The structure described by Sm2TiO5 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to one O(1), one O(3), one O(4), two equivalent O(2), and two equivalent O(5) atoms to form distorted SmO7 hexagonal pyramids that share corners with two equivalent Sm(2)O7 hexagonal pyramids, corners with three equivalent Ti(1)O5 trigonal bipyramids, edges with two equivalent Sm(1)O7 hexagonal pyramids, edges with three equivalent Sm(2)O7 hexagonal pyramids, and edges with two equivalent Ti(1)O5 trigonal bipyramids. In the second Sm site, Sm(2) is bonded to one O(4), one O(5), two equivalent O(3), and three equivalent O(1) atoms to form distorted SmO7 hexagonal pyramids that share corners with two equivalent Sm(1)O7 hexagonal pyramids,  a cornercorner with one Ti(1)O5 trigonal bipyramid, edges with three equivalent Sm(1)O7 hexagonal pyramids, edges with four equivalent Sm(2)O7 hexagonal pyramids, and edges with two equivalent Ti(1)O5 trigonal bipyramids. Ti(1) is bonded to one O(2), one O(3), one O(5), and two equivalent O(4) atoms to form distorted TiO5 trigonal bipyramids that share  a cornercorner with one Sm(2)O7 hexagonal pyramid, corners with three equivalent Sm(1)O7 hexagonal pyramids, corners with two equivalent Ti(1)O5 trigonal bipyramids, edges with two equivalent Sm(1)O7 hexagonal pyramids, and edges with two equivalent Sm(2)O7 hexagonal pyramids. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Sm(1) and three equivalent Sm(2) atoms to form OSm4 tetrahedra that share corners with two equivalent O(4)Sm2Ti2 tetrahedra, corners with two equivalent O(1)Sm4 tetrahedra, corners with five equivalent O(3)Sm3Ti tetrahedra, corners with five equivalent O(5)Sm3Ti tetrahedra,  an edgeedge with one O(4)Sm2Ti2 tetrahedra,  an edgeedge with one O(3)Sm3Ti tetrahedra, and edges with two equivalent O(1)Sm4 tetrahedra. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Sm(1) and one Ti(1) atom. In the third O site, O(3) is bonded to one Sm(1), two equivalent Sm(2), and one Ti(1) atom to form distorted OSm3Ti tetrahedra that share  a cornercorner with one O(4)Sm2Ti2 tetrahedra,  a cornercorner with one O(5)Sm3Ti tetrahedra, corners with two equivalent O(3)Sm3Ti tetrahedra, corners with five equivalent O(1)Sm4 tetrahedra,  an edgeedge with one O(1)Sm4 tetrahedra, edges with two equivalent O(4)Sm2Ti2 tetrahedra, and edges with two equivalent O(5)Sm3Ti tetrahedra. In the fourth O site, O(4) is bonded to one Sm(1), one Sm(2), and two equivalent Ti(1) atoms to form distorted OSm2Ti2 tetrahedra that share  a cornercorner with one O(3)Sm3Ti tetrahedra,  a cornercorner with one O(5)Sm3Ti tetrahedra, corners with two equivalent O(4)Sm2Ti2 tetrahedra, corners with two equivalent O(1)Sm4 tetrahedra,  an edgeedge with one O(1)Sm4 tetrahedra, edges with two equivalent O(3)Sm3Ti tetrahedra, and edges with two equivalent O(5)Sm3Ti tetrahedra. In the fifth O site, O(5) is bonded to one Sm(2), two equivalent Sm(1), and one Ti(1) atom to form OSm3Ti tetrahedra that share  a cornercorner with one O(4)Sm2Ti2 tetrahedra,  a cornercorner with one O(3)Sm3Ti tetrahedra, corners with two equivalent O(5)Sm3Ti tetrahedra, corners with five equivalent O(1)Sm4 tetrahedra, edges with two equivalent O(4)Sm2Ti2 tetrahedra, and edges with two equivalent O(3)Sm3Ti tetrahedra. is represented by the CIF file [CIF]
