Materials Data on La2HgO4 by Materials Project
La2HgO4 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are two inequivalent La3+ sites. In the first La3+ site, La3+ is bonded to seven O2- atoms to form distorted edge-sharing LaO7 hexagonal pyramids. There are a spread of La–O bond distances ranging from 2.39–2.60 Å. In the second La3+ site, La3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of La–O bond distances ranging from 2.38–2.65 Å. Hg2+ is bonded in a distorted linear geometry to four O2- atoms. There are two shorter (2.02 Å) and two longer (3.04 Å) Hg–O bond lengths. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 6-coordinate geometry to four La3+ and two equivalent Hg2+ atoms. In the second O2- site, O2- is bonded to three equivalent La3+ and one Hg2+ atom to form a mixture of distorted edge and corner-sharing OLa3Hg tetrahedra. In the third O2- site, O2- is bonded to three La3+ and one Hg2+ atom to form distorted OLa3Hg tetrahedra that share corners with eight OLa3Hg tetrahedra and edges with two equivalent OLa4 tetrahedra. In the fourth O2- site, O2- is bonded to four La3+ atoms to form a mixture of edge and corner-sharing OLa4 tetrahedra.