PrYSi2O7 crystallizes in the monoclinic P2_1/c space group. Pr(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(6), and one O(7) atom. Y(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(6), and one O(7) atom. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a trigonal non-coplanar geometry to one O(1), one O(4), and one O(5) atom. In the second Si site, Si(2) is bonded in a tetrahedral geometry to one O(2), one O(3), one O(5), and one O(6) atom. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Pr(1), one Y(1), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Pr(1), one Y(1), and one Si(2) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Pr(1), one Y(1), and one Si(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Pr(1), one Y(1), and one Si(1) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Pr(1), one Y(1), and one Si(2) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Pr(1) and one Y(1) atom.
PrYSi2O7 crystallizes in the monoclinic P2_1/c space group. Pr(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(6), and one O(7) atom. The Pr(1)-O(1) bond length is 2.50 Å. The Pr(1)-O(2) bond length is 2.43 Å. The Pr(1)-O(3) bond length is 2.40 Å. The Pr(1)-O(4) bond length is 2.47 Å. The Pr(1)-O(6) bond length is 2.67 Å. The Pr(1)-O(7) bond length is 2.32 Å. Y(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(6), and one O(7) atom. The Y(1)-O(1) bond length is 2.27 Å. The Y(1)-O(2) bond length is 2.32 Å. The Y(1)-O(3) bond length is 2.24 Å. The Y(1)-O(4) bond length is 2.52 Å. The Y(1)-O(6) bond length is 2.51 Å. The Y(1)-O(7) bond length is 2.19 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a trigonal non-coplanar geometry to one O(1), one O(4), and one O(5) atom. The Si(1)-O(1) bond length is 1.66 Å. The Si(1)-O(4) bond length is 1.64 Å. The Si(1)-O(5) bond length is 1.64 Å. In the second Si site, Si(2) is bonded in a tetrahedral geometry to one O(2), one O(3), one O(5), and one O(6) atom. The Si(2)-O(2) bond length is 1.64 Å. The Si(2)-O(3) bond length is 1.65 Å. The Si(2)-O(5) bond length is 1.63 Å. The Si(2)-O(6) bond length is 1.67 Å. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Pr(1), one Y(1), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Pr(1), one Y(1), and one Si(2) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Pr(1), one Y(1), and one Si(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Pr(1), one Y(1), and one Si(1) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Pr(1), one Y(1), and one Si(2) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Pr(1) and one Y(1) atom.