Relationships between structural and electric properties of pure and mixed protonic conductors
Abstract The structural characterisation of Hydrogen Uranyl Phosphate (HUP) samples has been performed using both the powder X-ray diffraction and thermogravimetry techniques. The structural behaviour has been studied using either ageing or different drying process (temperature, vacuum, drying agents,…). Four main states of dehydration have been identified and the corresponding crystal cells are proposed. Parallel, X-ray and neutron diffraction as well as thermogravimetric analysis have been used in order to precise the location of protons in the pyrochlore-structured compound HSbTeO 6 ·H 2 O. At the light of complementary properties, thermogravimetric and impedance spectroscopy have been performed on mixtures of the hereabove electrolytes. The measurements evidence a good ability of the mixtures to conciliate both a large level of conductivity and a rather fast reversibility of charge and discharge.