Yb2EuO4 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Yb sites. In the first Yb site, Yb(1) is bonded to one O(2), two equivalent O(1), and three equivalent O(3) atoms to form a mixture of edge and corner-sharing YbO6 octahedra. The corner-sharing octahedral tilt angles range from 49-73°. In the second Yb site, Yb(2) is bonded to one O(1), two equivalent O(2), and three equivalent O(4) atoms to form a mixture of distorted edge and corner-sharing YbO6 octahedra. The corner-sharing octahedral tilt angles range from 49-73°. Eu(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Yb(2), two equivalent Yb(1), and two equivalent Eu(1) atoms to form a mixture of distorted edge and corner-sharing OYb3Eu2 trigonal bipyramids. In the second O site, O(2) is bonded to one Yb(1), two equivalent Yb(2), and two equivalent Eu(1) atoms to form a mixture of distorted edge and corner-sharing OYb3Eu2 trigonal bipyramids. In the third O site, O(3) is bonded to three equivalent Yb(1) and two equivalent Eu(1) atoms to form a mixture of distorted edge and corner-sharing OYb3Eu2 square pyramids. In the fourth O site, O(4) is bonded to three equivalent Yb(2) and two equivalent Eu(1) atoms to form a mixture of distorted edge and corner-sharing OYb3Eu2 trigonal bipyramids.
Yb2EuO4 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Yb sites. In the first Yb site, Yb(1) is bonded to one O(2), two equivalent O(1), and three equivalent O(3) atoms to form a mixture of edge and corner-sharing YbO6 octahedra. The corner-sharing octahedral tilt angles range from 49-73°. The Yb(1)-O(2) bond length is 2.26 Å. Both Yb(1)-O(1) bond lengths are 2.23 Å. There is one shorter (2.30 Å) and two longer (2.42 Å) Yb(1)-O(3) bond lengths. In the second Yb site, Yb(2) is bonded to one O(1), two equivalent O(2), and three equivalent O(4) atoms to form a mixture of distorted edge and corner-sharing YbO6 octahedra. The corner-sharing octahedral tilt angles range from 49-73°. The Yb(2)-O(1) bond length is 2.24 Å. Both Yb(2)-O(2) bond lengths are 2.34 Å. There is one shorter (2.30 Å) and two longer (2.35 Å) Yb(2)-O(4) bond lengths. Eu(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. There is one shorter (2.62 Å) and one longer (2.72 Å) Eu(1)-O(1) bond length. Both Eu(1)-O(2) bond lengths are 2.41 Å. Both Eu(1)-O(3) bond lengths are 2.48 Å. Both Eu(1)-O(4) bond lengths are 2.46 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Yb(2), two equivalent Yb(1), and two equivalent Eu(1) atoms to form a mixture of distorted edge and corner-sharing OYb3Eu2 trigonal bipyramids. In the second O site, O(2) is bonded to one Yb(1), two equivalent Yb(2), and two equivalent Eu(1) atoms to form a mixture of distorted edge and corner-sharing OYb3Eu2 trigonal bipyramids. In the third O site, O(3) is bonded to three equivalent Yb(1) and two equivalent Eu(1) atoms to form a mixture of distorted edge and corner-sharing OYb3Eu2 square pyramids. In the fourth O site, O(4) is bonded to three equivalent Yb(2) and two equivalent Eu(1) atoms to form a mixture of distorted edge and corner-sharing OYb3Eu2 trigonal bipyramids.