Neutron and high-pressure X-ray diffraction study of hydrogen-bonded ferroelectric rubidium hydrogen sulfate

Jack Binns*, Garry J. McIntyre, Simon Parsons

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The pressure-and temperature-dependent phase transitions in the ferroelectric material rubidium hydrogen sulfate (RbHSO4) are investigated by a combination of neutron Laue diffraction and high-pressure X-ray diffraction. The observation of disordered O-atom positions in the hydrogen sulfate anions is in agreement with previous spectroscopic measurements in the literature. Contrary to the mechanism observed in other hydrogen-bonded ferroelectric materials, H-atom positions are well defined and ordered in the paraelectric phase. Under applied pressure RbHSO4 undergoes a ferroelectric transition before transforming to a third, high-pressure phase. The symmetry of this phase is revised to the centrosymmetric space group P2(1)/c, resulting in the suppression of ferroelectricity at high pressure.

Original languageEnglish
Pages (from-to)855-863
Number of pages9
JournalActa Crystallographica Section B: Structural Science, Crystal Engineering and Materials
Volume72
Early online date1 Dec 2016
DOIs
Publication statusE-pub ahead of print - 1 Dec 2016

Keywords

  • ferroelectric
  • neutron diffraction
  • phase transitions
  • PARA-ELECTRIC PHASE
  • CRYSTAL-STRUCTURES
  • LAUE DIFFRACTION
  • PARAELECTRIC PHASE
  • RBHSO4
  • REFLECTIONS
  • TRANSITIONS
  • RBHSEO4
  • INTEGRATION
  • REFINEMENT

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