Abstract
The mixed caesium rubidium dihydrogen phosphate, Cs 0.4Rb 0.6H 2PO 4 (CRDP) crystallises in the monoclinic system P2 1/m at room temperature with the following parameters: a=4.8183(9); b=6.2671(6); c=7.7620(10) A ̊ and β=108.26°(10); Z=2. A calorimetric study of the title compound shows two distinct endothermal peaks which are detected at 293 and 525 K. Samples were examined by impedance and modulus spectroscopy techniques. The first transition (293 K) is attributed to a ferroelectric–paraelectric type. A high temperature phase transition (525 K) leading to a superionic–protonic phase was found, characterised by an unusual high conductivity. The conductivity relaxation parameters associated with the high-disorder protonic conduction have been determined from analysis of the M″/ M″ max spectrum measured in a wide temperature range. Transport properties in this material appear to be due to proton hopping mechanism.
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