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Neutron and high‐pressure X‐ray diffraction study of hydrogen‐bonded ferroelectric rubidium hydrogen sulfate
Author(s) -
Binns Jack,
McIntyre Garry J,
Parsons Simon
Publication year - 2016
Publication title -
acta crystallographica section b
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.604
H-Index - 33
ISSN - 2052-5206
DOI - 10.1107/s2052520616013494
Subject(s) - ferroelectricity , neutron diffraction , rubidium , hydrogen , diffraction , phase (matter) , phase transition , crystallography , hydrogen atom , materials science , x ray crystallography , dielectric , chemistry , crystal structure , condensed matter physics , optics , physics , group (periodic table) , optoelectronics , potassium , organic chemistry , metallurgy
The pressure‐ and temperature‐dependent phase transitions in the ferroelectric material rubidium hydrogen sulfate (RbHSO 4 ) 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 RbHSO 4 undergoes a ferroelectric transition before transforming to a third, high‐pressure phase. The symmetry of this phase is revised to the centrosymmetric space group P 2 1 / c , resulting in the suppression of ferroelectricity at high pressure.