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Temperature behavior of the protonic conductor K4LiH3(SO4)4
Authors:A. Haznar  A. Pietraszko
Affiliation:Institute of Low Temperature and Structure Research, Polish Academy of Science, ul. Okólna 2, P.O. Box 1410, 50-950 Wroc?aw 2, Poland
Abstract:The results of the X-ray structural study for the K4LiH3(SO4)4 single crystal are presented at a wide temperature range. The thermal expansion of the crystal using the X-ray dilatometry and the capacitance dilatometry from 8 to 500 K was carried out. The crystal structures data collection, solution and refinement at 125, 295, 443 and 480 K were performed. The K4LiH3(SO4)4 crystal has tetragonal symmetry with the P41 space group (Z=4) at room temperature as well as at the considered temperature range. The existence of a low-temperature, para-ferroelastic phase transition at about 120 K is excluded. The layered structure of the crystal reflects a cleavage plane parallel to (001) and an anisotropy of the protonic conductivity. The superionic high-temperature phase transition at TS=425 K is isostructural. Nevertheless, taking into account an increase of the SO4 tetrahedra libration above TS, a mechanism of the Grotthus type could be applied for the proton transport explanation.
Keywords:K4LiH3(SO4)4   Crystal structure   Phase transition   Thermal expansion   Protonic conductor   X-ray diffraction
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