Unusual Phase Behavior in the Piezoelectric Perovskite System, LixNa1-xNbO3

Martin Peel, Sharon Elizabeth Ashbrook, Philip Lightfoot*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)
1 Downloads (Pure)


The system LixNa1-xNbO3has been studied by using a combination of X-ray and neutron powder diffraction and Na-23 solid-state NMR spectroscopy. For x = 0.05 we confirm a single polar orthorhombic phase. For 0.08 ≤ x ≤ 0.20 phase mixtures of this orthorhombic phase, together with a rhombohedral phase, isostructural with the low-temperature ferroelectric polymorph of NaNbO3, are observed. The relative fractions of these two phases are shown to be critically dependent on synthetic conditions: the rhombohedral phase is favored by higher annealing temperatures and rapid cooling. We also observe that the orthorhombic phase transforms slowly to the rhombohedral phase on standing in air at ambient temperature. For 0.25 ≤ x ≤ 0.90 two rhombohedral phases coexist, one Na-rich and the other Li-rich. In this region the phase behavior is independent of reaction conditions.

Original languageEnglish
Pages (from-to)8872-8880
Number of pages9
JournalInorganic Chemistry
Issue number15
Early online date16 Jul 2013
Publication statusPublished - 5 Aug 2013


  • Lead-free piezoceramics
  • Quantum MAS NMR
  • Lattice-parameters
  • Tilted octahedra
  • Lithium-niobate
  • Solid-solutions
  • NANBO3
  • Temperature
  • Diffraction
  • Transitions


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