Superionic State in Alumina Produced by Nonthermal Melting

0541069 - ÚFP 2021 RIV DE eng J - Článek v odborném periodiku
Voronkov, R. A. - Medvedev, Nikita - Volkov, A.E.
Superionic State in Alumina Produced by Nonthermal Melting.
Physica Status Solidi. Roč. 14, č. 3 (2020), s. 1-6, č. článku 1900641. ISSN 1862-6254. E-ISSN 1862-6270
Grant CEP: GA MŠMT LTT17015; GA MŠMT(CZ) LM2015083
Institucionální podpora: RVO:61389021
Klíčová slova: ab initio calculations * aluminum oxide * nonthermal melting * phase transitions * superionic states
Obor OECD: Optics (including laser optics and quantum optics)
Impakt faktor: 2.821, rok: 2020
Způsob publikování: Omezený přístup
https://onlinelibrary.wiley.com/doi/abs/10.1002/pssr.201900641

Density functional–based molecular dynamics reveals a transient superionic state in Al2O3 produced by nonthermal phase transition under extreme electronic excitation. At electronic temperatures above Te ≈ 2.75 eV, the oxygen sublattice exhibits fluid behavior, whereas the aluminum sublattice is in a solid state. This state exists up to Te ≈ 3.25 eV, where Al2O3 turns metallic–superionic, at Te ≈ 3.75 eV, the aluminum sublattice disorders. Quenching the superionic state under pressure >400 GPa freezes it into a metastable mixed amorphous–crystalline phase where the oxygen subsystem is disordered solid, whereas the aluminum one is ordered.
Trvalý link: http://hdl.handle.net/11104/0318649