Sr(CaSi3)2 is High Pressure (4-7GPa) Tellurium-derived structured and crystallizes in the monoclinic C2/m space group. Sr(1) is bonded to two equivalent Si(3) and four equivalent Si(1) atoms to form distorted SrSi6 octahedra that share edges with two equivalent Sr(1)Si6 octahedra and edges with four equivalent Ca(1)Si6 octahedra. Ca(1) is bonded to one Si(1), two equivalent Si(3), and three equivalent Si(2) atoms to form distorted CaSi6 octahedra that share edges with two equivalent Sr(1)Si6 octahedra and edges with four equivalent Ca(1)Si6 octahedra. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 6-coordinate geometry to two equivalent Sr(1), one Ca(1), one Si(3), and two equivalent Si(2) atoms. In the second Si site, Si(2) is bonded in a 6-coordinate geometry to three equivalent Ca(1), one Si(2), and two equivalent Si(1) atoms. In the third Si site, Si(3) is bonded in a 6-coordinate geometry to one Sr(1), two equivalent Ca(1), one Si(1), and two equivalent Si(3) atoms.
Sr(CaSi3)2 is High Pressure (4-7GPa) Tellurium-derived structured and crystallizes in the monoclinic C2/m space group. Sr(1) is bonded to two equivalent Si(3) and four equivalent Si(1) atoms to form distorted SrSi6 octahedra that share edges with two equivalent Sr(1)Si6 octahedra and edges with four equivalent Ca(1)Si6 octahedra. Both Sr(1)-Si(3) bond lengths are 3.13 Å. All Sr(1)-Si(1) bond lengths are 3.13 Å. Ca(1) is bonded to one Si(1), two equivalent Si(3), and three equivalent Si(2) atoms to form distorted CaSi6 octahedra that share edges with two equivalent Sr(1)Si6 octahedra and edges with four equivalent Ca(1)Si6 octahedra. The Ca(1)-Si(1) bond length is 3.10 Å. Both Ca(1)-Si(3) bond lengths are 3.09 Å. There is one shorter (3.04 Å) and two longer (3.05 Å) Ca(1)-Si(2) bond lengths. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 6-coordinate geometry to two equivalent Sr(1), one Ca(1), one Si(3), and two equivalent Si(2) atoms. The Si(1)-Si(3) bond length is 2.42 Å. Both Si(1)-Si(2) bond lengths are 2.41 Å. In the second Si site, Si(2) is bonded in a 6-coordinate geometry to three equivalent Ca(1), one Si(2), and two equivalent Si(1) atoms. The Si(2)-Si(2) bond length is 2.40 Å. In the third Si site, Si(3) is bonded in a 6-coordinate geometry to one Sr(1), two equivalent Ca(1), one Si(1), and two equivalent Si(3) atoms. Both Si(3)-Si(3) bond lengths are 2.44 Å.