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Phase transitions and electrical properties of CsH(SO4)0.76(SeO4)0.24 mixed crystals |
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| Authors: | M. Gargouri, T. Mhiri, M. Bouachir, J. M. R au, J. S n gas,A. Daoud |
| Affiliation: | a Laboratoire de l'Etat Solide, Université de Sfax, 3038, Sfax, Tunisia b Laboratoire de Chimie du Solide du CNRS, ICMCB, avenue A. Schweitzer, 33600, Pessac, Bordeaux, France |
| Abstract: | The study by X-ray diffraction, calorimetry, vibrational and impedance spectroscopy of CsH(SO4)0.76(SeO4)0.24 new solid solution is presented. Crystals of this composition undergo two phase transitions at T = 333 and 408 K. The last one at 408 K is a superionic-protonic transition (SPT) related to a rapid [HS(Se)O4−] reorientation and fast H+ diffusion. A sudden jump in the conductivity plot confirms the presence of this transition. Above 408 K, this high temperature phase is characterized by high electrical conductivity (7 × 10t-3 Ω− cm−1) and low activation energy (Ea < 0.3 eV). |
| Keywords: | Mixed crystal Phase transition Proton conductors |
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