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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on KBe3ZnF9 by Materials Project

KBe3ZnF9 crystallizes in the hexagonal P-6c2 space group. The structure is three-dimensional. K1+ is bonded in a 6-coordinate geometry to six equivalent F1- atoms. All K–F bond lengths are 2.77 Å. Be2+ is bonded to four F1- atoms to form BeF4 tetrahedra that share corners with two equivalent ZnF6 octahedra and corners with two equivalent BeF4 tetrahedra. The corner-sharing octahedral tilt angles are 43°. There are a spread of Be–F bond distances ranging from 1.55–1.60 Å. Zn2+ is bonded to six equivalent F1- atoms to form ZnF6 octahedra that share corners with six equivalent BeF4 tetrahedra. All Zn–F bond lengths are 2.06 Å. There are two inequivalent F1- sites. In the first F1- site, F1- is bonded in a 1-coordinate geometry to one K1+, one Be2+, and one Zn2+ atom. In the second F1- site, F1- is bonded in a distorted bent 120 degrees geometry to two equivalent Be2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K2Be3Zn2F12 by Materials Project

K2Be3Zn2F12 crystallizes in the cubic P2_13 space group. The structure is three-dimensional. there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 12-coordinate geometry to twelve F1- atoms. There are a spread of K–F bond distances ranging from 2.92–3.26 Å. In the second K1+ site, K1+ is bonded in a 9-coordinate geometry to nine F1- atoms. There are a spread of K–F bond distances ranging from 2.82–3.23 Å. Be2+ is bonded to four F1- atoms to form BeF4 tetrahedra that share corners with four ZnF6 octahedra. The corner-sharing octahedra tilt angles range from 18–52°. There are a spread of Be–F bond distances ranging from 1.55–1.57 Å. There are two inequivalent Zn2+ sites. In the first Zn2+ site, Zn2+ is bonded to six F1- atoms to form ZnF6 octahedra that share corners with six equivalent BeF4 tetrahedra. There are three shorter (2.04 Å) and three longer (2.06 Å) Zn–F bond lengths. In the second Zn2+ site, Zn2+ is bonded to six F1- atoms to form ZnF6 octahedra that share corners with six equivalent BeF4 tetrahedra. There are three shorter (2.06 Å) and three longer (2.08 Å) Zn–F bond lengths. There are four inequivalent F1- sites. In the first F1- site, F1- is bonded in a 2-coordinate geometry to two K1+, one Be2+, and one Zn2+ atom. In the second F1- site, F1- is bonded in a distorted bent 150 degrees geometry to three K1+, one Be2+, and one Zn2+ atom. In the third F1- site, F1- is bonded in a 2-coordinate geometry to one K1+, one Be2+, and one Zn2+ atom. In the fourth F1- site, F1- is bonded in a 3-coordinate geometry to one K1+, one Be2+, and one Zn2+ atom.

36 MATERIALS SCIENCE↗