x)NixP3 (x= 0.025 to 0.70) and CoAs(3-x)Px (x=0.5 to 0.10), have been synthesized and their transport properties measured. These compounds were prepared using a direct synthesis technique. The samples were hot pressed and analyzed by electron microprobe microscopy. Hall Effect measurements were conducted to determine the electrical conductivity, mobility and carrier concentration. In addition, Seebeck voltage and thermal conductivity measurements were performed. The thermoelectric properties are presented anddiscussed as a function of temperature up to 1273 K. The thermal stability of the primary CoP3 was examined in a static vacuum under isothermal and in-gradient conditions. The effect of the presence of 1 atm of a cover gas on the material loss rate was analyzed.

thermoelectric↗