Materials Data on Sr21In8Pb7 by Materials Project
Sr21In8Pb7 crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. there are three inequivalent Sr sites. In the first Sr site, Sr is bonded in a 6-coordinate geometry to three equivalent In and three equivalent Pb atoms. All Sr–In bond lengths are 3.59 Å. All Sr–Pb bond lengths are 3.53 Å. In the second Sr site, Sr is bonded to two equivalent In and three Pb atoms to form distorted SrIn2Pb3 trigonal bipyramids that share corners with two equivalent SrPb6 octahedra, corners with five equivalent SrIn2Pb3 trigonal bipyramids, edges with two equivalent SrIn2Pb3 trigonal bipyramids, and faces with four equivalent SrIn2Pb3 trigonal bipyramids. The corner-sharing octahedral tilt angles are 51°. Both Sr–In bond lengths are 3.43 Å. There are two shorter (3.62 Å) and one longer (3.98 Å) Sr–Pb bond lengths. In the third Sr site, Sr is bonded to six equivalent Pb atoms to form corner-sharing SrPb6 octahedra. All Sr–Pb bond lengths are 3.76 Å. In is bonded in a 9-coordinate geometry to six Sr and three equivalent In atoms. All In–In bond lengths are 3.05 Å. There are two inequivalent Pb sites. In the first Pb site, Pb is bonded in a 9-coordinate geometry to nine Sr atoms. In the second Pb site, Pb is bonded in a cuboctahedral geometry to twelve equivalent Sr atoms.