Sr2TcO4 is (La,Ba)CuO4 structured and crystallizes in the tetragonal I4/mmm space group. Sr(1) is bonded in a 9-coordinate geometry to four equivalent O(1) and five equivalent O(2) atoms. Tc(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form corner-sharing TcO6 octahedra. The corner-sharing octahedra are not tilted. There are two inequivalent O sites. In the first O site, O(2) is bonded to five equivalent Sr(1) and one Tc(1) atom to form OSr5Tc octahedra that share corners with five equivalent O(2)Sr5Tc octahedra, corners with twelve equivalent O(1)Sr4Tc2 octahedra, edges with eight equivalent O(2)Sr5Tc octahedra, and faces with four equivalent O(1)Sr4Tc2 octahedra. The corner-sharing octahedral tilt angles range from 0-57°. In the second O site, O(1) is bonded to four equivalent Sr(1) and two equivalent Tc(1) atoms to form distorted OSr4Tc2 octahedra that share corners with two equivalent O(1)Sr4Tc2 octahedra, corners with twelve equivalent O(2)Sr5Tc octahedra, edges with two equivalent O(1)Sr4Tc2 octahedra, faces with four equivalent O(1)Sr4Tc2 octahedra, and faces with four equivalent O(2)Sr5Tc octahedra. The corner-sharing octahedral tilt angles range from 0-57°.
Sr2TcO4 is (La,Ba)CuO4 structured and crystallizes in the tetragonal I4/mmm space group. Sr(1) is bonded in a 9-coordinate geometry to four equivalent O(1) and five equivalent O(2) atoms. All Sr(1)-O(1) bond lengths are 2.73 Å. There is one shorter (2.44 Å) and four longer (2.72 Å) Sr(1)-O(2) bond lengths. Tc(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form corner-sharing TcO6 octahedra. The corner-sharing octahedra are not tilted. Both Tc(1)-O(2) bond lengths are 2.11 Å. All Tc(1)-O(1) bond lengths are 1.92 Å. There are two inequivalent O sites. In the first O site, O(2) is bonded to five equivalent Sr(1) and one Tc(1) atom to form OSr5Tc octahedra that share corners with five equivalent O(2)Sr5Tc octahedra, corners with twelve equivalent O(1)Sr4Tc2 octahedra, edges with eight equivalent O(2)Sr5Tc octahedra, and faces with four equivalent O(1)Sr4Tc2 octahedra. The corner-sharing octahedral tilt angles range from 0-57°. In the second O site, O(1) is bonded to four equivalent Sr(1) and two equivalent Tc(1) atoms to form distorted OSr4Tc2 octahedra that share corners with two equivalent O(1)Sr4Tc2 octahedra, corners with twelve equivalent O(2)Sr5Tc octahedra, edges with two equivalent O(1)Sr4Tc2 octahedra, faces with four equivalent O(1)Sr4Tc2 octahedra, and faces with four equivalent O(2)Sr5Tc octahedra. The corner-sharing octahedral tilt angles range from 0-57°.