The material described by Er2(NiAl)5 crystallizes in the monoclinic Pm space group. There are six inequivalent Er sites. In the first Er site, Er(1) is bonded in a 18-coordinate geometry to one Ni(13), one Ni(15), two equivalent Ni(1), two equivalent Ni(3), two equivalent Ni(5), one Al(11), one Al(12), one Al(14), one Al(8), two equivalent Al(2), two equivalent Al(3), and two equivalent Al(5) atoms. In the second Er site, Er(2) is bonded in a 18-coordinate geometry to one Ni(14), two equivalent Ni(2), two equivalent Ni(4), two equivalent Ni(6), one Al(10), one Al(13), one Al(15), one Al(7), one Al(9), two equivalent Al(1), two equivalent Al(4), and two equivalent Al(6) atoms. In the third Er site, Er(3) is bonded in a 18-coordinate geometry to one Ni(14), one Ni(15), two equivalent Ni(11), two equivalent Ni(7), two equivalent Ni(9), one Al(10), one Al(12), one Al(14), one Al(8), two equivalent Al(1), two equivalent Al(3), and two equivalent Al(5) atoms. In the fourth Er site, Er(4) is bonded in a 18-coordinate geometry to one Ni(13), two equivalent Ni(10), two equivalent Ni(12), two equivalent Ni(8), one Al(11), one Al(13), one Al(15), one Al(7), one Al(9), two equivalent Al(2), two equivalent Al(4), and two equivalent Al(6) atoms. In the fifth Er site, Er(5) is bonded in a distorted hexagonal planar geometry to one Ni(1), one Ni(11), one Ni(4), one Ni(6), one Ni(8), one Ni(9), and two equivalent Ni(14) atoms. In the sixth Er site, Er(6) is bonded in a distorted hexagonal planar geometry to one Ni(10), one Ni(12), one Ni(2), one Ni(3), one Ni(5), one Ni(7), two equivalent Ni(13), and two equivalent Ni(15) atoms. There are fifteen inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 9-coordinate geometry to one Er(5), two equivalent Er(1), one Al(3), one Al(5), two equivalent Al(12), and two equivalent Al(8) atoms. In the second Ni site, Ni(2) is bonded in a 9-coordinate geometry to one Er(6), two equivalent Er(2), one Al(4), one Al(6), two equivalent Al(13), and two equivalent Al(9) atoms. In the third Ni site, Ni(3) is bonded in a 9-coordinate geometry to one Er(6), two equivalent Er(1), two equivalent Ni(13), one Al(2), one Al(5), and two equivalent Al(14) atoms. In the fourth Ni site, Ni(4) is bonded in a 9-coordinate geometry to one Er(5), two equivalent Er(2), two equivalent Ni(14), one Al(1), one Al(6), and two equivalent Al(15) atoms. In the fifth Ni site, Ni(5) is bonded in a 9-coordinate geometry to one Er(6), two equivalent Er(1), two equivalent Ni(15), one Al(2), one Al(3), and two equivalent Al(11) atoms. In the sixth Ni site, Ni(6) is bonded in a 9-coordinate geometry to one Er(5), two equivalent Er(2), one Al(1), one Al(4), two equivalent Al(10), and two equivalent Al(7) atoms. In the seventh Ni site, Ni(7) is bonded in a 9-coordinate geometry to one Er(6), two equivalent Er(3), two equivalent Ni(15), one Al(3), one Al(5), and two equivalent Al(14) atoms. In the eighth Ni site, Ni(8) is bonded in a 9-coordinate geometry to one Er(5), two equivalent Er(4), one Al(4), one Al(6), two equivalent Al(15), and two equivalent Al(7) atoms. In the ninth Ni site, Ni(9) is bonded in a 9-coordinate geometry to one Er(5), two equivalent Er(3), two equivalent Ni(14), one Al(1), one Al(3), and two equivalent Al(12) atoms. In the tenth Ni site, Ni(10) is bonded in a 9-coordinate geometry to one Er(6), two equivalent Er(4), two equivalent Ni(13), one Al(2), one Al(4), and two equivalent Al(13) atoms. In the eleventh Ni site, Ni(11) is