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- Title
New superprotonic crystals with dynamically disordered hydrogen bonds: cation replacements as the alternative to temperature increase.
- Authors
Selezneva, Elena V.; Makarova, Irina P.; Malyshkina, Inna A.; Gavrilova, Nadezhda D.; Grebenev, Vadim V.; Novik, Vitalii K.; Komornikov, Vladimir A.
- Abstract
Investigations of new single crystals grown in the K3H(SO4)2-(NH4)3H(SO4)2-H2O system from solutions with different K:NH4 concentration ratios have been carried out. Based on the X-ray diffraction data, the atomic structure of the crystals was determined at room temperature taking H atoms into account. It has been determined that [K0.43(NH4)0.57]3H(SO4)2 crystals are trigonal at ambient conditions such as the superprotonic phase of (NH4)3H(SO4)2 at high temperature. A distribution of the K and N atoms in the crystal was modelled on the basis of the refined occupancies of K/N positions. Studies of dielectric properties over the temperature range 223-353 K revealed high values of conductivity of the crystals comparable with the conductivity of known superprotonic compounds at high temperatures, and an anomaly corresponding to a transition to the phase with low conductivity upon cooling.
- Subjects
HYDROGEN bonding; CATIONS; TEMPERATURE effect
- Publication
Acta Crystallographica Section B: Structural Science, Crystal Engineering & Materials, 2017, Vol 73, Issue 6, p1105
- ISSN
2052-5192
- Publication type
Article
- DOI
10.1107/S2052520617012847