Reentrant polar phase induced by the ferro-ionic coupling in Bi${}_{1-x}$Sm${}_x$FeO${}_3$ nanoparticles

Abstract

Using the model of four sublattices, the Landau-Ginzburg-Devonshire-Kittel phenomenological approach and the Stephenson-Highland ionic adsorption model for the description of coupled polar and antipolar long-range orders in ferroics, we calculated analytically the phase diagrams and polar properties of Bi${}_{1-x}$Sm${}_x$FeO${}_3$ nanoparticles covered by surface ions in dependence on their size, surface ions density, samarium content "x" and temperature. The size effects and ferro-ionic coupling govern the appearance and stability conditions of the long-range ordered ferroelectric, reentrant ferrielectric and antiferroelectric phases in the Bi1-xSmxFeO3 nanoparticles. Calculated phase diagrams are in a qualitative agreement with the X-ray diffraction phase analysis, electron paramagnetic resonance, infra-red spectroscopy and electrophysical measurements of the Bi${}_{1-x}$Sm${}_x$FeO${}_3$ nanopowders sintered by the solution combustion method. The combined theoretical-experimental approach allows to establish the influence of the ferro-ionic coupling and size effects in Bi${}_{1-x}$Sm${}_x$FeO${}_3$ nanoparticles on their polar properties.

53 pages, including 13 figures and 2 Appendixes, Revised version, Resubmitted to Physical Review B

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Cited by in corpus (1)

• Ferro-ionic States and Domains Morphology in Hf${}_x$Zr${}_{1-x}$O${}_2$ Nanoparticles