The structure described by Tm3B3O7 crystallizes in the orthorhombic Amm2 space group. There are three inequivalent Tm sites. In the first Tm site, Tm(1) is bonded to one B(1), one O(1), three equivalent O(2), and three equivalent O(6) atoms to form distorted TmBO7 hexagonal bipyramids that share  a cornercorner with one Tm(2)B2O6 hexagonal bipyramid,  a cornercorner with one Tm(3)BO7 hexagonal bipyramid, and edges with six equivalent Tm(1)BO7 hexagonal bipyramids. In the second Tm site, Tm(2) is bonded to one B(1), one B(3), three equivalent O(3), and three equivalent O(5) atoms to form distorted TmB2O6 hexagonal bipyramids that share  a cornercorner with one Tm(2)B2O6 hexagonal bipyramid,  a cornercorner with one Tm(1)BO7 hexagonal bipyramid, and edges with six equivalent Tm(2)B2O6 hexagonal bipyramids. In the third Tm site, Tm(3) is bonded to one B(2), one O(1), three equivalent O(4), and three equivalent O(7) atoms to form a mixture of distorted corner and edge-sharing TmBO7 hexagonal bipyramids. There are four inequivalent B sites. In the first B site, B(1) is bonded in a bent 120 degrees geometry to one Tm(1), one Tm(2), one O(2), and one O(3) atom. In the second B site, B(2) is bonded in a bent 120 degrees geometry to two equivalent Tm(3) and two equivalent O(4) atoms. In the third B site, B(3) is bonded in a bent 120 degrees geometry to two equivalent Tm(2) and two equivalent O(5) atoms. In the fourth B site, B(4) is bonded in a 4-coordinate geometry to one O(6), one O(7), and two equivalent O(1) atoms. There are seven inequivalent O sites. In the first O site, O(5) is bonded in a 4-coordinate geometry to three equivalent Tm(2) and one B(3) atom. In the second O site, O(6) is bonded in a distorted single-bond geometry to three equivalent Tm(1) and one B(4) atom. In the third O site, O(7) is bonded in a distorted single-bond geometry to three equivalent Tm(3) and one B(4) atom. In the fourth O site, O(1) is bonded in a see-saw-like geometry to one Tm(1), one Tm(3), and two equivalent B(4) atoms. In the fifth O site, O(2) is bonded in a 4-coordinate geometry to three equivalent Tm(1) and one B(1) atom. In the sixth O site, O(3) is bonded in a 4-coordinate geometry to three equivalent Tm(2) and one B(1) atom. In the seventh O site, O(4) is bonded in a 4-coordinate geometry to three equivalent Tm(3) and one B(2) atom. is represented by the CIF file [CIF]
data_Tm3B3O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.943
_cell_length_b   3.943
_cell_length_c   24.907
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   124.271
_symmetry_Int_Tables_number   1
_cell_volume   319.987
_cell_formula_units_Z   2
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
  Tm  Tm0  1  0.005  0.995  0.004  1.0
  Tm  Tm1  1  0.000  1.000  0.168  1.0
  Tm  Tm2  1  0.000  1.000  0.332  1.0
  Tm  Tm3  1  0.005  0.995  0.496  1.0
  Tm  Tm4  1  0.011  0.989  0.668  1.0
  Tm  Tm5  1  0.011  0.989  0.832  1.0
  B  B6  1  0.243  0.757  0.086  1.0
  B  B7  1  0.243  0.757  0.414  1.0
  B  B8  1  0.253  0.747  0.750  1.0
  B  B9  1  0.760  0.240  0.250  1.0
  B  B10  1  0.641  0.359  0.918  1.0
  B  B11  1  0.641  0.359  0.582  1.0
  O  O12  1  0.027  0.973  0.918  1.0
  O  O13  1  0.349  0.651  0.038  1.0
  O  O14  1  0.340  0.660  0.365  1.0
  O  O15  1  0.355  0.645  0.702  1.0
  O  O16  1  0.340  0.660  0.135  1.0
  O  O17  1  0.349  0.651  0.462  1.0
  O  O18  1  0.355  0.645  0.798  1.0
  O  O19  1  0.027  0.973  0.582  1.0
  O  O20  1  0.660  0.340  0.298  1.0
  O  O21  1  0.660  0.340  0.202  1.0
  O  O22  1  0.680  0.320  0.529  1.0
  O  O23  1  0.682  0.318  0.865  1.0
  O  O24  1  0.682  0.318  0.635  1.0
  O  O25  1  0.680  0.320  0.971  1.0
[/CIF]
