Ce2SiTeO4 crystallizes in the orthorhombic Pbcm space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 6-coordinate geometry to three equivalent Te(1), two equivalent O(2), and four equivalent O(1) atoms. In the second Ce site, Ce(2) is bonded in a 6-coordinate geometry to four equivalent Te(1), two equivalent O(1), and four equivalent O(2) atoms. Si(1) is bonded in a tetrahedral geometry to two equivalent O(1) and two equivalent O(2) atoms. Te(1) is bonded in a 7-coordinate geometry to three equivalent Ce(1) and four equivalent Ce(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Ce(2), two equivalent Ce(1), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Ce(1), two equivalent Ce(2), and one Si(1) atom.
Ce2SiTeO4 crystallizes in the orthorhombic Pbcm space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 6-coordinate geometry to three equivalent Te(1), two equivalent O(2), and four equivalent O(1) atoms. There is one shorter (3.22 Å) and two longer (3.39 Å) Ce(1)-Te(1) bond lengths. Both Ce(1)-O(2) bond lengths are 2.63 Å. There are two shorter (2.49 Å) and two longer (2.52 Å) Ce(1)-O(1) bond lengths. In the second Ce site, Ce(2) is bonded in a 6-coordinate geometry to four equivalent Te(1), two equivalent O(1), and four equivalent O(2) atoms. There are two shorter (3.39 Å) and two longer (3.67 Å) Ce(2)-Te(1) bond lengths. Both Ce(2)-O(1) bond lengths are 2.56 Å. There are two shorter (2.55 Å) and two longer (2.56 Å) Ce(2)-O(2) bond lengths. Si(1) is bonded in a tetrahedral geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Si(1)-O(1) bond lengths are 1.66 Å. Both Si(1)-O(2) bond lengths are 1.65 Å. Te(1) is bonded in a 7-coordinate geometry to three equivalent Ce(1) and four equivalent Ce(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Ce(2), two equivalent Ce(1), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Ce(1), two equivalent Ce(2), and one Si(1) atom.