data_Sm2TiO5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.783
_cell_length_b   10.599
_cell_length_c   11.401
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   457.102
_cell_formula_units_Z   4
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Sm  Sm0  1  0.250  0.109  0.278  1.0
  Sm  Sm1  1  0.250  0.137  0.943  1.0
  Sm  Sm2  1  0.750  0.363  0.443  1.0
  Sm  Sm3  1  0.750  0.391  0.778  1.0
  Sm  Sm4  1  0.250  0.609  0.222  1.0
  Sm  Sm5  1  0.250  0.637  0.557  1.0
  Sm  Sm6  1  0.750  0.863  0.057  1.0
  Sm  Sm7  1  0.750  0.891  0.722  1.0
  Ti  Ti8  1  0.250  0.179  0.622  1.0
  Ti  Ti9  1  0.750  0.321  0.122  1.0
  Ti  Ti10  1  0.250  0.679  0.878  1.0
  Ti  Ti11  1  0.750  0.821  0.378  1.0
  O  O12  1  0.750  0.008  0.896  1.0
  O  O13  1  0.250  0.016  0.657  1.0
  O  O14  1  0.250  0.223  0.461  1.0
  O  O15  1  0.750  0.236  0.619  1.0
  O  O16  1  0.750  0.237  0.270  1.0
  O  O17  1  0.250  0.263  0.770  1.0
  O  O18  1  0.250  0.264  0.119  1.0
  O  O19  1  0.750  0.277  0.961  1.0
  O  O20  1  0.750  0.484  0.157  1.0
  O  O21  1  0.250  0.492  0.396  1.0
  O  O22  1  0.750  0.508  0.604  1.0
  O  O23  1  0.250  0.516  0.843  1.0
  O  O24  1  0.250  0.723  0.039  1.0
  O  O25  1  0.750  0.736  0.881  1.0
  O  O26  1  0.750  0.737  0.230  1.0
  O  O27  1  0.250  0.763  0.730  1.0
  O  O28  1  0.250  0.764  0.381  1.0
  O  O29  1  0.750  0.777  0.539  1.0
  O  O30  1  0.750  0.984  0.343  1.0
  O  O31  1  0.250  0.992  0.104  1.0
[/CIF]
.
The structure described by Sm2TiO5 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to one O(1), one O(3), one O(4), two equivalent O(2), and two equivalent O(5) atoms to form distorted SmO7 hexagonal pyramids that share corners with two equivalent Sm(2)O7 hexagonal pyramids, corners with three equivalent Ti(1)O5 trigonal bipyramids, edges with two equivalent Sm(1)O7 hexagonal pyramids, edges with three equivalent Sm(2)O7 hexagonal pyramids, and edges with two equivalent Ti(1)O5 trigonal bipyramids. In the second Sm site, Sm(2) is bonded to one O(4), one O(5), two equivalent O(3), and three equivalent O(1) atoms to form distorted SmO7 hexagonal pyramids that share corners with two equivalent Sm(1)O7 hexagonal pyramids,  a cornercorner with one Ti(1)O5 trigonal bipyramid, edges with three equivalent Sm(1)O7 hexagonal pyramids, edges with four equivalent Sm(2)O7 hexagonal pyramids, and edges with two equivalent Ti(1)O5 trigonal bipyramids. Ti(1) is bonded to one O(2), one O(3), one O(5), and two equivalent O(4) atoms to form distorted TiO5 trigonal bipyramids that share  a cornercorner with one Sm(2)O7 hexagonal pyramid, corners with three equivalent Sm(1)O7 hexagonal pyramids, corners with two equivalent Ti(1)O5 trigonal bipyramids, edges with two equivalent Sm(1)O7 hexagonal pyramids, and edges with two equivalent Sm(2)O7 hexagonal pyramids. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Sm(1) and three equivalent Sm(2) atoms to form OSm4 tetrahedra that share corners with two equivalent O(4)Sm2Ti2 tetrahedra, corners with two equivalent O(1)Sm4 tetrahedra, corners with five equivalent O(3)Sm3Ti tetrahedra, corners with five equivalent O(5)Sm3Ti tetrahedra,  an edgeedge with one O(4)Sm2Ti2 tetrahedra,  an edgeedge with one O(3)Sm3Ti tetrahedra, and edges with two equivalent O(1)Sm4 tetrahedra. