DOE OSTI2020
ZrO2 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are three inequivalent Zr4+ sites. In the first Zr4+ site, Zr4+ is bonded to six O2- atoms to form a mixture of distorted corner and edge-sharing ZrO6 octahedra. The corner-sharing octahedral tilt angles are 25°. There are a spread of Zr–O bond distances ranging from 2.07–2.19 Å. In the second Zr4+ site, Zr4+ is bonded to six O2- atoms to form a mixture of distorted corner and edge-sharing ZrO6 octahedra. The corner-sharing octahedra tilt angles range from 24–25°. There are a spread of Zr–O bond distances ranging from 2.07–2.19 Å. In the third Zr4+ site, Zr4+ is bonded to six O2- atoms to form a mixture of corner and edge-sharing ZrO6 octahedra. The corner-sharing octahedra tilt angles range from 24–25°. There are two shorter (2.11 Å) and four longer (2.13 Å) Zr–O bond lengths. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a trigonal non-coplanar geometry to three Zr4+ atoms. In the second O2- site, O2- is bonded in a distorted T-shaped geometry to three Zr4+ atoms. In the third O2- site, O2- is bonded in a distorted T-shaped geometry to three Zr4+ atoms. In the fourth O2- site, O2- is bonded in a distorted T-shaped geometry to three Zr4+ atoms. In the fifth O2- site, O2- is bonded in a distorted T-shaped geometry to three Zr4+ atoms. In the sixth O2- site, O2- is bonded in a trigonal non-coplanar geometry to three Zr4+ atoms.