Microstructural evolution in NaNbO3-based antiferroelectrics

Hanzheng Guo, Hiroyuki Shimizu, Clive A. Randall

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9 Scopus citations

Abstract

Our recent study found that CaZrO3 doping can effectively enhance the antiferroelectric P phase in NaNbO3 ceramics, leading to a double polarization hysteresis loop characteristic of a reversible antiferroelectric → ferroelectric phase transition [Shimizu et al., Dalton Trans. 44, 10763 (2015)]. Here, a thorough transmission electron microscope study was performed to illustrate the CaZrO3 doping-assisted antiferroelectricity stabilization. In parallel to the bright-field imaging and selected area electron diffraction from multiple zone axes, detailed dark-field imaging was utilized to determine the superlattice structural origins, from either oxygen octahedral tilting or antiparallel cation displacements. By analogy with Pb(Zr1- xTix)O3 and rare-earth doped BiFeO3 systems, the chemical substitutions are such as to an induced polar-to-antipolar transition that is consistent with a tolerance factor reduction. The resultant chemical pressure has a similar effect to the compressive hydrostatic pressure where the antiferroelectric state is favored over the ferroelectric state.

Original languageEnglish (US)
Article number174107
JournalJournal of Applied Physics
Volume118
Issue number17
DOIs
StatePublished - Nov 7 2015

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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