Complex octahedral tilt phases in the ferroelectric perovskite system LixNa1xNbO3

Charlotte A. L. Dixon and Philip Lightfoot
Phys. Rev. B 97, 224105 – Published 21 June 2018
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Abstract

High-temperature phase behavior in the system LixNa1xNbO3 has been studied by using high-resolution neutron powder diffraction. Each of the three compositions studied in the Na-rich part of the phase diagram (viz., x=0.03,0.08, and 0.12) shows evidence for distinct and complex structural modulations based on different tilting schemes of NbO6 octahedral units. Whilst octahedral tilting is prevalent in the structural chemistry of perovskites the details of the long-range tilt phases are distinct from those previously observed in NaNbO3 itself. A phase with a well-defined fourfold superlattice is observed for the composition Li0.12Na0.88NbO3, and yet more complex phases with modulations based on 20-fold and 30-fold repeats are observed for Li0.03Na0.97NbO3 and Li0.08Na0.92NbO3, respectively. This peculiar structural frustration makes the system LixNa1xNbO3 a most structurally complex “simple” perovskite.

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  • Received 21 February 2018

DOI:https://doi.org/10.1103/PhysRevB.97.224105

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Charlotte A. L. Dixon and Philip Lightfoot*

  • School of Chemistry and EaStCHEM, University of St Andrews, St Andrews, KY16 9ST, United Kingdom

  • *pl@st-and.ac.uk

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Issue

Vol. 97, Iss. 22 — 1 June 2018

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