Sr2MnGaO5 crystallizes in the triclinic P1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to one O(10), one O(2), one O(6), one O(7), one O(8), one O(9), and two equivalent O(4) atoms. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(1), one O(10), one O(7), one O(8), one O(9), two equivalent O(4), and two equivalent O(6) atoms. In the third Sr site, Sr(3) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(5), one O(7), one O(8), one O(9), and two equivalent O(3) atoms. In the fourth Sr site, Sr(4) is bonded in a 9-coordinate geometry to one O(10), one O(2), one O(7), one O(8), one O(9), two equivalent O(3), and two equivalent O(5) atoms. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(10), one O(5), one O(6), one O(7), one O(8), and one O(9) atom to form MnO6 octahedra that share corners with four equivalent Mn(2)O6 octahedra,  a cornercorner with one Ga(1)O4 tetrahedra, and  a cornercorner with one Ga(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 6-8°. In the second Mn site, Mn(2) is bonded to one O(10), one O(3), one O(4), one O(7), one O(8), and one O(9) atom to form MnO6 octahedra that share corners with four equivalent Mn(1)O6 octahedra,  a cornercorner with one Ga(1)O4 tetrahedra, and  a cornercorner with one Ga(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 6-8°. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(1), one O(2), one O(3), and one O(6) atom to form GaO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Mn(2)O6 octahedra, and corners with two equivalent Ga(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 29-34°. In the second Ga site, Ga(2) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form GaO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Mn(2)O6 octahedra, and corners with two equivalent Ga(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 29-34°. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one Sr(2), one Sr(3), one Ga(1), and one Ga(2) atom to form distorted OSr2Ga2 tetrahedra that share corners with two equivalent O(10)Sr4Mn2 octahedra, corners with two equivalent O(7)Sr4Mn2 octahedra, corners with two equivalent O(8)Sr4Mn2 octahedra, corners with two equivalent O(9)Sr4Mn2 octahedra, and corners with two equivalent O(2)Sr2Ga2 tetrahedra. The corner-sharing octahedral tilt angles range from 20-76°. In the second O site, O(2) is bonded to one Sr(1), one Sr(4), one Ga(1), and one Ga(2) atom to form distorted OSr2Ga2 tetrahedra that share corners with two equivalent O(10)Sr4Mn2 octahedra, corners with two equivalent O(7)Sr4Mn2 octahedra, corners with two equivalent O(8)Sr4Mn2 octahedra, corners with two equivalent O(9)Sr4Mn2 octahedra, and corners with two equivalent O(1)Sr2Ga2 tetrahedra. The corner-sharing octahedral tilt angles range from 19-76°. In the third O site, O(3) is bonded in a 5-coordinate geometry to two equivalent Sr(3), two equivalent Sr(4), one Mn(2), and one Ga(1) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), one Mn(2), and one Ga(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Sr(3), two equivalent Sr(4), one Mn(1), and one Ga(2) atom. In the sixth O site, O(6) is bonded in a 5-coordinate geometry to one Sr(1), two equivalent Sr(2), one Mn(1), and one Ga(1) atom. In the seventh O site, O(7) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Mn(1), and one Mn(2) atom to form distorted OSr4Mn2 octahedra that share corners with two equivalent O(9)Sr4Mn2 octahedra, corners with two equivalent O(1)Sr2Ga2 tetrahedra, corners with two equivalent O(2)Sr2Ga2 tetrahedra, edges with two equivalent O(9)Sr4Mn2 octahedra, faces with two equivalent O(10)Sr4Mn2 octahedra, and faces with two equivalent O(8)Sr4Mn2 octahedra. The corner-sharing octahedral tilt angles are 1°. In the eighth O site, O(8) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Mn(1), and one Mn(2) atom to form distorted OSr4Mn2 octahedra that share corners with two equivalent O(10)Sr4Mn2 octahedra, corners with two equivalent O(1)Sr2Ga2 tetrahedra, corners with two equivalent O(2)Sr2Ga2 tetrahedra, edges with two equivalent O(10)Sr4Mn2 octahedra, faces with two equivalent O(7)Sr4Mn2 octahedra, and faces with two equivalent O(9)Sr4Mn2 