Materials Data on KPr9(Si3O13)2 by Materials Project
Pr9K(SiO4)6O2 crystallizes in the trigonal P3 space group. The structure is three-dimensional. K1+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of K–O bond distances ranging from 2.65–3.02 Å. There are five inequivalent Pr3+ sites. In the first Pr3+ site, Pr3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Pr–O bond distances ranging from 2.46–2.79 Å. In the second Pr3+ site, Pr3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Pr–O bond distances ranging from 2.46–2.85 Å. In the third Pr3+ site, Pr3+ is bonded in a 6-coordinate geometry to nine O2- atoms. There are a spread of Pr–O bond distances ranging from 2.46–2.91 Å. In the fourth Pr3+ site, Pr3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Pr–O bond distances ranging from 2.30–2.76 Å. In the fifth Pr3+ site, Pr3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Pr–O bond distances ranging from 2.33–2.64 Å. There are two inequivalent Si4+ sites. In the first Si4+ site, Si4+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of Si–O bond distances ranging from 1.63–1.66 Å. In the second Si4+ site, Si4+ is bonded in a tetrahedral geometry to four O2- atoms. There is one shorter (1.61 Å) and three longer (1.66 Å) Si–O bond length. There are ten inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to three Pr3+ and one Si4+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to three Pr3+ and one Si4+ atom. In the third O2- site, O2- is bonded in a 1-coordinate geometry to three Pr3+ and one Si4+ atom. In the fourth O2- site, O2- is bonded in a 1-coordinate geometry to one K1+, two Pr3+, and one Si4+ atom. In the fifth O2- site, O2- is bonded in a 1-coordinate geometry to three Pr3+ and one Si4+ atom. In the sixth O2- site, O2- is bonded in a 1-coordinate geometry to three Pr3+ and one Si4+ atom. In the seventh O2- site, O2- is bonded in a 1-coordinate geometry to one K1+, two Pr3+, and one Si4+ atom. In the eighth O2- site, O2- is bonded in a trigonal planar geometry to three equivalent Pr3+ atoms. In the ninth O2- site, O2- is bonded in a trigonal planar geometry to three equivalent Pr3+ atoms. In the tenth O2- site, O2- is bonded in a 1-coordinate geometry to one K1+, two Pr3+, and one Si4+ atom.