Journal
NEW JOURNAL OF CHEMISTRY
Volume 44, Issue 22, Pages 9264-9270Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0nj02428g
Keywords
-
Categories
Funding
- TGIR-RMN-THC Fr3050 CNRS
- Slovak Research and Development Agency [APVV-15-0479]
- Scientific Grant Agency of the Ministry of Education of the Slovak Republic
- Slovak Academy of Sciences [Vega 2/0024/20]
Ask authors/readers for more resources
A metastable phase K18Ta5Zr5F63 was prepared by molten salt synthesis of K2TaF7 and K2ZrF6 in a sealed Pt crucible. This is the first example of a structure of a fluoride complex compound containing both tantalum and zirconium as central atoms. The asymmetric part of the unit cell contains two Ta/Zr sites and one pure Zr site. The Ta1/Zr1 ion is coordinated by seven F ions forming one capped trigonal prism. The Ta2/Zr2 ion is coordinated by six F ions forming a trigonal prism, and this polyhedron is fully ordered. The Zr3 ion is coordinated by six F ions, which are disordered over two positions. All (Zr/Ta)F-n (n = 6-8) polyhedra are isolated from each other, although the ZrF6 units have shared faces, forming an infinite channel along the c-axis. F-19 MAS NMR experiments agree with the proposed structural model, identifying all five central non-equivalent polyhedra. The K18Ta5Zr5F63 phase decomposes within several months to its initial components; this can be monitored by NMR, DSC and XRD experiments. Moreover, accelerated decomposition can be achieved by thermal treatment, resulting in the formation of a K3ZrF7 phase.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available