Quenchable amorphous glass-like material from VF3
- 10 February 2021
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Dalton Transactions
- Vol. 50 (8), 3005-3010
- https://doi.org/10.1039/d1dt00033k
Abstract
The quite simple but relatively stable VF3-type compounds are known to be of major interest due to their building blocks – octahedra that are extremely important in perovskites as well. Here, we show that the VF6 octahedron in VF3 varies over a fairly wide pressure range (0–50 GPa), maintaining undisturbed rhombohedral crystal symmetry. Half of this pressure, VF6 rotates easily while the other undergoes strong uniaxial deformation in a “super-dense” condition. The congested sphere packing ultimately does not endure and drives the material to amorphize. We observed that the amorphous state could be quenched and acquire a transparent glass-like appearance when unloaded to ambient conditions. Dramatic, pressure-induced changes are clarified by phonon dispersion curves with the imaginary phonon mode, the so-called phonon soft mode, which indicates the structural instability. The distortion of the VF6 octahedra is attributed to the distinctive amorphization that could be further searched for throughout the whole almost identical VF3-type series providing metal trifluorides of various amorphous species.Funding Information
- National Key Research and Development Program of China (2018YFA0305703)
- Science Challenge Project (TZ2016001)
- National Natural Science Foundation of China (U1930401, 11874075)
- National Research Foundation of Korea (NRF-2019R1F1A1052026)
- Korea Institute of Science and Technology Information (KSC-2019-CRE-0172)
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