The structure described by YCo5As3 crystallizes in the orthorhombic Pnma space group. Y(1) is bonded in a 17-coordinate geometry to one Co(2), one Co(4), three equivalent Co(1), three equivalent Co(3), three equivalent Co(5), two equivalent As(1), two equivalent As(2), and two equivalent As(3) atoms. There are five inequivalent Co sites. In the first Co site, Co(1) is bonded to three equivalent Y(1), one As(1), one As(2), and two equivalent As(3) atoms to form distorted CoY3As4 tetrahedra that share corners with two equivalent Co(4)YAs4 tetrahedra, corners with three equivalent Co(3)Y3As4 tetrahedra, corners with four equivalent Co(1)Y3As4 tetrahedra, edges with two equivalent Co(1)Y3As4 tetrahedra, faces with two equivalent Co(4)YAs4 tetrahedra, and faces with three equivalent Co(3)Y3As4 tetrahedra. In the second Co site, Co(2) is bonded in a 5-coordinate geometry to one Y(1), one As(2), two equivalent As(1), and two equivalent As(3) atoms. In the third Co site, Co(3) is bonded to three equivalent Y(1), one As(1), one As(3), and two equivalent As(2) atoms to form distorted CoY3As4 tetrahedra that share  a cornercorner with one Co(4)YAs4 tetrahedra, corners with three equivalent Co(1)Y3As4 tetrahedra, corners with four equivalent Co(3)Y3As4 tetrahedra, edges with two equivalent Co(3)Y3As4 tetrahedra, edges with three equivalent Co(4)YAs4 tetrahedra, and faces with three equivalent Co(1)Y3As4 tetrahedra. In the fourth Co site, Co(4) is bonded to one Y(1), one As(3), and three equivalent As(1) atoms to form distorted CoYAs4 tetrahedra that share  a cornercorner with one Co(3)Y3As4 tetrahedra, corners with two equivalent Co(1)Y3As4 tetrahedra, corners with two equivalent Co(4)YAs4 tetrahedra, edges with two equivalent Co(4)YAs4 tetrahedra, edges with three equivalent Co(3)Y3As4 tetrahedra, and faces with two equivalent Co(1)Y3As4 tetrahedra. In the fifth Co site, Co(5) is bonded in a 4-coordinate geometry to three equivalent Y(1), one As(3), and three equivalent As(2) atoms. There are three inequivalent As sites. In the first As site, As(3) is bonded in a 9-coordinate geometry to two equivalent Y(1), one Co(3), one Co(4), one Co(5), two equivalent Co(1), and two equivalent Co(2) atoms. In the second As site, As(1) is bonded in a 9-coordinate geometry to two equivalent Y(1), one Co(1), one Co(3), two equivalent Co(2), and three equivalent Co(4) atoms. In the third As site, As(2) is bonded in a 9-coordinate geometry to two equivalent Y(1), one Co(1), one Co(2), two equivalent Co(3), and three equivalent Co(5) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_YCo5As3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.807
_cell_length_b   12.068
_cell_length_c   10.573
_cell_angle_alpha   89.998
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   485.767
_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
  Y  Y0  1  0.750  0.701  0.081  1.0
  Y  Y1  1  0.250  0.299  0.919  1.0
  Y  Y2  1  0.250  0.799  0.581  1.0
  Y  Y3  1  0.750  0.201  0.419  1.0
  Co  Co4  1  0.750  0.696  0.383  1.0
  Co  Co5  1  0.250  0.304  0.617  1.0
  Co  Co6  1  0.250  0.804  0.883  1.0
  Co  Co7  1  0.750  0.196  0.117  1.0
  Co  Co8  1  0.750  0.990  0.204  1.0
  Co  Co9  1  0.250  0.010  0.796  1.0
  Co  Co10  1  0.250  0.510  0.704  1.0
  Co  Co11  1  0.750  0.490  0.296  1.0
  Co  Co12  1  0.750  0.674  0.785  1.0
  Co  Co13  1  0.250  0.326  0.215  1.0
  Co  Co14  1  0.250  0.826  0.285  1.0
  Co  Co15  1  0.750  0.174  0.715  1.0
  Co  Co16  1  0.750  0.933  0.971  1.0
  Co  Co17  1  0.250  0.067  0.029  1.0
  Co  Co18  1  0.250  0.567  0.471  1.0
  Co  Co19  1  0.750  0.433  0.529  1.0
  Co  Co20  1  0.750  0.989  0.596  1.0
  Co  Co21  1  0.250  0.011  0.404  1.0
  Co  Co22  1  0.250  0.511  0.096  1.0
  Co  Co23  1  0.750  0.489  0.904  1.0
  As  As24  1  0.750  0.616  0.583  1.0
  As  As25  1  0.250  0.384  0.417  1.0
  As  As26  1  0.250  0.884  0.083  1.0
  As  As27  1  0.750  0.116  0.917  1.0
  As  As28  1  0.750  0.892  0.399  1.0
  As  As29  1  0.250  0.108  0.601  1.0
  As  As30  1  0.250  0.608  0.899  1.0
  As  As31  1  0.750  0.392  0.101  1.0
  As  As32  1  0.750  0.867  0.771  1.0
  As  As33  1  0.250  0.133  0.229  1.0
  As  As34  1  0.250  0.633  0.271  1.0
  As  As35  1  0.750  0.367  0.729  1.0
[/CIF]
