Ba2Ce2Ti2Fe(Si4O13)2 crystallizes in the monoclinic C2 space group. Ba(1) is bonded in a distorted q6 geometry to one O(1), one O(10), one O(2), one O(7), one O(8), one O(9), two equivalent O(14), and two equivalent O(4) atoms. Ce(1) is bonded in a 7-coordinate geometry to one O(11), one O(12), one O(13), one O(5), one O(6), and two equivalent O(3) atoms. Ti(1) is bonded to one O(1), one O(11), one O(12), one O(14), one O(2), and one O(4) atom to form TiO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and  an edgeedge with one Ti(1)O6 octahedra. Fe(1) is bonded in a distorted see-saw-like geometry to two equivalent O(13) and two equivalent O(6) atoms. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(14), one O(3), one O(7), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Si(3)O4 tetrahedra, and  a cornercorner with one Si(4)O4 tetrahedra. The corner-sharing octahedral tilt angles are 46°. In the second Si site, Si(2) is bonded to one O(10), one O(13), one O(4), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Si(3)O4 tetrahedra, and  a cornercorner with one Si(4)O4 tetrahedra. The corner-sharing octahedral tilt angles are 47°. In the third Si site, Si(3) is bonded to one O(10), one O(11), one O(5), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, and  a cornercorner with one Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 41°. In the fourth Si site, Si(4) is bonded to one O(12), one O(6), one O(8), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, and  a cornercorner with one Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 43°. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted L-shaped geometry to two equivalent Ba(1) and two equivalent Ti(1) atoms. In the second O site, O(2) is bonded in a distorted L-shaped geometry to two equivalent Ba(1) and two equivalent Ti(1) atoms. In the third O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Ce(1) and one Si(1) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to two equivalent Ba(1), one Ti(1), and one Si(2) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Ce(1) and one Si(3) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Ce(1), one Fe(1), and one Si(4) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Ba(1), one Si(1), and one Si(3) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one Ba(1), one Si(1), and one Si(4) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one Ba(1), one Si(2), and one Si(4) atom. In the tenth O site, O(10) is bonded in a 2-coordinate geometry to one Ba(1), one Si(2), and one Si(3) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one Ce(1), one Ti(1), and one Si(3) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to one Ce(1), one Ti(1), and one Si(4) atom. In the thirteenth O site, O(13) is bonded in a 3-coordinate geometry to one Ce(1), one Fe(1), and one Si(2) atom. In the fourteenth O site, O(14) is bonded in a 2-coordinate geometry to two equivalent Ba(1), one Ti(1), and one Si(1) atom.
Ba2Ce2Ti2Fe(Si4O13)2 crystallizes in the monoclinic C2 space group. Ba(1) is bonded in a distorted q6 geometry to one O(1), one O(10), one O(2), one O(7), one O(8), one O(9), two equivalent O(14), and two equivalent O(4) atoms. The Ba(1)-O(1) bond length is 2.91 Å. The Ba(1)-O(10) bond length is 3.00 Å. The Ba(1)-O(2) bond length is 2.92 Å. The Ba(1)-O(7) bond length is 2.89 Å. The Ba(1)-O(8) bond length is 3.00 Å. The Ba(1)-O(9) bond length is 2.92 Å. There is one shorter (2.98 Å) and one longer (2.99 Å) Ba(1)-O(14) bond length. There is one shorter (2.91 Å) and one longer (2.98 Å) Ba(1)-O(4) bond length. Ce(1) is bonded in a 7-coordinate geometry to one O(11), one O(12), one O(13), one O(5), one O(6), and two equivalent O(3) atoms. The Ce(1)-O(11) bond length is 2.52 Å. The Ce(1)-O(12) bond length is 2.46 Å. The Ce(1)-O(13) bond length is 2.47 Å. The Ce(1)-O(5) bond length is 2.28 Å. The Ce(1)-O(6) bond length is 2.53 Å. There is one shorter (2.40 Å) and one longer (2.77 Å) Ce(1)-O(3) bond length. Ti(1) is bonded to one O(1), one O(11), one O(12), one O(14), one O(2), and one O(4) atom to form TiO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and  an edgeedge with one Ti(1)O6 octahedra. The Ti(1)-O(1) bond length is 1.92 Å. The Ti(1)-O(11) bond length is 2.07 Å. The Ti(1)-O(12) bond length is 2.09 Å. The Ti(1)-O(14) bond length is 1.97 Å. The Ti(1)-O(2) bond length is 1.93 Å. The Ti(1)-O(4) bond length is 1.99 Å. Fe(1) is bonded in a distorted see-saw-like geometry to two equivalent O(13) and two equivalent O(6) atoms. Both Fe(1)-O(13) bond lengths are 1.96 Å. Both Fe(1)-O(6) bond lengths are 2.04 Å. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(14), one O(3), one O(7), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Si(3)O4 tetrahedra, and  a cornercorner with one Si(4)O4 tetrahedra. The corner-sharing octahedral tilt angles are 46°. The Si(1)-O(14) bond length is 1.63 Å. The Si(1)-O(3) bond length is 1.61 Å. The Si(1)-O(7) bond length is 1.68 Å. The Si(1)-O(8) bond length is 1.67 Å. In the second Si site, Si(2) is bonded to one O(10), one O(13), one O(4), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Si(3)O4 tetrahedra, and  a cornercorner with one Si(4)O4 tetrahedra. The corner-sharing octahedral tilt angles are 47°. The Si(2)-O(10) bond length is 1.66 Å. The Si(2)-O(13) bond length is 1.61 Å. The Si(2)-O(4) bond length is 1.62 Å. The Si(2)-O(9) bond length is 1.67 Å. In the third Si site, Si(3) is bonded to one O(10), one O(11), one O(5), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, and  a cornercorner with one Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 41°. The Si(3)-O(10) bond length is 1.68 Å. The Si(3)-O(11) bond length is 1.63 Å. The Si(3)-O(5) bond length is 1.60 Å. The Si(3)-O(7) bond length is 1.68 Å. In the fourth Si site, Si(4) is bonded to one O(12), one O(6), one O(8), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, and  a cornercorner with one Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 43°. The Si(4)-O(12) bond length is 1.62 Å. The Si(4)-O(6) bond length is 1.63 Å. The Si(4)-O(8) bond length is 1.66 Å. The Si(4)-O(9) bond length is 1.67 Å. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted L-shaped geometry to two equivalent Ba(1) and two equivalent Ti(1) atoms. In the second O site, O(2) is bonded in a distorted L-shaped geometry to two equivalent Ba(1) and two equivalent Ti(1) atoms. In the third O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Ce(1) and one Si(1) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to two equivalent Ba(1), one Ti(1), and one Si(2) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Ce(1) and one Si(3) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Ce(1), one Fe(1), and one Si(4) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Ba(1), one Si(1), and one Si(3) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one Ba(1), one Si(1), and one Si(4) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one Ba(1), one Si(2), and one Si(4) atom. In the tenth O site, O(10) is bonded in a 2-coordinate geometry to one Ba(1), one Si(2), and one Si(3) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one Ce(1), one Ti(1), and one Si(3) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to one Ce(1), one Ti(1), and one Si(4) atom. In the thirteenth O site, O(13) is bonded in a 3-coordinate geometry to one Ce(1), one Fe(1), and one Si(2) atom. In the fourteenth O site, O(14) is bonded in a 2-coordinate geometry to two equivalent Ba(1), one Ti(1), and one Si(1) atom.