bonded in a 9-coordinate geometry to one Er(5), two equivalent Er(3), one Al(1), one Al(5), two equivalent Al(10), and two equivalent Al(8) atoms. In the twelfth Ni site, Ni(12) is bonded in a 9-coordinate geometry to one Er(6), two equivalent Er(4), one Al(2), one Al(6), two equivalent Al(11), and two equivalent Al(9) atoms. In the thirteenth Ni site, Ni(13) is bonded in a 12-coordinate geometry to one Er(1), one Er(4), two equivalent Er(6), two equivalent Ni(10), two equivalent Ni(3), one Al(13), one Al(14), and two equivalent Al(2) atoms. In the fourteenth Ni site, Ni(14) is bonded in a 12-coordinate geometry to one Er(2), one Er(3), two equivalent Er(5), two equivalent Ni(4), two equivalent Ni(9), one Al(12), one Al(15), and two equivalent Al(1) atoms. In the fifteenth Ni site, Ni(15) is bonded in a 12-coordinate geometry to one Er(1), one Er(3), two equivalent Er(6), two equivalent Ni(5), two equivalent Ni(7), one Al(11), one Al(14), and two equivalent Al(3) atoms. There are fifteen inequivalent Al sites. In the first Al site, Al(1) is bonded in a 6-coordinate geometry to two equivalent Er(2), two equivalent Er(3), one Ni(11), one Ni(4), one Ni(6), one Ni(9), and two equivalent Ni(14) atoms. In the second Al site, Al(2) is bonded in a 6-coordinate geometry to two equivalent Er(1), two equivalent Er(4), one Ni(10), one Ni(12), one Ni(3), one Ni(5), and two equivalent Ni(13) atoms. In the third Al site, Al(3) is bonded in a 6-coordinate geometry to two equivalent Er(1), two equivalent Er(3), one Ni(1), one Ni(5), one Ni(7), one Ni(9), and two equivalent Ni(15) atoms. In the fourth Al site, Al(4) is bonded in a 4-coordinate geometry to two equivalent Er(2), two equivalent Er(4), one Ni(10), one Ni(2), one Ni(6), and one Ni(8) atom. In the fifth Al site, Al(5) is bonded in a 4-coordinate geometry to two equivalent Er(1), two equivalent Er(3), one Ni(1), one Ni(11), one Ni(3), and one Ni(7) atom. In the sixth Al site, Al(6) is bonded in a 4-coordinate geometry to two equivalent Er(2), two equivalent Er(4), one Ni(12), one Ni(2), one Ni(4), and one Ni(8) atom. In the seventh Al site, Al(7) is bonded in a 4-coordinate geometry to one Er(2), one Er(4), two equivalent Ni(6), and two equivalent Ni(8) atoms. In the eighth Al site, Al(8) is bonded in a 4-coordinate geometry to one Er(1), one Er(3), two equivalent Ni(1), and two equivalent Ni(11) atoms. In the ninth Al site, Al(9) is bonded in a 4-coordinate geometry to one Er(2), one Er(4), two equivalent Ni(12), and two equivalent Ni(2) atoms. In the tenth Al site, Al(10) is bonded in a 4-coordinate geometry to one Er(2), one Er(3), two equivalent Ni(11), and two equivalent Ni(6) atoms. In the eleventh Al site, Al(11) is bonded in a 5-coordinate geometry to one Er(1), one Er(4), one Ni(15), two equivalent Ni(12), and two equivalent Ni(5) atoms. In the twelfth Al site, Al(12) is bonded in a 5-coordinate geometry to one Er(1), one Er(3), one Ni(14), two equivalent Ni(1), and two equivalent Ni(9) atoms. In the thirteenth Al site, Al(13) is bonded in a 5-coordinate geometry to one Er(2), one Er(4), one Ni(13), two equivalent Ni(10), and two equivalent Ni(2) atoms. In the fourteenth Al site, Al(14) is bonded in a 6-coordinate geometry to one Er(1), one Er(3), one Ni(13), one Ni(15), two equivalent Ni(3), and two equivalent Ni(7) atoms. In the fifteenth Al site, Al(15) is bonded in a 5-coordinate geometry to one Er(2), one Er(4), one Ni(14), two equivalent Ni(4), and two equivalent Ni(8) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Er2(AlNi)5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.016
