We report a study of the structural phase transitions induced by pressure in bulk black phosphorus by using both synchrotron x-ray diffraction for pressures up to 12.2 GPa and Raman spectroscopy up to 18.2 GPa. Very recently black phosphorus attracted large attention because of the unique properties of few-layers samples (phosphorene), but some basic questions are still open in the case of the bulk system. As concerning the presence of a Raman spectrum above 10 GPa, which should not be observed in an elemental simple cubic system, we propose a new explanation by attributing a key role to the non-hydrostatic conditions occurring in Raman experiments. Finally, a combined analysis of Raman and XRD data allowed us to obtain quantitative information on presence and extent of coexistences between different structural phases from ~5 up to ~15 GPa. This information can have an important role in theoretical studies on pressure-induced structural and electronic phase transitions in black phosphorus.
Coexistence of pressure-induced structural phases in bulk black phosphorus: a combined x-ray diffraction and Raman study up to 18 GPa / B. Joseph, S. Caramazza, F. Capitani, T. Clarté, F. Ripanti, P. Lotti, A. Lausi, D. Di Castro, P. Postorino, P. Dore. - In: JOURNAL OF PHYSICS. CONDENSED MATTER. - ISSN 0953-8984. - 30:49(2018 Dec 12).
|Titolo:||Coexistence of pressure-induced structural phases in bulk black phosphorus: a combined x-ray diffraction and Raman study up to 18 GPa|
|Parole Chiave:||black phosphorus; high pressure; phase transitions; Raman spectroscopy; x-ray diffraction|
|Settore Scientifico Disciplinare:||Settore GEO/09 - Georisorse Miner.Appl.Mineral.-Petrogr.per l'amb.e i Beni Cul|
Settore FIS/01 - Fisica Sperimentale
|Data di pubblicazione:||12-dic-2018|
|Data ahead of print / Data di stampa:||19-nov-2018|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1088/1361-648X/aaebe5|
|Appare nelle tipologie:||01 - Articolo su periodico|