Materials Data on Mn2Si(H2O3)2 by Materials Project
Mn2Si(H2O3)2 crystallizes in the orthorhombic Pca2_1 space group. The structure is three-dimensional. there are two inequivalent Mn2+ sites. In the first Mn2+ site, Mn2+ is bonded to six O2- atoms to form MnO6 octahedra that share a cornercorner with one MnO6 octahedra, corners with two equivalent SiO4 tetrahedra, and edges with five MnO6 octahedra. The corner-sharing octahedral tilt angles are 55°. There are a spread of Mn–O bond distances ranging from 2.15–2.29 Å. In the second Mn2+ site, Mn2+ is bonded to six O2- atoms to form distorted MnO6 octahedra that share corners with three MnO6 octahedra, corners with two equivalent SiO4 tetrahedra, and edges with three equivalent MnO6 octahedra. The corner-sharing octahedra tilt angles range from 55–56°. There are a spread of Mn–O bond distances ranging from 2.14–2.41 Å. Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with four MnO6 octahedra and corners with two equivalent SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 57–62°. There is two shorter (1.63 Å) and two longer (1.69 Å) Si–O bond length. There are four inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.97 Å. In the second H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.98 Å. In the third H1+ site, H1+ is bonded in a linear geometry to two O2- atoms. There is one shorter (1.03 Å) and one longer (1.59 Å) H–O bond length. In the fourth H1+ site, H1+ is bonded in a distorted single-bond geometry to two O2- atoms. There is one shorter (1.01 Å) and one longer (1.69 Å) H–O bond length. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to three Mn2+ and one H1+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to three Mn2+ and one H1+ atom. In the third O2- site, O2- is bonded in a distorted water-like geometry to two Mn2+ and two H1+ atoms. In the fourth O2- site, O2- is bonded in a distorted tetrahedral geometry to one Mn2+, one Si4+, and two H1+ atoms. In the fifth O2- site, O2- is bonded in a bent 150 degrees geometry to two equivalent Si4+ atoms. In the sixth O2- site, O2- is bonded in a 4-coordinate geometry to three Mn2+ and one Si4+ atom.