octahedra. The corner-sharing octahedral tilt angles are 1°. In the ninth O site, O(9) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Mn(1), and one Mn(2) atom to form distorted OSr4Mn2 octahedra that share corners with two equivalent O(7)Sr4Mn2 octahedra, corners with two equivalent O(1)Sr2Ga2 tetrahedra, corners with two equivalent O(2)Sr2Ga2 tetrahedra, edges with two equivalent O(7)Sr4Mn2 octahedra, faces with two equivalent O(10)Sr4Mn2 octahedra, and faces with two equivalent O(8)Sr4Mn2 octahedra. The corner-sharing octahedral tilt angles are 1°. In the tenth O site, O(10) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Mn(1), and one Mn(2) atom to form distorted OSr4Mn2 octahedra that share corners with two equivalent O(8)Sr4Mn2 octahedra, corners with two equivalent O(1)Sr2Ga2 tetrahedra, corners with two equivalent O(2)Sr2Ga2 tetrahedra, edges with two equivalent O(8)Sr4Mn2 octahedra, faces with two equivalent O(7)Sr4Mn2 octahedra, and faces with two equivalent O(9)Sr4Mn2 octahedra. The corner-sharing octahedral tilt angles are 1°.
Sr2MnGaO5 crystallizes in the triclinic P1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to one O(10), one O(2), one O(6), one O(7), one O(8), one O(9), and two equivalent O(4) atoms. The Sr(1)-O(10) bond length is 2.62 Å. The Sr(1)-O(2) bond length is 2.47 Å. The Sr(1)-O(6) bond length is 2.50 Å. The Sr(1)-O(7) bond length is 2.64 Å. The Sr(1)-O(8) bond length is 2.70 Å. The Sr(1)-O(9) bond length is 2.69 Å. There is one shorter (2.67 Å) and one longer (2.89 Å) Sr(1)-O(4) bond length. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(1), one O(10), one O(7), one O(8), one O(9), two equivalent O(4), and two equivalent O(6) atoms. The Sr(2)-O(1) bond length is 2.47 Å. The Sr(2)-O(10) bond length is 2.63 Å. The Sr(2)-O(7) bond length is 2.66 Å. The Sr(2)-O(8) bond length is 2.70 Å. The Sr(2)-O(9) bond length is 2.68 Å. There is one shorter (2.52 Å) and one longer (3.21 Å) Sr(2)-O(4) bond length. There is one shorter (2.66 Å) and one longer (2.96 Å) Sr(2)-O(6) bond length. In the third Sr site, Sr(3) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(5), one O(7), one O(8), one O(9), and two equivalent O(3) atoms. The Sr(3)-O(1) bond length is 2.47 Å. The Sr(3)-O(10) bond length is 2.70 Å. The Sr(3)-O(5) bond length is 2.50 Å. The Sr(3)-O(7) bond length is 2.69 Å. The Sr(3)-O(8) bond length is 2.63 Å. The Sr(3)-O(9) bond length is 2.63 Å. There is one shorter (2.67 Å) and one longer (2.89 Å) Sr(3)-O(3) bond length. In the fourth Sr site, Sr(4) is bonded in a 9-coordinate geometry to one O(10), one O(2), one O(7), one O(8), one O(9), two equivalent O(3), and two equivalent O(5) atoms. The Sr(4)-O(10) bond length is 2.69 Å. The Sr(4)-O(2) bond length is 2.47 Å. The Sr(4)-O(7) bond length is 2.69 Å. The Sr(4)-O(8) bond length is 2.63 Å. The Sr(4)-O(9) bond length is 2.65 Å. There is one shorter (2.52 Å) and one longer (3.21 Å) Sr(4)-O(3) bond length. There is one shorter (2.65 Å) and one longer (2.97 Å) Sr(4)-O(5) bond length. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(10), one O(5), one O(6), one O(7), one O(8), and one O(9) atom to form MnO6 octahedra that share corners with four equivalent Mn(2)O6 octahedra,  a cornercorner with one Ga(1)O4 tetrahedra, and  a cornercorner with one Ga(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 6-8°. The Mn(1)-O(10) bond length is 1.96 Å. The Mn(1)-O(5) bond length is 2.41 Å. The Mn(1)-O(6) bond length is 2.42 Å. The Mn(1)-O(7) bond length is 1.98 Å. The Mn(1)-O(8) bond length is 1.96 Å. The Mn(1)-O(9) bond length is 1.99 Å. In the second Mn site, Mn(2) is bonded to one O(10), one O(3), one O(4), one O(7), one O(8), and one O(9) atom to form MnO6 octahedra that share corners with four equivalent Mn(1)O6 octahedra,  a cornercorner with one Ga(1)O4 tetrahedra, and  a cornercorner with one Ga(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 6-8°. The Mn(2)-O(10) bond length is 1.98 Å. The Mn(2)-O(3) bond length is 2.28 Å. The Mn(2)-O(4) bond length is 2.28 Å. The Mn(2)-O(7) bond length is 1.95 Å. The Mn(2)-O(8) bond length is 1.99 Å. The Mn(2)-O(9) bond length is 1.94 Å. