LaYFe2(AsO)2 crystallizes in the tetragonal P4mm space group. La(1) is bonded in a 4-coordinate geometry to four equivalent As(1) and four equivalent O(1) atoms. Y(1) is bonded in a 4-coordinate geometry to four equivalent As(2) and four equivalent O(1) atoms. Fe(1) is bonded to two equivalent As(1) and two equivalent As(2) atoms to form a mixture of edge and corner-sharing FeAs4 tetrahedra. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to four equivalent La(1) and four equivalent Fe(1) atoms. In the second As site, As(2) is bonded in a 8-coordinate geometry to four equivalent Y(1) and four equivalent Fe(1) atoms. O(1) is bonded to two equivalent La(1) and two equivalent Y(1) atoms to form a mixture of edge and corner-sharing OLa2Y2 tetrahedra.
LaYFe2(AsO)2 crystallizes in the tetragonal P4mm space group. La(1) is bonded in a 4-coordinate geometry to four equivalent As(1) and four equivalent O(1) atoms. All La(1)-As(1) bond lengths are 3.40 Å. All La(1)-O(1) bond lengths are 2.40 Å. Y(1) is bonded in a 4-coordinate geometry to four equivalent As(2) and four equivalent O(1) atoms. All Y(1)-As(2) bond lengths are 3.43 Å. All Y(1)-O(1) bond lengths are 2.29 Å. Fe(1) is bonded to two equivalent As(1) and two equivalent As(2) atoms to form a mixture of edge and corner-sharing FeAs4 tetrahedra. Both Fe(1)-As(1) bond lengths are 2.60 Å. Both Fe(1)-As(2) bond lengths are 2.60 Å. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to four equivalent La(1) and four equivalent Fe(1) atoms. In the second As site, As(2) is bonded in a 8-coordinate geometry to four equivalent Y(1) and four equivalent Fe(1) atoms. O(1) is bonded to two equivalent La(1) and two equivalent Y(1) atoms to form a mixture of edge and corner-sharing OLa2Y2 tetrahedra.