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The structure described by Tm3B3O7 crystallizes in the orthorhombic Amm2 space group. There are three inequivalent Tm sites. In the first Tm site, Tm(1) is bonded to one B(1), one O(1), three equivalent O(2), and three equivalent O(6) atoms to form distorted TmBO7 hexagonal bipyramids that share  a cornercorner with one Tm(2)B2O6 hexagonal bipyramid,  a cornercorner with one Tm(3)BO7 hexagonal bipyramid, and edges with six equivalent Tm(1)BO7 hexagonal bipyramids. In the second Tm site, Tm(2) is bonded to one B(1), one B(3), three equivalent O(3), and three equivalent O(5) atoms to form distorted TmB2O6 hexagonal bipyramids that share  a cornercorner with one Tm(2)B2O6 hexagonal bipyramid,  a cornercorner with one Tm(1)BO7 hexagonal bipyramid, and edges with six equivalent Tm(2)B2O6 hexagonal bipyramids. In the third Tm site, Tm(3) is bonded to one B(2), one O(1), three equivalent O(4), and three equivalent O(7) atoms to form a mixture of distorted corner and edge-sharing TmBO7 hexagonal bipyramids. There are four inequivalent B sites. In the first B site, B(1) is bonded in a bent 120 degrees geometry to one Tm(1), one Tm(2), one O(2), and one O(3) atom. In the second B site, B(2) is bonded in a bent 120 degrees geometry to two equivalent Tm(3) and two equivalent O(4) atoms. In the third B site, B(3) is bonded in a bent 120 degrees geometry to two equivalent Tm(2) and two equivalent O(5) atoms. In the fourth B site, B(4) is bonded in a 4-coordinate geometry to one O(6), one O(7), and two equivalent O(1) atoms. There are seven inequivalent O sites. In the first O site, O(5) is bonded in a 4-coordinate geometry to three equivalent Tm(2) and one B(3) atom. In the second O site, O(6) is bonded in a distorted single-bond geometry to three equivalent Tm(1) and one B(4) atom. In the third O site, O(7) is bonded in a distorted single-bond geometry to three equivalent Tm(3) and one B(4) atom. In the fourth O site, O(1) is bonded in a see-saw-like geometry to one Tm(1), one Tm(3), and two equivalent B(4) atoms. In the fifth O site, O(2) is bonded in a 4-coordinate geometry to three equivalent Tm(1) and one B(1) atom. In the sixth O site, O(3) is bonded in a 4-coordinate geometry to three equivalent Tm(2) and one B(1) atom. In the seventh O site, O(4) is bonded in a 4-coordinate geometry to three equivalent Tm(3) and one B(2) atom. is represented by the CIF file [CIF]
data_Tm3B3O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.943
_cell_length_b   3.943
_cell_length_c   24.907
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   124.271
_symmetry_Int_Tables_number   1
_cell_volume   319.987
_cell_formula_units_Z   2
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
  Tm  Tm0  1  0.005  0.995  0.004  1.0
  Tm  Tm1  1  0.000  1.000  0.168  1.0
  Tm  Tm2  1  0.000  1.000  0.332  1.0
  Tm  Tm3  1  0.005  0.995  0.496  1.0
  Tm  Tm4  1  0.011  0.989  0.668  1.0
  Tm  Tm5  1  0.011  0.989  0.832  1.0
  B  B6  1  0.243  0.757  0.086  1.0
  B  B7  1  0.243  0.757  0.414  1.0
  B  B8  1  0.253  0.747  0.750  1.0
  B  B9  1  0.760  0.240  0.250  1.0
  B  B10  1  0.641  0.359  0.918  1.0
  B  B11  1  0.641  0.359  0.582  1.0
  O  O12  1  0.027  0.973  0.918  1.0
  O  O13  1  0.349  0.651  0.038  1.0
  O  O14  1  0.340  0.660  0.365  1.0
  O  O15  1  0.355  0.645  0.702  1.0
  O  O16  1  0.340  0.660  0.135  1.0
  O  O17  1  0.349  0.651  0.462  1.0
  O  O18  1  0.355  0.645  0.798  1.0
  O  O19  1  0.027  0.973  0.582  1.0
  O  O20  1  0.660  0.340  0.298  1.0
  O  O21  1  0.660  0.340  0.202  1.0
  O  O22  1  0.680  0.320  0.529  1.0
  O  O23  1  0.682  0.318  0.865  1.0
  O  O24  1  0.682  0.318  0.635  1.0
  O  O25  1  0.680  0.320  0.971  1.0
[/CIF]
.