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(1), one O(2), one O(3), and one O(6) atom to form GaO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Mn(2)O6 octahedra, and corners with two equivalent Ga(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 29-34°. The Ga(1)-O(1) bond length is 1.91 Å. The Ga(1)-O(2) bond length is 1.90 Å. The Ga(1)-O(3) bond length is 1.87 Å. The Ga(1)-O(6) bond length is 1.85 Å. In the second Ga site, Ga(2) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form GaO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Mn(2)O6 octahedra, and corners with two equivalent Ga(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 29-34°. The Ga(2)-O(1) bond length is 1.90 Å. The Ga(2)-O(2) bond length is 1.91 Å. The Ga(2)-O(4) bond length is 1.87 Å. The Ga(2)-O(5) bond length is 1.85 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one Sr(2), one Sr(3), one Ga(1), and one Ga(2) atom to form distorted OSr2Ga2 tetrahedra that share corners with two equivalent O(10)Sr4Mn2 octahedra, corners with two equivalent O(7)Sr4Mn2 octahedra, corners with two equivalent O(8)Sr4Mn2 octahedra, corners with two equivalent O(9)Sr4Mn2 octahedra, and corners with two equivalent O(2)Sr2Ga2 tetrahedra. The corner-sharing octahedral tilt angles range from 20-76°. In the second O site, O(2) is bonded to one Sr(1), one Sr(4), one Ga(1), and one Ga(2) atom to form distorted OSr2Ga2 tetrahedra that share corners with two equivalent O(10)Sr4Mn2 octahedra, corners with two equivalent O(7)Sr4Mn2 octahedra, corners with two equivalent O(8)Sr4Mn2 octahedra, corners with two equivalent O(9)Sr4Mn2 octahedra, and corners with two equivalent O(1)Sr2Ga2 tetrahedra. The corner-sharing octahedral tilt angles range from 19-76°. In the third O site, O(3) is bonded in a 5-coordinate geometry to two equivalent Sr(3), two equivalent Sr(4), one Mn(2), and one Ga(1) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), one Mn(2), and one Ga(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Sr(3), two equivalent Sr(4), one Mn(1), and one Ga(2) atom. In the sixth O site, O(6) is bonded in a 5-coordinate geometry to one Sr(1), two equivalent Sr(2), one Mn(1), and one Ga(1) atom. In the seventh O site, O(7) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Mn(1), and one Mn(2) atom to form distorted OSr4Mn2 octahedra that share corners with two equivalent O(9)Sr4Mn2 octahedra, corners with two equivalent O(1)Sr2Ga2 tetrahedra, corners with two equivalent O(2)Sr2Ga2 tetrahedra, edges with two equivalent O(9)Sr4Mn2 octahedra, faces with two equivalent O(10)Sr4Mn2 octahedra, and faces with two equivalent O(8)Sr4Mn2 octahedra. The corner-sharing octahedral tilt angles are 1°. In the eighth O site, O(8) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Mn(1), and one Mn(2) atom to form distorted OSr4Mn2 octahedra that share corners with two equivalent O(10)Sr4Mn2 octahedra, corners with two equivalent O(1)Sr2Ga2 tetrahedra, corners with two equivalent O(2)Sr2Ga2 tetrahedra, edges with two equivalent O(10)Sr4Mn2 octahedra, faces with two equivalent O(7)Sr4Mn2 octahedra, and faces with two equivalent O(9)Sr4Mn2 octahedra. The corner-sharing octahedral tilt angles are 1°. In the ninth O site, O(9) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Mn(1), and one Mn(2) atom to form distorted OSr4Mn2 octahedra that share corners with two equivalent O(7)Sr4Mn2 octahedra, corners with two equivalent O(1)Sr2Ga2 tetrahedra, corners with two equivalent O(2)Sr2Ga2 tetrahedra, edges with two equivalent O(7)Sr4Mn2 octahedra, faces with two equivalent O(10)Sr4Mn2 octahedra, and faces with two equivalent O(8)Sr4Mn2 octahedra. The corner-sharing octahedral tilt angles are 1°. In the tenth O site, O(10) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Mn(1), and one Mn(2) atom to form distorted OSr4Mn2 octahedra that share corners with two equivalent O(8)Sr4Mn2 octahedra, corners with two equivalent O(1)Sr2Ga2 tetrahedra, corners with two equivalent O(2)Sr2Ga2 tetrahedra, edges with two equivalent O(8)Sr4Mn2 octahedra, faces with two equivalent O(7)Sr4Mn2 octahedra, and faces with two equivalent O(9)Sr4Mn2 octahedra. The corner-sharing octahedral tilt angles are 1°.