bei Google ScholarTitelangaben
Parakhonskiy, Gleb ; Dubrovinskaia, Natalia ; Bykova, Elena ; Wirth, Richard ; Dubrovinsky, Leonid:
High pressure synthesis and investigation of single crystals of metastable boron phases.
In: High Pressure Research.
Bd. 33
(2013)
Heft 3
.
- S. 673-683.
ISSN 1477-2299
DOI: https://doi.org/10.1080/08957959.2013.806500
Abstract
In the present work we have confirmed the existence of the tetragonal boron phase T-50 that was disputed for more than a half of a century. This phase was reproducibly synthesized at high pressures and high temperatures (HPHT) in the form of single crystals and its structure was refined based on single-crystal synchrotron X-ray diffraction data. We also present here a previously unknown rhombohedral boron phase synthesized in a limited HPHT field. Its structure was solved based on in house single-crystal X-ray diffraction data and found to be similar to that of boron carbide. After hitherto known stable α-B, β-B, and γ-B polymorphs, T-50 and the newly obtained rhombohedral boron phases were designated in the present work as δ-B and ϵ-B, correspondingly. From the experimental evidences, both the phases are considered as metastable.