EuYAl6(BO3)8 is Calcite-derived structured and crystallizes in the monoclinic C2 space group. Eu(1) is bonded in a 6-coordinate geometry to two equivalent O(10), two equivalent O(11), and two equivalent O(7) atoms. Y(1) is bonded in a 6-coordinate geometry to two equivalent O(12), two equivalent O(8), and two equivalent O(9) atoms. There are four inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(11), one O(2), one O(3), one O(5), one O(6), and one O(8) atom to form edge-sharing AlO6 octahedra. In the second Al site, Al(2) is bonded to one O(1), one O(12), one O(3), one O(4), one O(6), and one O(7) atom to form edge-sharing AlO6 octahedra. In the third Al site, Al(3) is bonded to two equivalent O(10), two equivalent O(2), and two equivalent O(5) atoms to form edge-sharing AlO6 octahedra. In the fourth Al site, Al(4) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(9) atoms to form edge-sharing AlO6 octahedra. There are four inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(10), one O(2), and one O(7) atom. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(1), one O(8), and one O(9) atom. In the third B site, B(3) is bonded in a trigonal planar geometry to one O(11), one O(12), and one O(3) atom. In the fourth B site, B(4) is bonded in a trigonal planar geometry to one O(4), one O(5), and one O(6) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Al(2), one Al(4), and one B(2) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Al(1), one Al(3), and one B(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Al(1), one Al(2), and one B(3) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Al(2), one Al(4), and one B(4) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Al(1), one Al(3), and one B(4) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Al(1), one Al(2), and one B(4) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Eu(1), one Al(2), and one B(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Y(1), one Al(1), and one B(2) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Y(1), one Al(4), and one B(2) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Eu(1), one Al(3), and one B(1) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one Eu(1), one Al(1), and one B(3) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Y(1), one Al(2), and one B(3) atom.
EuYAl6(BO3)8 is Calcite-derived structured and crystallizes in the monoclinic C2 space group. Eu(1) is bonded in a 6-coordinate geometry to two equivalent O(10), two equivalent O(11), and two equivalent O(7) atoms. Both Eu(1)-O(10) bond lengths are 2.38 Å. Both Eu(1)-O(11) bond lengths are 2.40 Å. Both Eu(1)-O(7) bond lengths are 2.40 Å. Y(1) is bonded in a 6-coordinate geometry to two equivalent O(12), two equivalent O(8), and two equivalent O(9) atoms. Both Y(1)-O(12) bond lengths are 2.33 Å. Both Y(1)-O(8) bond lengths are 2.34 Å. Both Y(1)-O(9) bond lengths are 2.35 Å. There are four inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(11), one O(2), one O(3), one O(5), one O(6), and one O(8) atom to form edge-sharing AlO6 octahedra. The Al(1)-O(11) bond length is 1.86 Å. The Al(1)-O(2) bond length is 1.96 Å. The Al(1)-O(3) bond length is 1.95 Å. The Al(1)-O(5) bond length is 1.94 Å. The Al(1)-O(6) bond length is 1.94 Å. The Al(1)-O(8) bond length is 1.88 Å. In the second Al site, Al(2) is bonded to one O(1), one O(12), one O(3), one O(4), one O(6), and one O(7) atom to form edge-sharing AlO6 octahedra. The Al(2)-O(1) bond length is 1.95 Å. The Al(2)-O(12) bond length is 1.88 Å. The Al(2)-O(3) bond length is 1.96 Å. The Al(2)-O(4) bond length is 1.94 Å. The Al(2)-O(6) bond length is 1.94 Å. The Al(2)-O(7) bond length is 1.85 Å. In the third Al site, Al(3) is bonded to two equivalent O(10), two equivalent O(2), and two equivalent O(5) atoms to form edge-sharing AlO6 octahedra. Both Al(3)-O(10) bond lengths are 1.86 Å. Both Al(3)-O(2) bond lengths are 1.95 Å. Both Al(3)-O(5) bond lengths are 1.94 Å. In the fourth Al site, Al(4) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(9) atoms to form edge-sharing AlO6 octahedra. Both Al(4)-O(1) bond lengths are 1.95 Å. Both Al(4)-O(4) bond lengths are 1.94 Å. Both Al(4)-O(9) bond lengths are 1.88 Å. There are four inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(10), one O(2), and one O(7) atom. The B(1)-O(10) bond length is 1.37 Å. The B(1)-O(2) bond length is 1.39 Å. The B(1)-O(7) bond length is 1.37 Å. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(1), one O(8), and one O(9) atom. The B(2)-O(1) bond length is 1.39 Å. The B(2)-O(8) bond length is 1.38 Å. The B(2)-O(9) bond length is 1.38 Å. In the third B site, B(3) is bonded in a trigonal planar geometry to one O(11), one O(12), and one O(3) atom. The B(3)-O(11) bond length is 1.36 Å. The B(3)-O(12) bond length is 1.38 Å. The B(3)-O(3) bond length is 1.39 Å. In the fourth B site, B(4) is bonded in a trigonal planar geometry to one O(4), one O(5), and one O(6) atom. The B(4)-O(4) bond length is 1.39 Å. The B(4)-O(5) bond length is 1.39 Å. The B(4)-O(6) bond length is 1.39 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Al(2), one Al(4), and one B(2) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Al(1), one Al(3), and one B(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Al(1), one Al(2), and one B(3) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Al(2), one Al(4), and one B(4) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Al(1), one Al(3), and one B(4) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Al(1), one Al(2), and one B(4) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Eu(1), one Al(2), and one B(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Y(1), one Al(1), and one B(2) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Y(1), one Al(4), and one B(2) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Eu(1), one Al(3), and one B(1) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one Eu(1), one Al(1), and one B(3) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Y(1), one Al(2), and one B(3) atom.