Open AccessДипольное упорядочение и ионная проводимость в NASICON-подобных структурах типа Na-=SUB=-3-=/SUB=-Cr-=SUB=-2-=/SUB=-(PO-=SUB=-4-=/SUB=-)-=SUB=-3-=/SUB=-
Author(s) -
A. S. Nogai,
A. S. Nogai,
С. Ю. Стефанович,
Ж.М. Солиходжа,
D. E. Uskenbaev
Publication year - 2018
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2018.01.45284.014
Subject(s) - ionic conductivity , crystal structure , dipole , conductivity , ionic bonding , materials science , crystallography , fast ion conductor , polarization (electrochemistry) , relaxation (psychology) , crystal (programming language) , chemistry , condensed matter physics , ion , physics , social psychology , psychology , organic chemistry , electrode , computer science , programming language , electrolyte
The aspects of structure, dipole ordering, and ionic conductivity of the Na_3Cr_2(PO_4)_3 crystal with the four polymorphic phases (α, α', β, and γ) have been investigated. The features of the α-Na_3Cr_2(PO_4)_3 crystal structure and its dipole ordering and relaxation polarization in the low-temperature α and α' phases have been refined. The occurrence of Na_3Cr_2(PO_4)_3 dipole ordering in the α and α' phases and high ionic conductivity in the β and γ phases is attributed to the structural changes in the rhombohedral [ Me _2(PO_4)_3]^–3_3∞ crystal frame upon phase transformations α → α', α' → β, and β → γ. A model for explaining the dipole ordering and ionic conductivity phenomena in Na_3Cr_2(PO_4)_3 is proposed.