_cell_length_b   8.767
_cell_length_c   15.262
_cell_angle_alpha   89.932
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   537.396
_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
  Er  Er0  1  0.000  0.000  0.336  1.0
  Er  Er1  1  0.000  0.504  0.835  1.0
  Er  Er2  1  0.000  0.505  0.170  1.0
  Er  Er3  1  0.000  0.002  0.664  1.0
  Er  Er4  1  0.500  0.994  0.001  1.0
  Er  Er5  1  0.500  0.498  0.497  1.0
  Al  Al6  1  0.500  0.507  0.001  1.0
  Al  Al7  1  0.500  0.009  0.501  1.0
  Al  Al8  1  0.500  0.748  0.255  1.0
  Al  Al9  1  0.500  0.253  0.751  1.0
  Al  Al10  1  0.500  0.248  0.249  1.0
  Al  Al11  1  0.500  0.753  0.748  1.0
  Al  Al12  1  0.000  0.148  0.851  1.0
  Al  Al13  1  0.000  0.148  0.149  1.0
  Al  Al14  1  0.000  0.650  0.649  1.0
  Al  Al15  1  0.000  0.299  0.001  1.0
  Al  Al16  1  0.000  0.783  0.494  1.0
  Al  Al17  1  0.000  0.849  0.142  1.0
  Al  Al18  1  0.000  0.350  0.640  1.0
  Al  Al19  1  0.000  0.360  0.360  1.0
  Al  Al20  1  0.000  0.849  0.859  1.0
  Ni  Ni21  1  0.500  0.995  0.184  1.0
  Ni  Ni22  1  0.500  0.500  0.680  1.0
  Ni  Ni23  1  0.500  0.226  0.405  1.0
  Ni  Ni24  1  0.500  0.727  0.907  1.0
  Ni  Ni25  1  0.500  0.781  0.410  1.0
  Ni  Ni26  1  0.500  0.275  0.910  1.0
  Ni  Ni27  1  0.500  0.496  0.316  1.0
  Ni  Ni28  1  0.500  0.999  0.818  1.0
  Ni  Ni29  1  0.500  0.724  0.096  1.0
  Ni  Ni30  1  0.500  0.228  0.593  1.0
  Ni  Ni31  1  0.500  0.275  0.091  1.0
  Ni  Ni32  1  0.500  0.774  0.588  1.0
  Ni  Ni33  1  0.000  0.198  0.499  1.0
  Ni  Ni34  1  0.000  0.697  0.001  1.0
  Ni  Ni35  1  0.000  0.650  0.349  1.0
[/CIF]
.
The material described by Er2(NiAl)5 crystallizes in the monoclinic Pm space group. There are six inequivalent Er sites. In the first Er site, Er(1) is bonded in a 18-coordinate geometry to one Ni(13), one Ni(15), two equivalent Ni(1), two equivalent Ni(3), two equivalent Ni(5), one Al(11), one Al(12), one Al(14), one Al(8), two equivalent Al(2), two equivalent Al(3), and two equivalent Al(5) atoms. In the second Er site, Er(2) is bonded in a 18-coordinate geometry to one Ni(14), two equivalent Ni(2), two equivalent Ni(4), two equivalent Ni(6), one Al(10), one Al(13), one Al(15), one Al(7), one Al(9), two equivalent Al(1), two equivalent Al(4), and two equivalent Al(6) atoms. In the third Er site, Er(3) is bonded in a 18-coordinate geometry to one Ni(14), one Ni(15), two equivalent Ni(11), two equivalent Ni(7), two equivalent Ni(9), one Al(10), one Al(12), one Al(14), one Al(8), two equivalent Al(1), two equivalent Al(3), and two equivalent Al(5) atoms. In the fourth Er site, Er(4) is bonded in a 18-coordinate geometry to one Ni(13), two equivalent Ni(10), two equivalent Ni(12), two equivalent Ni(8), one Al(11), one Al(13), one Al(15), one Al(7), one Al(9), two equivalent Al(2), two equivalent Al(4), and two equivalent Al(6) atoms. In the fifth Er site, Er(5) is bonded in a distorted hexagonal planar geometry to one Ni(1), one Ni(11), one Ni(4), one Ni(6), one Ni(8), one Ni(9), and two equivalent Ni(14) atoms. In the sixth Er site, Er(6) is bonded in a distorted hexagonal planar geometry to one Ni(10), one Ni(12), one Ni(2), one Ni(3), one Ni(5), one Ni(7), two equivalent Ni(13), and two equivalent Ni(15) atoms. There are fifteen inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 9-coordinate geometry to one