Dy2SiO5 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Dy sites. In the first Dy site, Dy(1) is bonded in a 8-coordinate geometry to one O(5), two equivalent O(2), two equivalent O(3), and three equivalent O(1) atoms. In the second Dy site, Dy(2) is bonded in a 7-coordinate geometry to one O(3), three equivalent O(4), and three equivalent O(5) atoms. Si(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to three equivalent Dy(1) and one Si(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Dy(1) and one Si(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Dy(2), two equivalent Dy(1), and one Si(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to three equivalent Dy(2) and one Si(1) atom. In the fifth O site, O(5) is bonded to one Dy(1) and three equivalent Dy(2) atoms to form a mixture of corner and edge-sharing ODy4 tetrahedra.
Dy2SiO5 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Dy sites. In the first Dy site, Dy(1) is bonded in a 8-coordinate geometry to one O(5), two equivalent O(2), two equivalent O(3), and three equivalent O(1) atoms. The Dy(1)-O(5) bond length is 2.30 Å. There is one shorter (2.36 Å) and one longer (2.49 Å) Dy(1)-O(2) bond length. There is one shorter (2.27 Å) and one longer (2.47 Å) Dy(1)-O(3) bond length. There are a spread of Dy(1)-O(1) bond distances ranging from 2.33-2.72 Å. In the second Dy site, Dy(2) is bonded in a 7-coordinate geometry to one O(3), three equivalent O(4), and three equivalent O(5) atoms. The Dy(2)-O(3) bond length is 2.34 Å. There are a spread of Dy(2)-O(4) bond distances ranging from 2.36-2.60 Å. There are a spread of Dy(2)-O(5) bond distances ranging from 2.24-2.31 Å. Si(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. The Si(1)-O(1) bond length is 1.64 Å. The Si(1)-O(2) bond length is 1.61 Å. The Si(1)-O(3) bond length is 1.67 Å. The Si(1)-O(4) bond length is 1.67 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to three equivalent Dy(1) and one Si(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Dy(1) and one Si(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Dy(2), two equivalent Dy(1), and one Si(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to three equivalent Dy(2) and one Si(1) atom. In the fifth O site, O(5) is bonded to one Dy(1) and three equivalent Dy(2) atoms to form a mixture of corner and edge-sharing ODy4 tetrahedra.