SmLaB12 is Calcium hexaboride-derived structured and crystallizes in the tetragonal P4/mmm space group. Sm(1) is bonded in a 24-coordinate geometry to eight equivalent B(3) and sixteen equivalent B(1) atoms. La(1) is bonded in a 24-coordinate geometry to eight equivalent B(2) and sixteen equivalent B(1) atoms. There are three inequivalent B sites. In the first B site, B(1) is bonded in a 5-coordinate geometry to two equivalent Sm(1), two equivalent La(1), one B(2), one B(3), and three equivalent B(1) atoms. In the second B site, B(2) is bonded in a 5-coordinate geometry to four equivalent La(1), one B(2), and four equivalent B(1) atoms. In the third B site, B(3) is bonded in a 5-coordinate geometry to four equivalent Sm(1), one B(3), and four equivalent B(1) atoms.
SmLaB12 is Calcium hexaboride-derived structured and crystallizes in the tetragonal P4/mmm space group. Sm(1) is bonded in a 24-coordinate geometry to eight equivalent B(3) and sixteen equivalent B(1) atoms. All Sm(1)-B(3) bond lengths are 3.04 Å. All Sm(1)-B(1) bond lengths are 3.03 Å. La(1) is bonded in a 24-coordinate geometry to eight equivalent B(2) and sixteen equivalent B(1) atoms. All La(1)-B(2) bond lengths are 3.04 Å. All La(1)-B(1) bond lengths are 3.04 Å. There are three inequivalent B sites. In the first B site, B(1) is bonded in a 5-coordinate geometry to two equivalent Sm(1), two equivalent La(1), one B(2), one B(3), and three equivalent B(1) atoms. The B(1)-B(2) bond length is 1.76 Å. The B(1)-B(3) bond length is 1.75 Å. There is one shorter (1.65 Å) and two longer (1.76 Å) B(1)-B(1) bond lengths. In the second B site, B(2) is bonded in a 5-coordinate geometry to four equivalent La(1), one B(2), and four equivalent B(1) atoms. The B(2)-B(2) bond length is 1.67 Å. In the third B site, B(3) is bonded in a 5-coordinate geometry to four equivalent Sm(1), one B(3), and four equivalent B(1) atoms. The B(3)-B(3) bond length is 1.64 Å.