Materials Data on Pr3(Ni9Ge4)4 by Materials Project

Abstract

Pr3(Ni9Ge4)4 is Bergman Structure: Mg32(Al,Zn)49 Bergman-like structured and crystallizes in the tetragonal P422 space group. The structure is three-dimensional. there are three inequivalent Pr sites. In the first Pr site, Pr is bonded in a 8-coordinate geometry to sixteen Ni and eight equivalent Ge atoms. There are eight shorter (3.37 Å) and eight longer (3.48 Å) Pr–Ni bond lengths. All Pr–Ge bond lengths are 3.35 Å. In the second Pr site, Pr is bonded in a 8-coordinate geometry to sixteen Ni and eight equivalent Ge atoms. There are eight shorter (3.35 Å) and eight longer (3.45 Å) Pr–Ni bond lengths. All Pr–Ge bond lengths are 3.37 Å. In the third Pr site, Pr is bonded in a 8-coordinate geometry to sixteen Ni and eight equivalent Ge atoms. There are eight shorter (3.37 Å) and eight longer (3.46 Å) Pr–Ni bond lengths. All Pr–Ge bond lengths are 3.41 Å. There are five inequivalent Ni sites. In the first Ni site, Ni is bonded in a 11-coordinate geometry to one Pr, six Ni, and four Ge atoms. There are a spread of Ni–Ni bond distances ranging from 2.40–2.68 Å. There are a spread of Ni–Ge bond distances ranging from 2.50–2.58 Å. In the second Ni site, Ni is bonded in a 12-coordinate geometry to two Pr, six Ni, and four Ge atoms. There are a spread of Ni–Ni bond distances ranging from 2.41–2.66 Å. There are a spread of Ni–Ge bond distances ranging from 2.51–2.63 Å. In the third Ni site, Ni is bonded to eight Ni and four Ge atoms to form a mixture of distorted corner and face-sharing NiNi8Ge4 cuboctahedra. All Ni–Ni bond lengths are 2.38 Å. There are two shorter (2.38 Å) and two longer (2.39 Å) Ni–Ge bond lengths. In the fourth Ni site, Ni is bonded in a 11-coordinate geometry to one Pr, eight Ni, and two Ge atoms. There are a spread of Ni–Ni bond distances ranging from 2.41–2.62 Å. There are one shorter (2.46 Å) and one longer (2.49 Å) Ni–Ge bond lengths. In the fifth Ni site, Ni is bonded to two Pr, eight Ni, and two Ge atoms to form distorted NiPr2Ni8Ge2 cuboctahedra that share corners with seven NiNi8Ge4 cuboctahedra, edges with four equivalent NiPr2Ni8Ge2 cuboctahedra, and faces with six NiNi8Ge4 cuboctahedra. There are a spread of Ni–Ni bond distances ranging from 2.43–2.63 Å. There are one shorter (2.49 Å) and one longer (2.55 Å) Ni–Ge bond lengths. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a 11-coordinate geometry to one Pr, seven Ni, and three Ge atoms. There are two shorter (2.65 Å) and one longer (2.72 Å) Ge–Ge bond lengths. In the second Ge site, Ge is bonded in a 12-coordinate geometry to two Pr, seven Ni, and three Ge atoms. Both Ge–Ge bond lengths are 2.67 Å.