Superionic phase transition in CsHSeO₄and CsDSeO₄single crystal

Abstract

Deuterization of CsHSeO does not affect of the superionic phase transition but itcreases the activation energy in the superionic phase.

Dielectric relaxation of CsHSeO4 above room temperature

“…The CsHSeO 4 is a solid electrolyte that exhibits a superionic protonic conduction behavior above T c = 401 K [4][5][6][7]. The first order phase transition is accompanied by a strong conductivity increase, by four orders of magnitude, which essentially originates from proton diffusion [8][9][10][11].…”

Superionic Phase Transition in Rb4LiH3(SeO4)4Single Crystals

“…The conductivity jump at Ts in a simple selenate CsHSeO4 was of about four orders of magnitude, and a small activation energy Wa = Wb = Wc = 0.10 eV was obtained in the superionic phase [18]. The Me3H(SeO4)2 family exhibits a conductivity jump of about one order of magnitude at Ts , with activation energies Wa = Wb = 0.26-0.39 eV in the high conducting phase, depending on the crystal [16,17,[20][21][22].…”

“…Many crystals of various hydrogen sulphates and selenates were found to exhibit protonic conduction and superionic phase transition [10][11][12][13][14][15][16][17][18][19][20][21][22][23], however, the conductivity changes at the phase transition temperature T$ and the activation energies in the superionic phase are very different. The conductivity jump at Ts in a simple selenate CsHSeO4 was of about four orders of magnitude, and a small activation energy Wa = Wb = Wc = 0.10 eV was obtained in the superionic phase [18].…”

Enabling Superprotonic Phase Transitions in Solid Acids via Supramolecular Complex Formation: The Case of Crown Ethers and Alkali Hydrogen Sulfates

“…The supramolecular complex salt of 18-crown-6• KHSO 4 (1) was prepared according to the literature 49 and its structure was redetermined, whereas 18-crown-6 (2) at RT and −170 °C were collected on an Oxford X'Calibur S CCD diffractometer equipped with a graphite monochromator (Mo Kα radiation, λ = 0.71073 Å) and an Oxford CryoStream800 cryostat. In each case, crystals showed twinning, and the reflection data were integrated with the default configuration for twinned crystals with the CrysAlisPro Software.…”

“…43,47−49 It has also been pointed out that the cation that is selectively captured in the crown ethers' cavities has an explicit effect on the dynamics of these complexes. 56,57 The anhydrous supramolecular complex made up of 18-crown-6 and potassium hydrogen sulfate, 18-crown-6•KHSO 4 (1), was reported to undergo an enantiotropic solid−solid transition, which was believed, but never proved, to be associated with the onset of a dynamical process affecting the crown ether ligand and/or the hydrogen sulfate anion. 49 After almost 20 years, we finally gave insights into the genuine nature of such a transition, which leads to a superprotonic phase.…”