Er(5), two equivalent Er(1), one Al(3), one Al(5), two equivalent Al(12), and two equivalent Al(8) atoms. In the second Ni site, Ni(2) is bonded in a 9-coordinate geometry to one Er(6), two equivalent Er(2), one Al(4), one Al(6), two equivalent Al(13), and two equivalent Al(9) atoms. In the third Ni site, Ni(3) is bonded in a 9-coordinate geometry to one Er(6), two equivalent Er(1), two equivalent Ni(13), one Al(2), one Al(5), and two equivalent Al(14) atoms. In the fourth Ni site, Ni(4) is bonded in a 9-coordinate geometry to one Er(5), two equivalent Er(2), two equivalent Ni(14), one Al(1), one Al(6), and two equivalent Al(15) atoms. In the fifth Ni site, Ni(5) is bonded in a 9-coordinate geometry to one Er(6), two equivalent Er(1), two equivalent Ni(15), one Al(2), one Al(3), and two equivalent Al(11) atoms. In the sixth Ni site, Ni(6) is bonded in a 9-coordinate geometry to one Er(5), two equivalent Er(2), one Al(1), one Al(4), two equivalent Al(10), and two equivalent Al(7) atoms. In the seventh Ni site, Ni(7) is bonded in a 9-coordinate geometry to one Er(6), two equivalent Er(3), two equivalent Ni(15), one Al(3), one Al(5), and two equivalent Al(14) atoms. In the eighth Ni site, Ni(8) is bonded in a 9-coordinate geometry to one Er(5), two equivalent Er(4), one Al(4), one Al(6), two equivalent Al(15), and two equivalent Al(7) atoms. In the ninth Ni site, Ni(9) is bonded in a 9-coordinate geometry to one Er(5), two equivalent Er(3), two equivalent Ni(14), one Al(1), one Al(3), and two equivalent Al(12) atoms. In the tenth Ni site, Ni(10) is bonded in a 9-coordinate geometry to one Er(6), two equivalent Er(4), two equivalent Ni(13), one Al(2), one Al(4), and two equivalent Al(13) atoms. In the eleventh Ni site, Ni(11) is bonded in a 9-coordinate geometry to one Er(5), two equivalent Er(3), one Al(1), one Al(5), two equivalent Al(10), and two equivalent Al(8) atoms. In the twelfth Ni site, Ni(12) is bonded in a 9-coordinate geometry to one Er(6), two equivalent Er(4), one Al(2), one Al(6), two equivalent Al(11), and two equivalent Al(9) atoms. In the thirteenth Ni site, Ni(13) is bonded in a 12-coordinate geometry to one Er(1), one Er(4), two equivalent Er(6), two equivalent Ni(10), two equivalent Ni(3), one Al(13), one Al(14), and two equivalent Al(2) atoms. In the fourteenth Ni site, Ni(14) is bonded in a 12-coordinate geometry to one Er(2), one Er(3), two equivalent Er(5), two equivalent Ni(4), two equivalent Ni(9), one Al(12), one Al(15), and two equivalent Al(1) atoms. In the fifteenth Ni site, Ni(15) is bonded in a 12-coordinate geometry to one Er(1), one Er(3), two equivalent Er(6), two equivalent Ni(5), two equivalent Ni(7), one Al(11), one Al(14), and two equivalent Al(3) atoms. There are fifteen inequivalent Al sites. In the first Al site, Al(1) is bonded in a 6-coordinate geometry to two equivalent Er(2), two equivalent Er(3), one Ni(11), one Ni(4), one Ni(6), one Ni(9), and two equivalent Ni(14) atoms. In the second Al site, Al(2) is bonded in a 6-coordinate geometry to two equivalent Er(1), two equivalent Er(4), one Ni(10), one Ni(12), one Ni(3), one Ni(5), and two equivalent Ni(13) atoms. In the third Al site, Al(3) is bonded in a 6-coordinate geometry to two equivalent Er(1), two equivalent Er(3), one Ni(1), one Ni(5), one Ni(7), one Ni(9), and two equivalent Ni(15) atoms. In the fourth Al site, Al(4) is bonded in a 4-coordinate geometry to two equivalent Er(2), two equivalent Er(4), one Ni(10), one Ni(2), one Ni(6), and