The structure described by NaTb(SiO3)2 crystallizes in the triclinic P-1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 4-coordinate geometry to two equivalent Si(3) and two equivalent O(9) atoms. In the second Na site, Na(2) is bonded in a single-bond geometry to one O(2) atom. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a distorted linear geometry to two equivalent O(4) and two equivalent O(6) atoms. In the second Tb site, Tb(2) is bonded in a 3-coordinate geometry to one O(8) and two equivalent O(5) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a distorted single-bond geometry to one O(1), one O(2), and one O(3) atom. In the second Si site, Si(2) is bonded in a 3-coordinate geometry to one O(3), one O(4), one O(5), and one O(6) atom. In the third Si site, Si(3) is bonded in a 2-coordinate geometry to one Na(1), one O(6), one O(7), and one O(8) atom. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one Si(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Na(2) and one Si(1) atom. In the third O site, O(3) is bonded in a distorted water-like geometry to one Si(1), one Si(2), and one O(6) atom. In the fourth O site, O(4) is bonded in a distorted L-shaped geometry to one Tb(1) and one Si(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to two equivalent Tb(2) and one Si(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Tb(1), one Si(2), one Si(3), and one O(3) atom. In the seventh O site, O(7) is bonded in a single-bond geometry to one Si(3) atom. In the eighth O site, O(8) is bonded in a distorted water-like geometry to one Tb(2) and one Si(3) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one Na(1) atom. is represented by the CIF card [CIF]
data_NaTb(SiO3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.550
_cell_length_b   9.475
_cell_length_c   9.810
_cell_angle_alpha   117.234
_cell_angle_beta   97.247
_cell_angle_gamma   99.823
_symmetry_Int_Tables_number   1
_cell_volume   439.440
_cell_formula_units_Z   3
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
  Na  Na0  1  0.000  0.000  0.000  1.0
  Na  Na1  1  0.239  0.667  0.932  1.0
  Na  Na2  1  0.761  0.333  0.068  1.0
  Tb  Tb3  1  0.500  0.000  0.500  1.0
  Tb  Tb4  1  0.958  0.418  0.361  1.0
  Tb  Tb5  1  0.042  0.582  0.639  1.0
  Si  Si6  1  0.651  0.643  0.124  1.0
  Si  Si7  1  0.349  0.357  0.876  1.0
  Si  Si8  1  0.265  0.249  0.629  1.0
  Si  Si9  1  0.735  0.751  0.371  1.0
  Si  Si10  1  0.862  0.890  0.748  1.0
  Si  Si11  1  0.138  0.110  0.252  1.0
  O  O12  1  0.346  0.566  0.159  1.0
  O  O13  1  0.654  0.434  0.841  1.0
  O  O14  1  0.819  0.518  0.162  1.0
  O  O15  1  0.181  0.482  0.838  1.0
  O  O16  1  0.691  0.756  0.212  1.0
  O  O17  1  0.309  0.244  0.788  1.0
  O  O18  1  0.527  0.244  0.513  1.0
  O  O19  1  0.473  0.756  0.487  1.0
  O  O20  1  0.148  0.396  0.551  1.0
  O  O21  1  0.852  0.604  0.449  1.0
  O  O22  1  0.037  0.073  0.703  1.0
  O  O23  1  0.963  0.927  0.297  1.0
  O  O24  1  0.589  0.888  0.721  1.0
  O  O25  1  0.411  0.112  0.279  1.0
  O  O26  1  0.060  0.824  0.650  1.0
  O  O27  1  0.940  0.176  0.350  1.0
  O  O28  1  0.817  0.787  0.937  1.0
  O  O29  1  0.183  0.213  0.063  1.0
[/CIF]
.
The structure described by NaTb(SiO3)2 crystallizes in the triclinic P-1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 4-coordinate geometry to two equivalent Si(3) and two equivalent O(9) atoms. In the second Na site, Na(2) is bonded in a single-bond geometry to one O(2) atom. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a distorted linear geometry to two equivalent O(4) and two equivalent O(6) atoms. In the second Tb site, Tb(2) is bonded in a 3-coordinate geometry to one O(8) and two equivalent O(5) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a distorted single-bond geometry to one O(1), one O(2), and one O(3) atom. In the second Si site, Si(2) is bonded in a 3-coordinate geometry to one O(3), one O(4), one O(5), and one O(6) atom. In the third Si site, Si(3) is bonded in a 2-coordinate geometry to one Na(1), one O(6), one O(7), and one O(8) atom. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one Si(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Na(2) and one Si(1) atom. In the third O site, O(3) is bonded in a distorted water-like geometry to one Si(1), one Si(2), and one O(6) atom. In the fourth O site, O(4) is bonded in a distorted L-shaped geometry to one Tb(1) and one Si(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to two equivalent Tb(2) and one Si(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Tb(1), one Si(2), one Si(3), and one O(3) atom. In the seventh O site, O(7) is bonded in a single-bond geometry to one Si(3) atom. In the eighth O site, O(8) is bonded in a distorted water-like geometry to one Tb(2) and one Si(3) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one Na(1) atom. is represented by the CIF card [CIF]
data_NaTb(SiO3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.550
_cell_length_b   9.475
_cell_length_c   9.810
_cell_angle_alpha   117.234
_cell_angle_beta   97.247
_cell_angle_gamma   99.823
_symmetry_Int_Tables_number   1
_cell_volume   439.440
_cell_formula_units_Z   3
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
  Na  Na0  1  0.000  0.000  0.000  1.0
  Na  Na1  1  0.239  0.667  0.932  1.0
  Na  Na2  1  0.761  0.333  0.068  1.0
  Tb  Tb3  1  0.500  0.000  0.500  1.0
  Tb  Tb4  1  0.958  0.418  0.361  1.0
  Tb  Tb5  1  0.042  0.582  0.639  1.0
  Si  Si6  1  0.651  0.643  0.124  1.0
  Si  Si7  1  0.349  0.357  0.876  1.0
  Si  Si8  1  0.265  0.249  0.629  1.0
  Si  Si9  1  0.735  0.751  0.371  1.0
  Si  Si10  1  0.862  0.890  0.748  1.0
  Si  Si11  1  0.138  0.110  0.252  1.0
  O  O12  1  0.346  0.566  0.159  1.0
  O  O13  1  0.654  0.434  0.841  1.0
  O  O14  1  0.819  0.518  0.162  1.0
  O  O15  1  0.181  0.482  0.838  1.0
  O  O16  1  0.691  0.756  0.212  1.0
  O  O17  1  0.309  0.244  0.788  1.0
  O  O18  1  0.527  0.244  0.513  1.0
  O  O19  1  0.473  0.756  0.487  1.0
  O  O20  1  0.148  0.396  0.551  1.0
  O  O21  1  0.852  0.604  0.449  1.0
  O  O22  1  0.037  0.073  0.703  1.0
  O  O23  1  0.963  0.927  0.297  1.0
  O  O24  1  0.589  0.888  0.721  1.0
  O  O25  1  0.411  0.112  0.279  1.0
  O  O26  1  0.060  0.824  0.650  1.0
  O  O27  1  0.940  0.176  0.350  1.0
  O  O28  1  0.817  0.787  0.937  1.0
  O  O29  1  0.183  0.213  0.063  1.0
[/CIF]
.