Electronic ferroelectricity, charge ordering and structural phase transitions in LuFe2O4(LuFeO3)n (n=0 and 1)

The nature of the charge order, multiferroic features, and structural phase transitions in LuFe2O4(LuFeO3)(n) (n = 0 amd 1) materials have been extensively investigated. In situ transmission electron microscopy(TEM) investigations on LuFe2O4 (n = 0) show the presence of well-defined charge-ordered states at low temperatures that could give rise to a notable ferroelectric polarization. Measurements of the structural and physcial properties on LuFe2O4(LuFeO3)(n) (n =1) demonstrate that the interealation of the LuFeO3-block could lead to visible changes in the dielectric properties and the charge ordering (CO) features, Measurements of ferroelectric properties suggest that Mn substitution for Fe in Lu2Fe2Fe1-xMnx (0 < x < 0.86) can notably suppress the conducting leakage current and results in clear hysteresis loops in the polarization-electric field switching curves.