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Sm(1) and one Ti(1) atom. In the third O site, O(3) is bonded to one Sm(1), two equivalent Sm(2), and one Ti(1) atom to form distorted OSm3Ti tetrahedra that share  a cornercorner with one O(4)Sm2Ti2 tetrahedra,  a cornercorner with one O(5)Sm3Ti tetrahedra, corners with two equivalent O(3)Sm3Ti tetrahedra, corners with five equivalent O(1)Sm4 tetrahedra,  an edgeedge with one O(1)Sm4 tetrahedra, edges with two equivalent O(4)Sm2Ti2 tetrahedra, and edges with two equivalent O(5)Sm3Ti tetrahedra. In the fourth O site, O(4) is bonded to one Sm(1), one Sm(2), and two equivalent Ti(1) atoms to form distorted OSm2Ti2 tetrahedra that share  a cornercorner with one O(3)Sm3Ti tetrahedra,  a cornercorner with one O(5)Sm3Ti tetrahedra, corners with two equivalent O(4)Sm2Ti2 tetrahedra, corners with two equivalent O(1)Sm4 tetrahedra,  an edgeedge with one O(1)Sm4 tetrahedra, edges with two equivalent O(3)Sm3Ti tetrahedra, and edges with two equivalent O(5)Sm3Ti tetrahedra. In the fifth O site, O(5) is bonded to one Sm(2), two equivalent Sm(1), and one Ti(1) atom to form OSm3Ti tetrahedra that share  a cornercorner with one O(4)Sm2Ti2 tetrahedra,  a cornercorner with one O(3)Sm3Ti tetrahedra, corners with two equivalent O(5)Sm3Ti tetrahedra, corners with five equivalent O(1)Sm4 tetrahedra, edges with two equivalent O(4)Sm2Ti2 tetrahedra, and edges with two equivalent O(3)Sm3Ti tetrahedra. is represented by the CIF file [CIF]
data_Sm2TiO5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.783
_cell_length_b   10.599
_cell_length_c   11.401
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   457.102
_cell_formula_units_Z   4
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Sm  Sm0  1  0.250  0.109  0.278  1.0
  Sm  Sm1  1  0.250  0.137  0.943  1.0
  Sm  Sm2  1  0.750  0.363  0.443  1.0
  Sm  Sm3  1  0.750  0.391  0.778  1.0
  Sm  Sm4  1  0.250  0.609  0.222  1.0
  Sm  Sm5  1  0.250  0.637  0.557  1.0
  Sm  Sm6  1  0.750  0.863  0.057  1.0
  Sm  Sm7  1  0.750  0.891  0.722  1.0
  Ti  Ti8  1  0.250  0.179  0.622  1.0
  Ti  Ti9  1  0.750  0.321  0.122  1.0
  Ti  Ti10  1  0.250  0.679  0.878  1.0
  Ti  Ti11  1  0.750  0.821  0.378  1.0
  O  O12  1  0.750  0.008  0.896  1.0
  O  O13  1  0.250  0.016  0.657  1.0
  O  O14  1  0.250  0.223  0.461  1.0
  O  O15  1  0.750  0.236  0.619  1.0
  O  O16  1  0.750  0.237  0.270  1.0
  O  O17  1  0.250  0.263  0.770  1.0
  O  O18  1  0.250  0.264  0.119  1.0
  O  O19  1  0.750  0.277  0.961  1.0
  O  O20  1  0.750  0.484  0.157  1.0
  O  O21  1  0.250  0.492  0.396  1.0
  O  O22  1  0.750  0.508  0.604  1.0
  O  O23  1  0.250  0.516  0.843  1.0
  O  O24  1  0.250  0.723  0.039  1.0
  O  O25  1  0.750  0.736  0.881  1.0
  O  O26  1  0.750  0.737  0.230  1.0
  O  O27  1  0.250  0.763  0.730  1.0
  O  O28  1  0.250  0.764  0.381  1.0
  O  O29  1  0.750  0.777  0.539  1.0
  O  O30  1  0.750  0.984  0.343  1.0
  O  O31  1  0.250  0.992  0.104  1.0
[/CIF]
.