one Ni(8) atom. In the fifth Al site, Al(5) is bonded in a 4-coordinate geometry to two equivalent Er(1), two equivalent Er(3), one Ni(1), one Ni(11), one Ni(3), and one Ni(7) atom. In the sixth Al site, Al(6) is bonded in a 4-coordinate geometry to two equivalent Er(2), two equivalent Er(4), one Ni(12), one Ni(2), one Ni(4), and one Ni(8) atom. In the seventh Al site, Al(7) is bonded in a 4-coordinate geometry to one Er(2), one Er(4), two equivalent Ni(6), and two equivalent Ni(8) atoms. In the eighth Al site, Al(8) is bonded in a 4-coordinate geometry to one Er(1), one Er(3), two equivalent Ni(1), and two equivalent Ni(11) atoms. In the ninth Al site, Al(9) is bonded in a 4-coordinate geometry to one Er(2), one Er(4), two equivalent Ni(12), and two equivalent Ni(2) atoms. In the tenth Al site, Al(10) is bonded in a 4-coordinate geometry to one Er(2), one Er(3), two equivalent Ni(11), and two equivalent Ni(6) atoms. In the eleventh Al site, Al(11) is bonded in a 5-coordinate geometry to one Er(1), one Er(4), one Ni(15), two equivalent Ni(12), and two equivalent Ni(5) atoms. In the twelfth Al site, Al(12) is bonded in a 5-coordinate geometry to one Er(1), one Er(3), one Ni(14), two equivalent Ni(1), and two equivalent Ni(9) atoms. In the thirteenth Al site, Al(13) is bonded in a 5-coordinate geometry to one Er(2), one Er(4), one Ni(13), two equivalent Ni(10), and two equivalent Ni(2) atoms. In the fourteenth Al site, Al(14) is bonded in a 6-coordinate geometry to one Er(1), one Er(3), one Ni(13), one Ni(15), two equivalent Ni(3), and two equivalent Ni(7) atoms. In the fifteenth Al site, Al(15) is bonded in a 5-coordinate geometry to one Er(2), one Er(4), one Ni(14), two equivalent Ni(4), and two equivalent Ni(8) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Er2(AlNi)5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.016
_cell_length_b   8.767
_cell_length_c   15.262
_cell_angle_alpha   89.932
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   537.396
_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
  Er  Er0  1  0.000  0.000  0.336  1.0
  Er  Er1  1  0.000  0.504  0.835  1.0
  Er  Er2  1  0.000  0.505  0.170  1.0
  Er  Er3  1  0.000  0.002  0.664  1.0
  Er  Er4  1  0.500  0.994  0.001  1.0
  Er  Er5  1  0.500  0.498  0.497  1.0
  Al  Al6  1  0.500  0.507  0.001  1.0
  Al  Al7  1  0.500  0.009  0.501  1.0
  Al  Al8  1  0.500  0.748  0.255  1.0
  Al  Al9  1  0.500  0.253  0.751  1.0
  Al  Al10  1  0.500  0.248  0.249  1.0
  Al  Al11  1  0.500  0.753  0.748  1.0
  Al  Al12  1  0.000  0.148  0.851  1.0
  Al  Al13  1  0.000  0.148  0.149  1.0
  Al  Al14  1  0.000  0.650  0.649  1.0
  Al  Al15  1  0.000  0.299  0.001  1.0
  Al  Al16  1  0.000  0.783  0.494  1.0
  Al  Al17  1  0.000  0.849  0.142  1.0
  Al  Al18  1  0.000  0.350  0.640  1.0
  Al  Al19  1  0.000  0.360  0.360  1.0
  Al  Al20  1  0.000  0.849  0.859  1.0
  Ni  Ni21  1  0.500  0.995  0.184  1.0
  Ni  Ni22  1  0.500  0.500  0.680  1.0
  Ni  Ni23  1  0.500  0.226  0.405  1.0
  Ni  Ni24  1  0.500  0.727  0.907  1.0
  Ni  Ni25  1  0.500  0.781  0.410  1.0
  Ni  Ni26  1  0.500  0.275  0.910  1.0
  Ni  Ni27  1  0.500  0.496  0.316  1.0
  Ni  Ni28  1  0.500  0.999  0.818  1.0
  Ni  Ni29  1  0.500  0.724  0.096  1.0
  Ni  Ni30  1  0.500  0.228  0.593  1.0
  Ni  Ni31  1  0.500  0.275  0.091  1.0
  Ni  Ni32  1  0.500  0.774  0.588  1.0
  Ni  Ni33  1  0.000  0.198  0.499  1.0
  Ni  Ni34  1  0.000  0.697  0.001  1.0
  Ni  Ni35  1  0.000  0.650  0.349  1.0
[/CIF]
.