Materials Data on ZrAs2O9 by Materials Project
ZrAs2O9 crystallizes in the monoclinic P2_1/c space group. The structure is two-dimensional and consists of two ZrAs2O9 sheets oriented in the (0, 0, 1) direction. Zr is bonded to six O atoms to form ZrO6 octahedra that share corners with three equivalent AsO4 tetrahedra and corners with three equivalent AsO4 trigonal pyramids. There are a spread of Zr–O bond distances ranging from 2.00–2.27 Å. There are two inequivalent As sites. In the first As site, As is bonded to four O atoms to form AsO4 trigonal pyramids that share corners with three equivalent ZrO6 octahedra. The corner-sharing octahedra tilt angles range from 29–54°. There are a spread of As–O bond distances ranging from 1.67–2.20 Å. In the second As site, As is bonded to four O atoms to form AsO4 tetrahedra that share corners with three equivalent ZrO6 octahedra. The corner-sharing octahedra tilt angles range from 31–38°. There are a spread of As–O bond distances ranging from 1.66–1.75 Å. There are nine inequivalent O sites. In the first O site, O is bonded in a bent 150 degrees geometry to one Zr and one As atom. In the second O site, O is bonded in a single-bond geometry to one As atom. In the third O site, O is bonded in a bent 150 degrees geometry to one Zr and one As atom. In the fourth O site, O is bonded in a bent 150 degrees geometry to one Zr and one As atom. In the fifth O site, O is bonded in a single-bond geometry to one O atom. The O–O bond length is 1.25 Å. In the sixth O site, O is bonded in a bent 120 degrees geometry to one Zr and one As atom. In the seventh O site, O is bonded in a distorted bent 150 degrees geometry to one Zr and one As atom. In the eighth O site, O is bonded in a bent 120 degrees geometry to one As and one O atom. In the ninth O site, O is bonded in a bent 150 degrees geometry to one Zr and one As atom.