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NASA NTRS1988

Crystallization of BaF2-ZnF2-YbF3-ThF4 glass

The phases and the rates of crystallization in a Ba-Zn-Yb-Th fluoride glass were studied using differential scanning calorimetry, XRD, and observational and chemical SEM analyses. The crystallizing phases that were identified included a BaYbTh fluoride, ZnF2, and YbF3. The BaYbTh fluoride crystallized first at about 450 C, and ZnF2, which was excluded from this phase, crystallized at its surfaces. At higher temperatures, the BaYbTh fluoride phase decomposed partially to BaThF6 and YbF3 phases.

Garcia, Roberto↗

DOE OSTI2020

Materials Data on YbF3 by Materials Project

YbF3 is Cementite structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Yb3+ is bonded in a 9-coordinate geometry to nine F1- atoms. There are a spread of Yb–F bond distances ranging from 2.28–2.40 Å. There are two inequivalent F1- sites. In the first F1- site, F1- is bonded in a 3-coordinate geometry to three equivalent Yb3+ atoms. In the second F1- site, F1- is bonded in a distorted trigonal planar geometry to three equivalent Yb3+ atoms.

36 MATERIALS SCIENCE↗