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Phase transitions in the superionic protonic conductor CsHSeO4 investigated by Brillouin spectroscopy |
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| Authors: | Y Luspin Y Vaills G Hauret |
| Affiliation: | a UFR Faculté des Sciences, Laboratoire d'Etudes Physiques des Matériaux, BP 6759, Université d'Orléans, 45067, Orléans Cedex 2, France b Centre de Recherches sur la Physique des Hautes Températures, CNRS, 45071, Orléans, France |
| Abstract: | A Brillouin investigation in CsHSeO4 has been performed over the temperature range 20–165 °C which includes two phase transitions, in particular the transition to the superionic phase near Ts = 129 °C. We observed strong discontinuities for elastic constants C11, C22 and C33 at Ts and a broadening of the Brillouin lines above Ts. The results are discussed on the basis of a linear coupling between strains and mobile protons. |
| Keywords: | Ionic conductivity-proton Brillouin scattering Cesium hydrogen selenate |
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