Structural coherence and ferroelectricity decay in submicron- and nano-sized perovskites

V. Petkov, V. Buscaglia, M. T. Buscaglia, Z. Zhao, Y. Ren

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66 Scopus citations

Abstract

Understanding the loss of ferroelectricity in submicron- and nano-sized perovskites is an issue that has been debated for decades. Here we report results from a high-energy x-ray diffraction (XRD) study on a prime example of the perovskite's family, BaTiO3 ceramics with a grain size ranging from 1200 to 5 nm. We find that the loss of ferroelectricity in submicron- and nano-sized BaTiO3 has an intrinsic origin related to the increased atomic positional disorder in spatially confined physical systems. Our results imply that no particular critical size at which ferroelectricity in BaTiO3, in particular, and perovskites, in general, is completely lost exists. Rather it weakens exponentially with the decreasing of their physical size. Smart technological solutions are needed to bring it back.

Original languageEnglish
Article number054107
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume78
Issue number5
DOIs
StatePublished - Aug 11 2008

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