Materials Data on Ba(LuSe2)2 by Materials Project
Ba(LuSe2)2 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Ba2+ is bonded in a 8-coordinate geometry to eight Se2- atoms. There are a spread of Ba–Se bond distances ranging from 3.32–3.49 Å. There are two inequivalent Lu3+ sites. In the first Lu3+ site, Lu3+ is bonded to six Se2- atoms to form a mixture of corner and edge-sharing LuSe6 octahedra. The corner-sharing octahedra tilt angles range from 48–59°. There are a spread of Lu–Se bond distances ranging from 2.79–2.86 Å. In the second Lu3+ site, Lu3+ is bonded to six Se2- atoms to form a mixture of corner and edge-sharing LuSe6 octahedra. The corner-sharing octahedra tilt angles range from 48–59°. There are a spread of Lu–Se bond distances ranging from 2.81–2.89 Å. There are four inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 5-coordinate geometry to two equivalent Ba2+ and three Lu3+ atoms. In the second Se2- site, Se2- is bonded to two equivalent Ba2+ and three equivalent Lu3+ atoms to form a mixture of distorted corner and edge-sharing SeBa2Lu3 square pyramids. In the third Se2- site, Se2- is bonded to two equivalent Ba2+ and three Lu3+ atoms to form a mixture of distorted corner and edge-sharing SeBa2Lu3 trigonal bipyramids. In the fourth Se2- site, Se2- is bonded in a 5-coordinate geometry to two equivalent Ba2+ and three equivalent Lu3+ atoms.