ScGaO3 crystallizes in the hexagonal P6_3cm space group. There are two inequivalent Sc sites. In the first Sc site, Sc(1) is bonded in a 7-coordinate geometry to one O(3), three equivalent O(1), and three equivalent O(2) atoms. In the second Sc site, Sc(2) is bonded to one O(4), three equivalent O(1), and three equivalent O(2) atoms to form distorted ScO7 pentagonal bipyramids that share corners with three equivalent Ga(1)O5 trigonal bipyramids and edges with three equivalent Ga(1)O5 trigonal bipyramids. Ga(1) is bonded to one O(1), one O(2), one O(4), and two equivalent O(3) atoms to form GaO5 trigonal bipyramids that share  a cornercorner with one Sc(2)O7 pentagonal bipyramid, corners with six equivalent Ga(1)O5 trigonal bipyramids, and  an edgeedge with one Sc(2)O7 pentagonal bipyramid. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Sc(2), two equivalent Sc(1), and one Ga(1) atom to form OSc3Ga tetrahedra that share corners with four equivalent O(2)Sc3Ga tetrahedra, corners with six equivalent O(1)Sc3Ga tetrahedra, corners with two equivalent O(4)ScGa3 trigonal pyramids, edges with three equivalent O(2)Sc3Ga tetrahedra, and edges with two equivalent O(3)ScGa3 trigonal pyramids. In the second O site, O(2) is bonded to one Sc(2), two equivalent Sc(1), and one Ga(1) atom to form distorted OSc3Ga tetrahedra that share corners with four equivalent O(1)Sc3Ga tetrahedra, corners with six equivalent O(2)Sc3Ga tetrahedra, corners with four equivalent O(3)ScGa3 trigonal pyramids, edges with three equivalent O(1)Sc3Ga tetrahedra, and  an edgeedge with one O(4)ScGa3 trigonal pyramid. In the third O site, O(3) is bonded to one Sc(1) and three equivalent Ga(1) atoms to form distorted OScGa3 trigonal pyramids that share corners with six equivalent O(2)Sc3Ga tetrahedra, corners with three equivalent O(3)ScGa3 trigonal pyramids, corners with three equivalent O(4)ScGa3 trigonal pyramids, and edges with three equivalent O(1)Sc3Ga tetrahedra. In the fourth O site, O(4) is bonded to one Sc(2) and three equivalent Ga(1) atoms to form distorted OScGa3 trigonal pyramids that share corners with six equivalent O(1)Sc3Ga tetrahedra, corners with six equivalent O(3)ScGa3 trigonal pyramids, and edges with three equivalent O(2)Sc3Ga tetrahedra.
ScGaO3 crystallizes in the hexagonal P6_3cm space group. There are two inequivalent Sc sites. In the first Sc site, Sc(1) is bonded in a 7-coordinate geometry to one O(3), three equivalent O(1), and three equivalent O(2) atoms. The Sc(1)-O(3) bond length is 2.46 Å. All Sc(1)-O(1) bond lengths are 2.14 Å. All Sc(1)-O(2) bond lengths are 2.17 Å. In the second Sc site, Sc(2) is bonded to one O(4), three equivalent O(1), and three equivalent O(2) atoms to form distorted ScO7 pentagonal bipyramids that share corners with three equivalent Ga(1)O5 trigonal bipyramids and edges with three equivalent Ga(1)O5 trigonal bipyramids. The Sc(2)-O(4) bond length is 2.31 Å. All Sc(2)-O(1) bond lengths are 2.14 Å. All Sc(2)-O(2) bond lengths are 2.19 Å. Ga(1) is bonded to one O(1), one O(2), one O(4), and two equivalent O(3) atoms to form GaO5 trigonal bipyramids that share  a cornercorner with one Sc(2)O7 pentagonal bipyramid, corners with six equivalent Ga(1)O5 trigonal bipyramids, and  an edgeedge with one Sc(2)O7 pentagonal bipyramid. The Ga(1)-O(1) bond length is 1.93 Å. The Ga(1)-O(2) bond length is 1.91 Å. The Ga(1)-O(4) bond length is 1.94 Å. Both Ga(1)-O(3) bond lengths are 1.93 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Sc(2), two equivalent Sc(1), and one Ga(1) atom to form OSc3Ga tetrahedra that share corners with four equivalent O(2)Sc3Ga tetrahedra, corners with six equivalent O(1)Sc3Ga tetrahedra, corners with two equivalent O(4)ScGa3 trigonal pyramids, edges with three equivalent O(2)Sc3Ga tetrahedra, and edges with two equivalent O(3)ScGa3 trigonal pyramids. In the second O site, O(2) is bonded to one Sc(2), two equivalent Sc(1), and one Ga(1) atom to form distorted OSc3Ga tetrahedra that share corners with four equivalent O(1)Sc3Ga tetrahedra, corners with six equivalent O(2)Sc3Ga tetrahedra, corners with four equivalent O(3)ScGa3 trigonal pyramids, edges with three equivalent O(1)Sc3Ga tetrahedra, and  an edgeedge with one O(4)ScGa3 trigonal pyramid. In the third O site, O(3) is bonded to one Sc(1) and three equivalent Ga(1) atoms to form distorted OScGa3 trigonal pyramids that share corners with six equivalent O(2)Sc3Ga tetrahedra, corners with three equivalent O(3)ScGa3 trigonal pyramids, corners with three equivalent O(4)ScGa3 trigonal pyramids, and edges with three equivalent O(1)Sc3Ga tetrahedra. In the fourth O site, O(4) is bonded to one Sc(2) and three equivalent Ga(1) atoms to form distorted OScGa3 trigonal pyramids that share corners with six equivalent O(1)Sc3Ga tetrahedra, corners with six equivalent O(3)ScGa3 trigonal pyramids, and edges with three equivalent O(2)Sc3Ga tetrahedra.