Investigation of the hydrothermal crystallisation of the perovskite solid solution NaCe1-xLaxTi2O6 and its defect chemistry

Mohammad H. Harunsani, David I. Woodward, Martin Peel, Sharon Elizabeth Ashbrook, Richard I. Walton*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Perovskites of nominal composition NaCe1−xLaxTi2O6 (0≤x≤1) crystallise directly under hydrothermal conditions at 240 °C. Raman spectroscopy shows distortion from the ideal cubic structure and Rietveld analysis of powder X-ray and neutron diffraction reveals that the materials represent a continuous series in rhombohedral space group Rc. Ce LIII-edge X-ray absorption near edge structure spectroscopy shows that while the majority of cerium is present as Ce3+ there is evidence for Ce4+. The paramagnetic Ce3+ affects the chemical shift and line width of 23Na MAS NMR spectra, which also show with no evidence for A-site ordering. 2H MAS NMR of samples prepared in D2O shows the inclusion of deuterium, which IR spectroscopy shows is most likely to be as D2O. The deuterium content is highest for the cerium-rich materials, consistent with oxidation of some cerium to Ce4+ to provide charge balance of A-site water.

Original languageEnglish
Pages (from-to)117-125
Number of pages9
JournalJournal of Solid State Chemistry
Volume207
Early online date20 Sept 2013
DOIs
Publication statusPublished - Nov 2013

Keywords

  • Perovskite
  • Hydrothermal
  • XANES
  • NMR
  • Neutron diffraction
  • Free piezoelectric ceramics
  • Low-temperature
  • X-ray
  • Oxidation-state
  • Barium-titanate
  • Thin-films
  • LA1/2NA1/2TIO3 NANOCRYSTALS
  • Quantum paraelectricity
  • Raman-spectroscopy
  • BATIO3

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