NaNd9(Si3O13)2 crystallizes in the trigonal P3 space group. Na(1) is bonded in a 6-coordinate geometry to three equivalent O(6) and three equivalent O(9) atoms. There are five inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 9-coordinate geometry to three equivalent O(10), three equivalent O(2), and three equivalent O(5) atoms. In the second Nd site, Nd(2) is bonded in a 9-coordinate geometry to three equivalent O(10), three equivalent O(3), and three equivalent O(5) atoms. In the third Nd site, Nd(3) is bonded in a 9-coordinate geometry to three equivalent O(4), three equivalent O(6), and three equivalent O(9) atoms. In the fourth Nd site, Nd(4) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(7), and one O(9) atom. In the fifth Nd site, Nd(5) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(2), one O(3), one O(4), one O(6), and one O(8) atom. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a tetrahedral geometry to one O(1), one O(4), one O(5), and one O(9) atom. In the second Si site, Si(2) is bonded in a tetrahedral geometry to one O(10), one O(2), one O(3), and one O(6) atom. There are ten inequivalent O sites. In the first O site, O(7) is bonded in a trigonal planar geometry to three equivalent Nd(4) atoms. In the second O site, O(8) is bonded in a trigonal planar geometry to three equivalent Nd(5) atoms. In the third O site, O(9) is bonded in a 4-coordinate geometry to one Na(1), one Nd(3), one Nd(4), and one Si(1) atom. In the fourth O site, O(10) is bonded in a 4-coordinate geometry to one Nd(1), one Nd(2), one Nd(5), and one Si(2) atom. In the fifth O site, O(1) is bonded in a 3-coordinate geometry to one Nd(4), one Nd(5), and one Si(1) atom. In the sixth O site, O(2) is bonded in a 4-coordinate geometry to one Nd(1), one Nd(4), one Nd(5), and one Si(2) atom. In the seventh O site, O(3) is bonded in a 1-coordinate geometry to one Nd(2), one Nd(4), one Nd(5), and one Si(2) atom. In the eighth O site, O(4) is bonded in a 1-coordinate geometry to one Nd(3), one Nd(4), one Nd(5), and one Si(1) atom. In the ninth O site, O(5) is bonded in a 4-coordinate geometry to one Nd(1), one Nd(2), one Nd(4), and one Si(1) atom. In the tenth O site, O(6) is bonded in a 4-coordinate geometry to one Na(1), one Nd(3), one Nd(5), and one Si(2) atom.
NaNd9(Si3O13)2 crystallizes in the trigonal P3 space group. Na(1) is bonded in a 6-coordinate geometry to three equivalent O(6) and three equivalent O(9) atoms. All Na(1)-O(6) bond lengths are 2.51 Å. All Na(1)-O(9) bond lengths are 2.60 Å. There are five inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 9-coordinate geometry to three equivalent O(10), three equivalent O(2), and three equivalent O(5) atoms. All Nd(1)-O(10) bond lengths are 2.50 Å. All Nd(1)-O(2) bond lengths are 2.78 Å. All Nd(1)-O(5) bond lengths are 2.43 Å. In the second Nd site, Nd(2) is bonded in a 9-coordinate geometry to three equivalent O(10), three equivalent O(3), and three equivalent O(5) atoms. All Nd(2)-O(10) bond lengths are 2.49 Å. All Nd(2)-O(3) bond lengths are 2.81 Å. All Nd(2)-O(5) bond lengths are 2.43 Å. In the third Nd site, Nd(3) is bonded in a 9-coordinate geometry to three equivalent O(4), three equivalent O(6), and three equivalent O(9) atoms. All Nd(3)-O(4) bond lengths are 2.85 Å. All Nd(3)-O(6) bond lengths are 2.45 Å. All Nd(3)-O(9) bond lengths are 2.48 Å. In the fourth Nd site, Nd(4) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(7), and one O(9) atom. The Nd(4)-O(1) bond length is 2.49 Å. The Nd(4)-O(2) bond length is 2.45 Å. The Nd(4)-O(3) bond length is 2.42 Å. The Nd(4)-O(4) bond length is 2.55 Å. The Nd(4)-O(5) bond length is 2.81 Å. The Nd(4)-O(7) bond length is 2.29 Å. The Nd(4)-O(9) bond length is 2.45 Å. In the fifth Nd site, Nd(5) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(2), one O(3), one O(4), one O(6), and one O(8) atom. The Nd(5)-O(1) bond length is 2.39 Å. The Nd(5)-O(10) bond length is 2.48 Å. The Nd(5)-O(2) bond length is 2.55 Å. The Nd(5)-O(3) bond length is 2.57 Å. The Nd(5)-O(4) bond length is 2.41 Å. The Nd(5)-O(6) bond length is 2.66 Å. The Nd(5)-O(8) bond length is 2.31 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a tetrahedral geometry to one O(1), one O(4), one O(5), and one O(9) atom. The Si(1)-O(1) bond length is 1.64 Å. The Si(1)-O(4) bond length is 1.66 Å. The Si(1)-O(5) bond length is 1.65 Å. The Si(1)-O(9) bond length is 1.63 Å. In the second Si site, Si(2) is bonded in a tetrahedral geometry to one O(10), one O(2), one O(3), and one O(6) atom. The Si(2)-O(10) bond length is 1.66 Å. The Si(2)-O(2) bond length is 1.66 Å. The Si(2)-O(3) bond length is 1.66 Å. The Si(2)-O(6) bond length is 1.61 Å. There are ten inequivalent O sites. In the first O site, O(7) is bonded in a trigonal planar geometry to three equivalent Nd(4) atoms. In the second O site, O(8) is bonded in a trigonal planar geometry to three equivalent Nd(5) atoms. In the third O site, O(9) is bonded in a 4-coordinate geometry to one Na(1), one Nd(3), one Nd(4), and one Si(1) atom. In the fourth O site, O(10) is bonded in a 4-coordinate geometry to one Nd(1), one Nd(2), one Nd(5), and one Si(2) atom. In the fifth O site, O(1) is bonded in a 3-coordinate geometry to one Nd(4), one Nd(5), and one Si(1) atom. In the sixth O site, O(2) is bonded in a 4-coordinate geometry to one Nd(1), one Nd(4), one Nd(5), and one Si(2) atom. In the seventh O site, O(3) is bonded in a 1-coordinate geometry to one Nd(2), one Nd(4), one Nd(5), and one Si(2) atom. In the eighth O site, O(4) is bonded in a 1-coordinate geometry to one Nd(3), one Nd(4), one Nd(5), and one Si(1) atom. In the ninth O site, O(5) is bonded in a 4-coordinate geometry to one Nd(1), one Nd(2), one Nd(4), and one Si(1) atom. In the tenth O site, O(6) is bonded in a 4-coordinate geometry to one Na(1), one Nd(3), one Nd(5), and one Si(2) atom.