title: Polymorphism of Metallic Sodium under Nanoconfinement.
abstract: (23)Na NMR studies of sodium nanoparticles confined to porous glass with the 3.5 nm mean pore size were carried out. The emergence of the second component of the NMR line was observed below 240 K that evidences the occurrence of another modification of metallic sodium. The phase transition temperature is much higher than the martensite transformation temperature in bulk sodium.
authors.affiliation: Physics Department, St. Petersburg State University , St. Petersburg 198504, Russia.
authors.forename: A V
authors.initials: AV
authors.lastname: Uskov
authors.affiliation: Physics Department, St. Petersburg State University , St. Petersburg 198504, Russia.
authors.forename: D Yu
authors.initials: DY
authors.lastname: Nefedov
authors.affiliation: Physics Department, St. Petersburg State University , St. Petersburg 198504, Russia.
authors.forename: E V
authors.initials: EV
authors.lastname: Charnaya
authors.affiliation: Faculty of Physics and Geophysics, Leipzig University , Leipzig D-04103, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Haase
authors.affiliation: Faculty of Physics and Geophysics, Leipzig University , Leipzig D-04103, Germany.
authors.forename: D
authors.initials: D
authors.lastname: Michel
authors.affiliation: A.F. Ioffe Physico-Technical Institute RAS , St. Petersburg 194021, Russia.
authors.forename: Yu A
authors.initials: YA
authors.lastname: Kumzerov
authors.affiliation: A.F. Ioffe Physico-Technical Institute RAS , St. Petersburg 194021, Russia.
authors.forename: A V
authors.initials: AV
authors.lastname: Fokin
authors.affiliation: Moscow Institute of Physics and Technology , Moscow 141700, Russia.
authors.forename: A S
authors.initials: AS
authors.lastname: Bugaev
keywords: Knight shift; Sodium nanoparticles; nanoconfinement; polymorphism; porous glass