Materials Data on CaMgAsO4F by Materials Project
CaMgAsO4F crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Ca2+ is bonded in a 7-coordinate geometry to six O2- and one F1- atom. There are a spread of Ca–O bond distances ranging from 2.45–2.68 Å. The Ca–F bond length is 2.26 Å. Mg2+ is bonded to four O2- and two equivalent F1- atoms to form MgO4F2 octahedra that share corners with two equivalent MgO4F2 octahedra and corners with four equivalent AsO4 tetrahedra. The corner-sharing octahedral tilt angles are 45°. There are two shorter (2.10 Å) and two longer (2.14 Å) Mg–O bond lengths. Both Mg–F bond lengths are 1.95 Å. As5+ is bonded to four O2- atoms to form AsO4 tetrahedra that share corners with four equivalent MgO4F2 octahedra. The corner-sharing octahedra tilt angles range from 44–56°. There is two shorter (1.72 Å) and two longer (1.73 Å) As–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to one Ca2+, one Mg2+, and one As5+ atom. In the second O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Ca2+, one Mg2+, and one As5+ atom. F1- is bonded in a distorted trigonal planar geometry to one Ca2+ and two equivalent Mg2+ atoms.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). LBNL Materials Project
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Contributing Organization:
- MIT; UC Berkeley; Duke; U Louvain
- DOE Contract Number:
- AC02-05CH11231; EDCBEE
- OSTI ID:
- 1285635
- Report Number(s):
- mp-7035
- Resource Relation:
- Related Information: https://materialsproject.org/citing
- Country of Publication:
- United States
- Language:
- English
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