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The structure described by YCo5As3 crystallizes in the orthorhombic Pnma space group. Y(1) is bonded in a 17-coordinate geometry to one Co(2), one Co(4), three equivalent Co(1), three equivalent Co(3), three equivalent Co(5), two equivalent As(1), two equivalent As(2), and two equivalent As(3) atoms. There are five inequivalent Co sites. In the first Co site, Co(1) is bonded to three equivalent Y(1), one As(1), one As(2), and two equivalent As(3) atoms to form distorted CoY3As4 tetrahedra that share corners with two equivalent Co(4)YAs4 tetrahedra, corners with three equivalent Co(3)Y3As4 tetrahedra, corners with four equivalent Co(1)Y3As4 tetrahedra, edges with two equivalent Co(1)Y3As4 tetrahedra, faces with two equivalent Co(4)YAs4 tetrahedra, and faces with three equivalent Co(3)Y3As4 tetrahedra. In the second Co site, Co(2) is bonded in a 5-coordinate geometry to one Y(1), one As(2), two equivalent As(1), and two equivalent As(3) atoms. In the third Co site, Co(3) is bonded to three equivalent Y(1), one As(1), one As(3), and two equivalent As(2) atoms to form distorted CoY3As4 tetrahedra that share  a cornercorner with one Co(4)YAs4 tetrahedra, corners with three equivalent Co(1)Y3As4 tetrahedra, corners with four equivalent Co(3)Y3As4 tetrahedra, edges with two equivalent Co(3)Y3As4 tetrahedra, edges with three equivalent Co(4)YAs4 tetrahedra, and faces with three equivalent Co(1)Y3As4 tetrahedra. In the fourth Co site, Co(4) is bonded to one Y(1), one As(3), and three equivalent As(1) atoms to form distorted CoYAs4 tetrahedra that share  a cornercorner with one Co(3)Y3As4 tetrahedra, corners with two equivalent Co(1)Y3As4 tetrahedra, corners with two equivalent Co(4)YAs4 tetrahedra, edges with two equivalent Co(4)YAs4 tetrahedra, edges with three equivalent Co(3)Y3As4 tetrahedra, and faces with two equivalent Co(1)Y3As4 tetrahedra. In the fifth Co site, Co(5) is bonded in a 4-coordinate geometry to three equivalent Y(1), one As(3), and three equivalent As(2) atoms. There are three inequivalent As sites. In the first As site, As(3) is bonded in a 9-coordinate geometry to two equivalent Y(1), one Co(3), one Co(4), one Co(5), two equivalent Co(1), and two equivalent Co(2) atoms. In the second As site, As(1) is bonded in a 9-coordinate geometry to two equivalent Y(1), one Co(1), one Co(3), two equivalent Co(2), and three equivalent Co(4) atoms. In the third As site, As(2) is bonded in a 9-coordinate geometry to two equivalent Y(1), one Co(1), one Co(2), two equivalent Co(3), and three equivalent Co(5) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_YCo5As3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.807
_cell_length_b   12.068
_cell_length_c   10.573
_cell_angle_alpha   89.998
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   485.767
_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
  Y  Y0  1  0.750  0.701  0.081  1.0
  Y  Y1  1  0.250  0.299  0.919  1.0
  Y  Y2  1  0.250  0.799  0.581  1.0
  Y  Y3  1  0.750  0.201  0.419  1.0
  Co  Co4  1  0.750  0.696  0.383  1.0
  Co  Co5  1  0.250  0.304  0.617  1.0
  Co  Co6  1  0.250  0.804  0.883  1.0
  Co  Co7  1  0.750  0.196  0.117  1.0
  Co  Co8  1  0.750  0.990  0.204  1.0
  Co  Co9  1  0.250  0.010  0.796  1.0
  Co  Co10  1  0.250  0.510  0.704  1.0
  Co  Co11  1  0.750  0.490  0.296  1.0
  Co  Co12  1  0.750  0.674  0.785  1.0
  Co  Co13  1  0.250  0.326  0.215  1.0
  Co  Co14  1  0.250  0.826  0.285  1.0
  Co  Co15  1  0.750  0.174  0.715  1.0
  Co  Co16  1  0.750  0.933  0.971  1.0
  Co  Co17  1  0.250  0.067  0.029  1.0
  Co  Co18  1  0.250  0.567  0.471  1.0
  Co  Co19  1  0.750  0.433  0.529  1.0
  Co  Co20  1  0.750  0.989  0.596  1.0
  Co  Co21  1  0.250  0.011  0.404  1.0
  Co  Co22  1  0.250  0.511  0.096  1.0
  Co  Co23  1  0.750  0.489  0.904  1.0
  As  As24  1  0.750  0.616  0.583  1.0
  As  As25  1  0.250  0.384  0.417  1.0
  As  As26  1  0.250  0.884  0.083  1.0
  As  As27  1  0.750  0.116  0.917  1.0
  As  As28  1  0.750  0.892  0.399  1.0
  As  As29  1  0.250  0.108  0.601  1.0
  As  As30  1  0.250  0.608  0.899  1.0
  As  As31  1  0.750  0.392  0.101  1.0
  As  As32  1  0.750  0.867  0.771  1.0
  As  As33  1  0.250  0.133  0.229  1.0
  As  As34  1  0.250  0.633  0.271  1.0
  As  As35  1  0.750  0.367  0.729  1.0
[/CIF]
.