Materials Data on La3Si6N11 by Materials Project
La3Si6N11 crystallizes in the tetragonal P4bm space group. The structure is three-dimensional. there are two inequivalent La3+ sites. In the first La3+ site, La3+ is bonded in a 8-coordinate geometry to eight N3- atoms. There are a spread of La–N bond distances ranging from 2.52–2.89 Å. In the second La3+ site, La3+ is bonded in a 8-coordinate geometry to eight N3- atoms. All La–N bond lengths are 2.65 Å. There are two inequivalent Si4+ sites. In the first Si4+ site, Si4+ is bonded to four N3- atoms to form corner-sharing SiN4 tetrahedra. There are a spread of Si–N bond distances ranging from 1.73–1.79 Å. In the second Si4+ site, Si4+ is bonded to four N3- atoms to form corner-sharing SiN4 tetrahedra. There are a spread of Si–N bond distances ranging from 1.70–1.77 Å. There are four inequivalent N3- sites. In the first N3- site, N3- is bonded in a trigonal planar geometry to one La3+ and three Si4+ atoms. In the second N3- site, N3- is bonded in a distorted rectangular see-saw-like geometry to two equivalent La3+ and two equivalent Si4+ atoms. In the third N3- site, N3- is bonded to two La3+ and two equivalent Si4+ atoms to form a mixture of distorted corner and edge-sharing NLa2Si2 trigonal pyramids. In the fourth N3- site, N3- is bonded in a 2-coordinate geometry to three La3+ and two Si4+ atoms.